2022/08/02 更新

写真a

マ テイレイ
馬 廷麗
MA Tingli
Scopus 論文情報  
総論文数: 0  総Citation: 0  h-index: 60

Citation Countは当該年に発表した論文の被引用数

所属
大学院生命体工学研究科 生体機能専攻
職名
教授
メールアドレス
メールアドレス
研究室電話
093-695-6045
外部リンク

研究キーワード

  • 有機/無機ナノ機能材料およびデバイスへの応用

研究分野

  • ナノテク・材料 / ナノ材料科学

  • ナノテク・材料 / エネルギー化学

  • ものづくり技術(機械・電気電子・化学工学) / 電子デバイス、電子機器

出身学校

  • 1984年07月   遼寧師範大学   理学部   化学専攻   卒業   中華人民共和国

出身大学院

  • 1999年03月   九州大学   理学府   凝縮系科学専攻集合系   博士課程・博士後期課程   修了   日本国

取得学位

  • 九州大学  -  博士(理学)   1999年03月

学内職務経歴

  • 2014年04月 - 現在   九州工業大学   大学院生命体工学研究科   生体機能専攻     教授

  • 2013年04月 - 2014年03月   九州工業大学   大学院生命体工学研究科   生体機能専攻     教授

学外略歴

  • 2007年04月 - 2013年03月   大連理工大学   精細化工国家重点実験室   教授   中華人民共和国

  • 2004年06月 - 2007年03月   九州大学   高等教育研究開発センター   助教授   日本国

所属学会・委員会

  • 2013年04月 - 現在   電気化学会   日本国

  • 2013年04月 - 現在   応用物理学会   日本国

  • 2012年01月 - 現在   日本化学会   日本国

  • 2012年01月 - 現在   中国化学会会員   中華人民共和国

  • 2012年01月 - 2019年03月   日本光化学協会   日本国

  • 2012年01月 - 2018年12月   中国機能材料学会   中華人民共和国

  • 2012年01月 - 2012年12月   中国エネルギー学会   中華人民共和国

  • 2011年07月 - 現在   中国太陽電池学会 遼寧支部   中華人民共和国

  • 2009年09月 - 2013年04月   中国測定学会   中華人民共和国

  • 2009年09月 - 2013年04月   中国計測学会   中華人民共和国

▼全件表示

研究経歴

  • 触媒材料開発及び燃料電池への応用

    ナノ材料、燃料電池

    研究期間: 2015年04月  -  2018年01月

     詳細を見る

    Ptフリなどのナノ材料を開発し、燃料電池へ応用する

  • ナノ機能材料開発

    ナノ材料

    研究期間: 2013年04月  -  現在

  • 次世代太陽電池の開発

    太陽電池

    研究期間: 1999年01月  -  現在

  • 32員環大環状配位子及びその希土類金属錯体の合成と物性 についての研究

    32員環大環状配位子及びその希土類金属錯体の合成と物性 についての研究

    研究期間: 1994年04月  -  1996年03月

  • 大環状配位子及びその遷移金属錯体の合成と物性についての研究

    大環状配位子及びその遷移金属錯体の合成と物性についての研究

    研究期間: 1994年04月  -  1996年03月

  • カテコールを含む配位子の合成及び物性についての研究

    カテコールを含む配位子の合成及び物性についての研究

    研究期間: 1993年04月  -  1994年03月

▼全件表示

論文

  • Integrating a three-dimensional Cu<inf>2</inf>MoS<inf>4</inf> electrode and solid-state polymer electrolyte for sodium-ion batteries 査読有り 国際誌

    Zhao Y., Meng X., Kang Q., Yan L., Ye X., Zhang J., Liu H., Han Q., Chen Y., Ma T.

    Chemical Engineering Journal   450   2022年12月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The improvement of solid-state batteries (SSBs) in terms of safety performance and energy density has an unusual significance for it to apply to power batteries, and the interface matching of solid-state electrolytes and adapted electrode materials has become the key. Due to poor electrode-electrolyte interface contact in SSBs which could result in low ionic conductivity, we designed a 3D integrated electrode constructed from a Cu2MoS4 electrode grown in situ on the surface of copper foam with a polymer-in-salt solid electrolyte based on PVDF-HFP. The ion clusters formed by NaPF6 near the PVDF-HFP network structure can effectively shorten the Na+ transport path, and then adding 1-(4-cyanophenyl)-guanidine can also provide more ion transport routes by forming coordination bonds. The polymer electrolyte exhibited excellent ionic conductivity (1.67×10−5 S cm−1 at room temperature) and electrochemical stability (5.6 V vs Na|Na+). At the same time, it showed excellent stability during the cycle performance test of the symmetrical batteries, compared with the liquid electrolytes, the polymer-in-salt solid electrolytes were not short circuit under the same test conditions, indicating that the polymer-in-salt solid electrolytes can effectively inhibit the growth of Na dendrites. This 3D integrated electrode exhibited excellent interface-contact compatibility, mechanical stability, and electrochemical performance closed to that of liquid electrolytes and even outperformed liquid electrolytes at a high rate cycle.

    DOI: 10.1016/j.cej.2022.137903

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  • Multiple health indicators assisting data-driven prediction of the later service life for lithium-ion batteries 査読有り 国際誌

    Jiang H., Wang H., Su Y., Kang Q., Meng X., Yan L., Ma T.

    Journal of Power Sources   542   2022年09月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Data-driven method is an efficient tool for diagnostics and prognostics of lithium-ion batteries during their manufacturing and service period. Accurately predicting the later service life of batteries is a meaningful task. Still, it remains a challenge due to the nonlinear rapid capacity decay caused by the accumulation of inner electrochemical deterioration. Here, we use a classic deep neural network algorithm to study the degradation laws in later battery service life under the common role of multiple health indicators. A battery cyclic data pre-processing method is proposed and several characteristic parameters with a high correlation to battery life are carefully selected. Our models achieve an average test error within 5% using any continuous 30 cycles of data to predict the battery capacity curve in the next 200 cycles. This study highlights the promise of combining deliberate data processes with health indicators in data-driven modeling to predict the later service life of lithium-ion batteries.

    DOI: 10.1016/j.jpowsour.2022.231818

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  • Simulated solar light-driven photothermal preferential oxidation of carbon monoxide in H<inf>2</inf>-rich streams over fast-synthesized CuCeO<inf>2–x</inf> nanorods 査読有り 国際誌

    Guo X., Ye W., Chen Z., Zhou A., Jin D., Ma T.

    Applied Catalysis B: Environmental   310   2022年08月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Aiming for purification the trace amount of CO in H2-rich streams with reduced energy consumption and low cost, solar-driven photothermal preferential oxidation of carbon monoxide on the non-precious metal oxide catalyst is proposed in this work. Cu doped CuCeO2−x nanorods catalysts were synthesized with a fast and simple coprecipitation method at the room temperature, which shows high CO oxidation activity in photothermal preferential oxidation of CO (CO-PROX) under UV-Vis-IR light irradiation. Rely on the various characterization methods such as UV-Vis-IR diffuse reflection spectrum (UV-Vis-IR DRS), photoluminescence spectrum (PL), transient photocurrent test, HRTEM, XRD, XPS, UV-Raman and H2-TPR, the optical and chemical properties of the CuCeO2−x nanorods catalysts were uncovered. The photothermal catalytic activity of CuCeO2−x nanorods doped with 10 wt% Cu reaches to 90% CO conversion under Xe lamp illumination (2.5 suns), and the solar driven photothermal CO-PROX reaction on CuCeO2−x nanorods were proposed to be proceeded by the light-to-thermal conversion and subsequently to drive a thermal catalytic process. The catalytic performance of CuCeO2−x nanorods in photothermal CO-PROX is closely related to the photo-to-thermal conversion efficiency and Cu-Ce synergetic interaction of CuCeO2−x nanorods catalyst. The introduction of CuOx greatly broaden the optical absorption range and promotes the light absorption capacity of ceria nanorods, which induces the catalyst with high photo-to-thermal conversion capability. Moreover, the optimal copper dopant benefits to enhance the Cu-Ce synergetic interaction and accelerate the oxidation reaction taking place at low temperature. CuCeO2−x nanorods catalyst shows promising competitive activity and ultra-low cost compared with the noble-based catalyst for the purification of hydrogen streams by the clean and eco-friendly sunlight sources.

    DOI: 10.1016/j.apcatb.2022.121334

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  • Organic/inorganic hybrid quaternary ionogel electrolyte with low lithium-ion association and uniform lithium flux for lithium secondary batteries 査読有り 国際誌

    Zhang Y., Li P., Qiao L., Sun J., Li G., Yan Y., Liu A., Ma T., Hao C.

    Electrochimica Acta   416   2022年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    High-energy-density lithium secondary batteries require high-voltage electrolyte. Ionic liquids with wide electrochemical window have been regarded as promising electrolyte candidate for high-safety electrochemical devices. However, the solvation state of lithium ions severely restricts the conductivity due to the sluggish kinetics of lithium-ion cluster. Moreover, the leakage risk also impedes its practical application. Here, we propose to mitigate the above issues by designing organic/inorganic hybrid quaternary ionogel electrolyte (PSIL). The key to our strategy is promoting the dissociation of Li (TFSI)2− cluster and increasing the percentage of free Li+ in the ionogel electrolyte. The amorphous matrix formed by PEO and SiO2 increases the interaction between Li+ and PEO, reducing the association of Li (TFSI)2− cluster. And then, the synergistic transportation of lithium ions by PEO and ionic liquid promises the high conductivity of PSIL. As a result, the ionogel electrolyte shows a high conductivity of 1.50 ×10−3 S•cm−1at 20 ℃. The impressive electrochemical performance with LiFePO4 cathode indicates the high compatibility with the electrode. The ex-situ SEM and molecular dynamic simulation both demonstrate the uniform transportation of lithium ions during the electrochemical process and indicate the successful design for the quaternary ionogel electrolyte.

    DOI: 10.1016/j.electacta.2022.140292

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  • Highly efficient and stable perovskite solar cells induced by novel bulk organosulfur ammonium 査読有り 国際誌

    He Z., Xu C., Li L., Liu A., Ma T., Gao L.

    Materials Today Energy   26   2022年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The additives can improve the crystallization and formation, passivate defects, stabilize the phase state, and adjust the interfacial structure and energy level of perovskite film in perovskite solar cells. Most additives are single functional additives and bifunctional additives. Only a few investigations have been reported about the multifunctional additives. In this work, a novel bulk organosulfur ammonium has been synthesized and utilized as multifunctional additive in perovskite solar cells. Due to the specific structure, the dithiooxamide iodide (DTAI2) additive could improve the crystallization of perovskite film, reduce the trap state density, and prevent the ionic migrating, resulting in the improved power conversion efficiency. The mechanism of the enhanced efficiency has been systematically discussed based on the photophysical properties.

    DOI: 10.1016/j.mtener.2022.101004

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  • Petal-like Fe<inf>x</inf>S<inf>y</inf>/WS<inf>2</inf>Heterojunction Nanosheets as an Electrocatalyst for Highly Effective Hydrogen Evolution Reaction 査読有り 国際誌

    Chen H., Li Y., Huang H., Kang Q., Ma T.

    Energy and Fuels   36 ( 9 )   4888 - 4894   2022年05月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Developing transition metal sulfide electrocatalysts with high efficiency for hydrogen evolution reaction (HER) are highly expected to promote the development of hydrogen energy. Herein, novel iron tungsten sulfide heterojunction nanosheets (FexSy/WS2Ns) with a petal-like structure were prepared by a facile hydrothermal method. The prepared petal-like FexSy/WS2Ns owned a large diameter size of ∼1 μm and a thickness of 8 nm for each flake. The developed FexSy/WS2Ns exhibited excellent HER activity with an overpotential of 118 mV at 10 mA cm-2and a low Tafel slope of 87 mV dec-1in 0.5 M H2SO4, which is much better than that of single FexSyand WS2(>420 mV at 10 mA cm-2). This advanced HER activity is owed to the unique thin structure and more exposed active sites provided by defects between the crystal interface of FexSyand WS2. Furthermore, the FexSy/WS2Ns as a bifunctional electrocatalyst could achieve energy-saving water-splitting by replacing the oxygen evolution reaction with the urea oxidation reaction to decrease the applied voltage to 147 mV.

    DOI: 10.1021/acs.energyfuels.2c00483

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  • A comprehensive study on ZIF-8/SiO<inf>x</inf>/ZIF-8 core-shell composite as high-stable anode material for lithium-ion batteries 査読有り 国際誌

    Zou W., Li T., Yao Z., Fan M., Ma T.

    Journal of Electroanalytical Chemistry   912   2022年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Silicon oxide is a potential candidate for lithium-ion battery anode material, but its commercial application is heavily restricted by the low conductivity and serious volume expansion during charge/discharge cycles. Here, ZIF-8/SiOx/ZIF-8 composite, with core–shell structure, was designed and prepared to overcome the above defects. The ZIF-8/SiOx/ZIF-8 composite shows 966/986 mAh g−1 after the 200th charge/discharge cycle at 0.1C, and the efficiency is up to 98%. Microstructure characterization shows that ZIF-8 not only regulates the particle size of SiOx, but also builds a three-dimensional network structure, which provides a buffer space to support the volume changes of SiOx during charge/discharge and prevent the loss of capacity caused by SiOx breaking away from the anode surface. In addition, the influence of carbonization at 600 °C on ZIF-8/SiOx/ZIF-8 composite was systematically investigated. The carbonized composite shows a charge/discharge capacity (0.1C) of 926/938 mAh g−1 after 200 cycles, and the coulombic efficiency reaches 99%. Our study provides a feasible strategy for obtaining a core–shell SiOx-based composite, which effectively promotes the development of high-capacity Li-ion battery anode material.

    DOI: 10.1016/j.jelechem.2022.116258

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  • Mechanism of oxygen reduction reaction on Ni/CNTs and Ni/X-CNTs (X=B, N, O) catalysts: a theoretical study 査読有り 国際誌

    Zhu H., Yang Y., Kong M., Ren X., Ma T., Liu A.

    Theoretical Chemistry Accounts   141 ( 5 )   2022年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Fuel cell is an emerging technology for energy conservation and environmental protection, with simple structure and high energy conversion efficiency. However, the kinetics of cathode ORR is slow. Therefore, high-performance, highly selective catalysts are urgently needed. This work aims to use the DFT to conduct structural design and performance optimization of Ni/CNTs and Ni/X-CNTs (X=B, N, O) catalysts. Studies showed that the number of Ni atom loading, the number and types of doping of heteroatoms all affected the activity of catalysts to some extent. The adsorption energy of O2 was calculated to determine that O2 was adsorbed on Ni(6)/B(2)-CNTs in the Bridge mode. Meanwhile, the comparative analysis of 2 e− path and 4 e− path indicated that ORR occurred in Ni(6)/B(2)-CNTs in acidic medium was more inclined to follow the 4 e− path. The present work has some reference and value for specific experiments.

    DOI: 10.1007/s00214-022-02888-4

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  • Trimetal NiCoMn sulfides cooperated with two-dimensional Ti<inf>3</inf>C<inf>2</inf> for high performance hybrid supercapacitor 査読有り 国際誌

    Zhang J., Yao Z., Zou W., Shen Q., Fan M., Ma T.

    Journal of Solid State Chemistry   308   2022年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Transition trimetallic sulfide NiCoMn–S attracts great attention due to its high specific capacity for hybrid supercapacitors, as well as Ti3C2 is considered essentially as a potential new electrode material with iconic two-dimensional layered structure and excellent conductivity. Herein, NiCoMn–S nanoparticles are composited with two-dimensional layered Ti3C2 via simple one-step hydrothermal method, which is first applied as positive electrode in hybrid supercapacitors (HSCs). A large number of NiCoMn–S nanoparticles distribute on the surface of Ti3C2 and even insert into the Ti3C2 layers, providing abundant electrochemical active sites for redox reaction and enhancing the mechanical stability for composites. Moreover, the NiCoMn–S/Ti3C2 composites show lower charge-transfer resistance than pure NiCoMn–S, illustrating that the two-dimensional layered structure of Ti3C2 improve the conductivity and supply additional electronic channels for ion transportation. The NiCoMn–S/Ti3C2-3.4% delivers a specific capacity of 347.1 ​C ​g−1 at a specific density of 1 ​A ​g−1, which is 28% higher than that of pure NiCoMn–S (270.2 ​C ​g−1 at 1 ​A ​g−1). Finally, a hybrid supercapacitor (HSC) is assembled by using NiCoMn–S/Ti3C2-3.4% as positive electrode and RGO as negative electrode, realizing a specific capacity of 164.3 ​C ​g−1 at 1 ​A ​g−1 and high specific energy of 16.2 ​Wh kg−1 at a specific power of 15 ​kW ​kg−1.

    DOI: 10.1016/j.jssc.2022.122909

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  • Synthesis of one-dimensional vanadium-doped CoS/Co<inf>9</inf>S<inf>8</inf> heterojunctions as bifunctional electrocatalysts for zinc-air battery 査読有り 国際誌

    Huang H., Liu A., Kang Q., Ye X., Chen H., Su W.N., Ma T.

    Materials Today Energy   25   2022年04月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Cobalt-based electrocatalysts have been considered promising materials for the oxygen evolution reaction (OER). Herein, we now report the synthesis of vanadium-doped CoS/Co9S8 heterostructures embedded on carbon nanorods (V-CoS/Co9S8@CNR), which was realized through one-step sulfurization of Zeolitic Imidazolate Framework-67 (ZIF-67) grown on V2O5 nanorods (V2O5@ZIF-67). The results of experiment and theoretical calculation verified that because of the vanadium dopant and the coupled nanointerface that can expedite the synergistic effect of Co9S8 and CoS, the obtained V-CoS/Co9S8@CNR showed an excellent OER catalytic performance (269 mV@10 mA/cm2) and comparable ORR catalytic performance. The assembled rechargeable Zn-air batteries displayed a superior performance as well as high charging–discharging cycling stability (>200 h) with a slight increase in the voltage gap.

    DOI: 10.1016/j.mtener.2022.100968

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  • Sn/SnO<inf>x</inf> core-shell structure encapsulated in nitrogen-doped porous carbon frameworks for enhanced lithium storage 査読有り 国際誌

    Liu K., Meng X., Yan L., Fan M., Wu Y., Li C., Ma T.

    Journal of Alloys and Compounds   896   2022年03月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Sn-based materials are promising as high-capacity anode materials for lithium-ion batteries. A novel Sn/carbon composite is obtained facilely by using Sn-based metal-organic frameworks and dicyandiamide as precursors. The composites are composed of Sn/SnOx core-shell microspheres encapsulated in 3D porous nitrogen-doped carbon frameworks (denoted as Sn/SnOx@NC). When used as anode material for lithium-ion batteries, the Sn/SnOx@NC composite exhibites a high reversible capacity of 817.8 mA h g−1 at 100 mA g−1 after 200 cycles and 525.7 mA h g−1 at 1 A g−1 after 800 cycles. It also exhibits high capacity retention and high Coulombic efficiency. The excellent electrochemical performance can be primarily ascribed to the peculiar porous N-doped carbon frameworks, which can effectively buffer the huge volume change of Sn and promote the transmission of electrons and Li+, thereby indicating its potential for use as an anode material for Li-ion batteries.

    DOI: 10.1016/j.jallcom.2021.163009

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  • A cross-linked tin oxide/polymer composite gel electrolyte with adjustable porosity for enhanced sodium ion batteries 査読有り 国際誌

    Zhao Y., Liu H., Meng X., Liu A., Chen Y., Ma T.

    Chemical Engineering Journal   431   2022年03月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Solid electrolytes have a great potential to replace traditional flammable liquid electrolytes for lithium/sodium ion batteries. However, the solid electrolytes have a low ionic conductivity and poor interface properties, so it is difficult for them to reach the level of conventional liquid electrolyte systems. We have now built an adjustable porous 3D network structure by contacting PVDF-HFP and SnO2, and optimized the ion conductive path in the gel polymer electrolyte by adding 1-(4-cyanophenyl)-guanidine. PVDF-HFP with a 3D network structure provides a channel for storing and transporting sodium ions, and the imino nitrogen atom of 1-(4-cyanophenyl)guanidine can form a ligand with sodium ions to enhance the conduction of Na+. The gel polymer electrolyte (PSGGSE) thus obtained has an ion conductivity of 0.232 mS cm−1 at 70 °C, and is easy to form a stable interface layer with the anode. Further experiments showed that compared with liquid electrolytes, a more stable interface was formed between PSGGSE and the anode. Cycling tests of Na/PSGGSE/Na symmetric batteries under different current densities showed that no short circuit occurred after 400 h, indicating that the battery could not be short-circuited, and PSGGSE can effectively inhibit the growth of Na dendrites. In addition, the Na/PSGGSE/NiMoO4 battery has an excellent cycling stability at the current density of 100 mA g−1, and still maintains a high capacity of 150 mAh g−1 after 200 cycles, which is much higher than that of liquid electrolytes.

    DOI: 10.1016/j.cej.2021.133922

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  • Template synthesis of molybdenum-doped NiFe-layered double hydroxide nanotube as high efficiency electrocatalyst for oxygen evolution reaction 査読有り 国際誌

    Yin Z., Liu X., Cui M., Cao Z., Liu A., Gao L., Ma T., Chen S., Li Y.

    Materials Today Sustainability   17   2022年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Oxygen evolution reaction (OER) with four proton–electron coupled transfer process is a half-reaction that restricts the development of rechargeable metal-air batteries and water splitting devices, and it is of great significance to develop inexpensive and efficient OER catalysts. Herein, Mo-doped NiFe-layered double hydroxide (Mo–NiFe-LDH) nanotubes are synthesized using a self-sacrificial template method. Benefitting from the unique nanostructure, Mo–NiFe-LDH-2 exhibits a large electrochemical surface area of 63.94 cm2. In addition, a strong electronic interaction occurs between Mo, Fe, and Ni after Mo doping, resulting in highly active Ni3+ sites. Consequently, the Mo–NiFe-LDH-2 shows high OER activity with an overpotential of 317 mV to deliver a current density of 20 mA cm−2 and a small Tafel slope of 44 mV dec−1. This work provides a feasible strategy to develop high efficiency electrocatalysts through transition metal doping and structural regulation.

    DOI: 10.1016/j.mtsust.2021.100101

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  • Praseodymium-doped triple-cation perovskite layer for enhanced photovoltaic performance 査読有り 国際誌

    Sun L., Zhang C., Yan L., Gao L., Ma T.

    Journal of Solid State Chemistry   307   2022年03月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Doping a hybrid perovskite semiconductor with metal elements offers an effective means of adjusting its photoelectric properties. To give one example, it has been found that adding lanthanide elements such as Europium (Eu) and Samarium (Sm) into a perovskite layer enhances the photovoltaic performance and photothermal stability of perovskite solar cells. In this study, we therefore added different Praseodymium (Pr)/Lead (Pb) ratios from 0% to 1% to perovskite films in a precursor solution of tri-cation perovskite. We found the photoelectric properties and device performance of perovskite solar cells doped with 0.25% Praseodymium ion (Pr3+) to be significantly improved, with a champion power conversion efficiency (PCE) of 18.56% obtained. Furthermore, the stability of perovskite solar cells (PSCs) with 0.25% Pr3+ doping improved effectively. Overall, with Pr3+ doping, the carrier mobility was dramatically enhanced, and the carrier recombination effectively hindered. These results therefore indicate that Pr3+ doping causes the perovskite to produce lattice shrinkage. As such, the findings shed light on a fresh dopant engineering tactic for fabricating high performance perovskite solar cells.

    DOI: 10.1016/j.jssc.2021.122826

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  • Interface engineering of the MoS<inf>2</inf>/NiS<inf>2</inf>/CoS<inf>2</inf> nanotube as a highly efficient bifunctional electrocatalyst for overall water splitting 査読有り 国際誌

    Yin Z., Liu X., Chen S., Xie H., Gao L., Liu A., Ma T., Li Y.

    Materials Today Nano   17   2022年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Developing advanced electrocatalysis for overall water splitting is the important premise of sustainable and green production of hydrogen. In this work, we report a self-template method to synthesis MoS2/NiS2/CoS2 nanotube based on MoO3 nanorod. The interface engineering and strong electronic interaction of the heterogeneous catalyst greatly increase the electron density around the Fermi level, which could facilitate the adsorption of H and OH-containing intermediates. Ultraviolet photoelectron spectroscopy measurement demonstrates the enhanced electron density, and density functional theory calculation reveals the strengthened H and OH adsorption based on the Gibbs free energy. Combined with the large electrochemical surface area brought by the unique nanotube structure, the MoS2/NiS2/CoS2 displays low overpotentials of 101 and 230 mV to achieve a current density of 10 mA/cm2 for hydrogen evolution reaction and oxygen evolution reaction. In addition, the catalyst can stably drive overall water splitting at a cell voltage of 1.58 V, demonstrating its potential applications.

    DOI: 10.1016/j.mtnano.2021.100156

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  • Unveiling the Effect of Solvents on Crystallization and Morphology of 2D Perovskite in Solvent-Assisted Method 査読有り 国際誌

    Su Y., Xue J., Liu A., Ma T., Gao L.

    Molecules   27 ( 6 )   2022年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Controlling the crystallographic orientations of 2D perovskite is regarded as an effective way to improve the efficiency of PSCs based on 2D perovskite. In this paper, five different assistant solvents were selected to unveil the effect of solvents on crystallization and morphology of 2D perovskite in a solvent-assisted method. Results demonstrated that the effect of Lewis basicity on the crystallization process was the most important factor for preparing 2D perovskite. The stability of the intermediate, reacted between the solvent and the Pb2+, determined the quality of 2D film. The stronger the Lewis basicity was, the more obvious the accurate control effect on the top-down crystallization process of 2D perovskite would be. This could enhance the crystallographic orientation of 2D perovskite. The effect of Lewis basicity played a more important role than other properties of the solvent, such as boiling point and polarity.

    DOI: 10.3390/molecules27061828

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  • Multifunctional porous carbon strategy assisting high-performance aqueous zinc-iodine battery 査読有り 国際誌

    Yan L., Liu T., Zeng X., Sun L., Meng X., Ling M., Fan M., Ma T.

    Carbon   187   145 - 152   2022年02月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Despite its cost-effectiveness and intrinsic safety, the aqueous zinc-iodine battery is still struggling with the rapid performance degradation arising from the uneven deposition of the zinc anode and the dissolution of the iodine cathode. An effective solution of addressing the above issues simultaneously is urgently needed. Here we propose a strategy of using one porous carbon to modify the zinc anode and immobilize the iodine active materials. Zinc citrate-derived porous carbon is selected as a study model. The conductive porous carbon can not only greatly reduce the zinc nucleation barrier, and guide a uniform deposition of zinc ions, but also notably suppress the dissolution of iodine species and enhance the reaction kinetics. As a consequence, the optimized zinc-iodine battery exhibits capacity retention of 88.1% after 3000 cycles at 12C, finishing a cycle within 5 min.

    DOI: 10.1016/j.carbon.2021.11.007

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  • Current progress of metal sulfides derived from metal-organic frameworks for advanced electrocatalysis: Potential electrocatalysts with diverse applications 査読有り 国際誌

    Liu X., Li Y., Cao Z., Yin Z., Ma T., Chen S.

    Journal of Materials Chemistry A   10 ( 4 )   1617 - 1641   2022年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    The large-scale application of clean electrochemical energy storage and conversion systems such as water-splitting devices and Zn-air batteries greatly depends on the development of low-cost and highly efficient electrocatalysts. Transitional metal sulfides (TMSs) have gained great research interest owing to their high intrinsic catalytic activity, adjustable electronic structures, and various crystal structures and phases. Meanwhile, metal-organic frameworks (MOFs) are ideal precursors for the preparation of TMSs due to the diverse metal nodes, organic ligands, topologies, and morphologies of MOFs. In addition, MOFs could act as hosts for the incorporation of guest molecules, which could further expand the metal types of TMSs. In this review, the recent progress of MOF-derived TMS electrocatalysts for hydrogen evolution reactions (HERs), oxygen evolution reactions (OERs) and oxygen reduction reactions (ORRs) are summarized. After a brief introduction to the reaction mechanisms, the preparation strategies, structures, catalytic performances, and catalytic mechanisms of the TMSs are discussed to give readers a comprehensive understanding of this prosperous field. The strategies such as nanostructure engineering, interface engineering and heteroatom doping used to improve the performance of the electrocatalysts are discussed in each section. In addition, bifunctional catalytic performances of the catalysts for overall water splitting and rechargeable Zn-air batteries are illustrated. Furthermore, challenges and opportunities for the future development of this field are proposed. We expect this review could provide guidelines for the design and fabrication of TMSs, and initiate more efforts and new discoveries in this emerging research area.

    DOI: 10.1039/d1ta09925f

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  • A double perovskite participation for promoting stability and performance of Carbon-Based CsPbI<inf>2</inf>Br perovskite solar cells 査読有り 国際誌

    Han Q., Yang S., Wang L., Yu F., Cai X., Ma T.

    Journal of Colloid and Interface Science   606   800 - 807   2022年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    All-inorganic perovskite materials (Typically: CsPbI2Br) have attracted enormous attention due to their illustrious thermal stability and appropriate bandgap, and their use in perovskite solar cells (PSCs) has been extensively investigated. However, the inevitable defects of the perovskite layer, energy level mismatch between perovskite and carbon electrodes, and the phase instability of CsPbI2Br limit the power conversion efficiency (PCE) and stability of carbon-based CsPbI2Br PSCs. Herein, we demonstrate a simple and effective strategy for regulating energy level, inhibiting carrier recombination, and delaying the degradation of perovskite by modifying the surface of CsPbI2Br with a new type of 2D perovskite Cs2PtI6. The carbon-based CsPbI2Br PSCs achieve a higher PCE (13.69 %) than the control device (11.10 %). The excellent matching of the energy level and suppression of charge carrier recombination should be responsible for the improvement in efficiency. Furthermore, the excellent hydrophobic performance of Cs2PtI6 enhances the moisture resistance of the device. This study provides a potential strategy for improving the performance and stability of all-inorganic CsPbI2Br PSCs.

    DOI: 10.1016/j.jcis.2021.07.122

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  • Ru and Fe Alloying on a Two-Dimensional MXene Support for Enhanced Electrochemical Synthesis of Ammonia 査読有り 国際誌

    Liu A., Liang X., Gao M., Ren X., Gao L., Yang Y., Zhu H., Li G., Ma T.

    ChemCatChem   14 ( 7 )   2022年01月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Compared with the energy-intensive Haber-Bosch process, the electrocatalytic nitrogen reduction reaction (NRR) is a promising approach for sustainable ammonia production. However, the design and development of electrocatalysts with high activity and selectivity is currently a major challenge. In this work, we successfully constructed RuFe bimetallic nanoparticles on a two-dimensional MXene support (RuFe@MXene) through a simple liquid phase reduction method. Benefiting from the rich surface chemistry and high electronic conductivity of MXene, as well as the synergistic effect between RuFe bimetals, the composite can efficiently synthesize ammonia under environmental conditions. Specifically, the NH3 yield and Faraday efficiency of the prepared Ru0.3Fe0.7@MXene composite catalyst reaches 40.79 μg h−1 cm−2 and 15.25 % at −0.4 V vs. RHE in 0.1 M KOH, which are significantly higher than that of the previously reported Ru@MXene. Moreover, the Ru0.3Fe0.7@MXene catalyst also exhibits outstanding electrochemical stability. The density of state (DOS) and the partial density of state (PDOS) of MXene, Fe@MXene, Ru@MXene, and RuFe@MXene were calculated by DFT to explore the synergistic effect of RuFe on the nitrogen reduction performance of MXene-based catalysts. This work guides the design of high-performance NRR electrocatalysts in the future.

    DOI: 10.1002/cctc.202101775

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  • DFT study of X-site ion substitution doping of Cs<inf>2</inf>PtX<inf>6</inf> on its structural and electronic properties 査読有り 国際誌

    Ye X., Liu A., Zhao Y., Han Q., Kitamura T., Ma T.

    International Journal of Energy Research   46 ( 6 )   8471 - 8479   2022年01月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The stability and toxicity of perovskite solar cells are still preventing full industrialization. Therefore, lead-free all-inorganic double perovskite materials have become the focus of research in recent years. Our group proposed a new narrow bandgap lead-free double perovskite solar cell using a high-quality Cs2PtI6 film. In this paper, for the purpose of exploring the trend in the bandgap and stability of the perovskite-derived Cs2PtI6 substituted by halogen ions, we performed a first-principles investigation based on density functional theory to study the structural and electronic properties of Cs2PtI6−yCly, Cs2PtI6−yBry, Cs2PtBr6−yCly (y = 0, 1, 2, 3, 4, 5, 6). The calculated structural parameters revealed a good mechanical stability for all these compounds, and the trend in the formation energy indicated that the substitution of I− with Cl− and Br− can significantly reduce the energy and improve the thermodynamic stability. Through a comparative analysis of the electronic properties of Cs2PtX6 (X = Cl, Br, I), we found that the substitutional doping of halogen ions can effectively adjust the bandgap and show an obvious change trend. The present study may demonstrate an effective theoretical guidance for preparing lead-free all-inorganic perovskite solar cell materials with appropriate bandgap and excellent stability.

    DOI: 10.1002/er.7696

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  • Two-Dimensional MXene Supported Bismuth for Efficient Electrocatalytic Nitrogen Reduction 査読有り 国際誌

    Liu A., Liang X., Zhu H., Ren X., Gao L., Gao M., Yang Y., Li G., Ma T.

    ChemCatChem   14 ( 7 )   2022年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electrochemical nitrogen reduction reaction (NRR), as a green and sustainable ammonia (NH3) synthesis process, is considered to be the most promising alternative to the traditional Haber-Bosch method for NH3 synthesis. However, this process requires a highly active electrocatalyst to overcome the problems of low NRR activity and selectivity. Herein, we deposited metallic bismuth nanoparticles on two-dimensional Ti3C2 MXene nanosheets by a simple liquid phase reduction method to synthesize Bi@Ti3C2 nanocomposites. This composite material is a promising electrocatalyst for environmental electrocatalytic N2 fixation to NH3. Unexpectedly, the Bi@Ti3C2 composite obtains an excellent NH3 yield and Faraday efficiency as high as 28.3 μg h−1 cm−2 and 27.2 % at −0.4 V versus reversible hydrogen electrode (RHE) in 0.1 M KOH. The high NRR activity can be attributed to the unique N-philic and H-phobic characteristics of Bi atoms and the outstanding electronic conductivity of MXene. Moreover, the Bi@Ti3C2 composite catalyst also exhibited good cycling stability and durability of up to 24 h. This work highlights the potential importance of material design and will also expand the research and exploration of high-efficiency NRR electrocatalysts.

    DOI: 10.1002/cctc.202101683

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  • Interface Engineering and Anion Engineering of Mo-Based Heterogeneous Electrocatalysts for Hydrogen Evolution Reaction 査読有り 国際誌

    Yin Z., Liu X., Chen S., Ma T., Li Y.

    Energy and Environmental Materials   2022年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Development and utilization of hydrogen energy is an effective way to achieve carbon neutrality, only hydrogen production through electrolytic water splitting meets the goal of zero carbon emission. To facilitate the large-scale commercialization of water splitting devices, the development of highly efficient and low-cost catalysts to reduce the energy consumption is essential. MoS2 has been regarded as a promising electrocatalyst to replace platinum in hydrogen evolution reaction due to its low price and unique 2D layered structure. However, the poor conductivity and inert basal planes of MoS2 limited its wide-spread application. Recently, researches have demonstrated that the conductivity and active sites of MoS2 can be improved by heteroatoms doping or constructing of heterogeneous structures. In this review, the recent progress of Mo-based catalysts are summarized centered on MoS2 based on interface engineering and anion engineering, including MoS2–MoO2, MoS2–Mo2C, MoS2–MoNx, MoS2–MoP, and MoS2–MoSe2. The preparation method, structure, and performance of the catalysts are introduced and the possible mechanism behind the improved catalytic activity are revealed to give readers an overall comprehension on the progress of the Mo-based electrocatalysts for hydrogen evolution reaction. In addition, an outlook on future opportunities and development directions of Mo-based catalysts are proposed to facilitate the development of Mo-based catalysts for hydrogen production.

    DOI: 10.1002/eem2.12310

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  • In situ growth of a bifunctional modification material for highly efficient electron-transport-layer-free perovskite solar cells 査読有り 国際誌

    Gao L., Xu C., He Z., Su Y., Ma T.

    New Journal of Chemistry   46 ( 26 )   12767 - 12772   2022年01月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The elimination of electron transport layers (ETLs) to fabricate ETL-free perovskite solar cells (PSCs) could save manufacturing costs and time. However, compared with PSCs based on the traditional architecture, ETL-free PSCs suffered low efficiency due to the device shunting and large energy barriers for carriers. Herein, a bifunctional interfacial modification material, 3-aminopropyl trimethoxy silane (APS), is selected and in situ grown on a transparent conducting oxide (TCO). On the one hand, the increased hydrophobicity of APS modified indium tin oxide (ITO) could improve the crystal growth of perovskites, resulting in larger grain sizes and reduced surface defects. On the other hand, the APS modification could improve the energy level alignment of ITO and the perovskite, leading to enhanced electron extraction and hole blocking. The PCE of the ETL-free PSCs based on APS modified ITO reached 19.09%, which was over 60% higher than that of ETL-free PSCs based on ITO.

    DOI: 10.1039/d2nj01965e

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  • A Heat-Liquefiable Solid Precursor for Ambient Growth of Perovskites with High Tunability, Performance and Stability 査読有り 国際誌

    He Y., Lin Z., Wang J., Zhang K., Xu X., Li Y., Huang X., Ma T., Xiao S., Yang S.

    Small Methods   2022年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Halide perovskites are intensively studied for applications in optoelectronic devices because of their outstanding properties and relatively low cost. However, the common precursor solutions for perovskite fabrication are rather unstable in the presence of moisture and oxygen, limiting the large-scale low-cost production of perovskite. Herein, water is used counterintuitively to formulate an ambient stable perovskite precursor, which is peculiar in that it is solid at room temperature but becomes a liquid at 75 °C. The non-fluidity of the precursor stemmed from the water-assisted intermediate fiber assembly, conferring high damp air stability. Yet the heat-liquefiability made the precursor highly processible for perovskite growth, and when guided by polyvinyl pyrrolidone coordination with Pb2+, the perovskite can preferentially grow along the [200] direction, significantly improving the film quality. To demonstrate the utility of the precursor, it has been used to fabricate self-driven halide perovskite photodetectors, which exhibited a low noise current of 2.0 × 10−14 A Hz−1/2, a high specific detectivity up to 1.4 × 1013 Jones, and high stability of 20 days of operation with only < 5% external quantum efficiency decay. This type of solid-liquid convertible precursor opens up new opportunities for wider applications of perovskites.

    DOI: 10.1002/smtd.202200384

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  • Cascaded band gap design for highly efficient electron transport layer-free perovskite solar cells 査読有り 国際誌

    Gao L., Xu C., Su Y., Liu A., Ma T.

    Chemical Communications   2022年01月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The elimination of the electron transport layer (ETL) to fabricate ETL-free perovskite solar cells (PSCs) could save manufacturing cost and time. However, the direct contact of the perovskite and transparent conducting oxide (TCO) electrodes results in mismatched energy level alignment and current leakage. Therefore, ETL-free PSCs suffer from unsatisfactory photovoltaic performance. Herein, a special perovskite material with a cascaded band gap, called gradient homojunction perovskite (GHJP), is designed and synthesized by a large cation-assisted method. The inherent nature of GHJP was the type-II cascaded energy level alignment, which could block holes during the electron collection. This facilitated the dissociation of the excitons in the GHJP. Due to the excellent properties, ETL-free PSCs based on GHJP obtained 20.55% PCE, which was over 90% higher than that of ETL-free PSCs based on the control perovskite material.

    DOI: 10.1039/d2cc01807a

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  • Sulfur contributes to stable and efficient carbon-based perovskite solar cells 査読有り

    Liu C., He Z., Li Y., Liu A., Cai R., Gao L., Ma T.

    Journal of Colloid and Interface Science   605   54 - 59   2022年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The power conversion efficiency (PCE) of perovskite solar cells (PSCs) is already higher than those of other thin-film photovoltaic technologies, but the stability issue limits their applications. The introduction of sulfur-based compounds in PSCs could contribute to their stability. Herein, sulfur-based compounds have been embedded into each functional layer to stabilize carbon-based PSCs (C-PSCs). Results showed that the simultaneous introduction of sulfur-based compounds could decrease the trap states of perovskite film, enlarge the grain size of perovskite, and accelerate the charge transfer and extraction, leading to an improved performance. Comparing with the device without sulfide (10.77%), all sulfide C-PSCs obtained a PCE of 15.38%. The stability test showed much better resistance to humidity and thermal stress for all sulfide C-PSCs. They could retain 80% of initial PCE after aging about 700 h at relative humidity (RH) 45% ± 10% and 80 °C.

    DOI: 10.1016/j.jcis.2021.07.058

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  • Self-assembly synthesis of Ni-decorated Nb<inf>2</inf>C MXene as an efficient and stable catalyst towards electrochemical nitrogen reduction 査読有り 国際誌

    Zhu H., Xue S., Liang Z., Liang X., Li G., Ren X., Gao L., Li Q., Ma T., Liu A.

    Ceramics International   2022年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electrochemical nitrogen reduction reaction (NRR) is widely regarded as a green and environmentally sustainable strategy with the promise for industrial-scale ammonia synthesis under ambient conditions. To promote its industrialization, we synthesized an economical, efficient and stable Ni-decorated Nb2C (Ni@Nb2C) MXene-based catalyst. The Ni@Nb2C MXene displays excellent electrocatalytic NRR performance with NH3 yield of 26.16 μg cm−2 h−1 and Faradaic efficiency of 7.3%. Remarkably, the general methodology reported here paves the way to effectively synthesize various other metals-decorated MXenes, which not only enrich the MXene-based catalysts but also significantly promote their practical utilization in a wide range of environment- and energy-related fields. It is of great significance for the harmonious development of humans and nature.

    DOI: 10.1016/j.ceramint.2022.04.027

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  • Perovskite Solar Cells in Space: Evaluation of Perovskite Solar Cell Hole Transport Material in Space Environment 査読有り 国際誌

    BAUTISTA Izrael Zenar C., YANG Shuzhang, KUYYAKANONT Aekjira, IWATA Minoru, MA Tingli, CHO Mengu

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES ( 一般社団法人 日本航空宇宙学会 )   65 ( 2 )   95 - 107   2022年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.2322/tjsass.65.95

    CiNii Research

  • High-performance carbon-based CsPbI<inf>2</inf>Br perovskite solar cells via small molecule modification 査読有り

    Han Q., Yu F., Wang L., Yang S., Cai X., Meng X., Yūta O., Takeshi K., Zhang C., Ma T.

    Journal of Power Sources   516   2021年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    All-inorganic CsPbI2Br perovskite material has attracted enormous attention for high-performance photovoltaics due to its excellent thermal stability and suitable bandgap. Furthermore, carbon-based CsPbI2Br perovskite solar cells (C-PSCs) not only further improve the thermal and moisture stability of the devices but also reduce production costs and simplify procedure processes. However, the usage of carbon electrodes introduces new problems, such as poor interface contact and energy level mismatch. Herein, the N-phenylthiourea (PTU) with S atom and N-phenylurea (PU) with O atom are applied for interface modification materials in C-PSCs. The atoms S and O can combine with Pb and enhance perovskite crystallinity as well as manage the energy level. Meanwhile, after passivation of PTU and PU, the defect state density of the perovskite layer is significantly reduced, thereby inhibiting the recombination of carriers. The Voc of the device with PTU increases from 1.12 V to 1.22 V, 9% improvement over the control device. The efficiency of CsPbI2Br C-PSCs is improved from 10.29% to 13.01% after modification. Furthermore, the stability of the device has been improved. This study provides a strategy for developing highly efficient and stable C-PSCs.

    DOI: 10.1016/j.jpowsour.2021.230676

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  • MOFs and their derivatives as Sn-based anode materials for lithium/sodium ion batteries 査読有り

    Liu K., Li C., Yan L., Fan M., Wu Y., Meng X., Ma T.

    Journal of Materials Chemistry A   9 ( 48 )   27234 - 27251   2021年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    The rapid development of electric vehicles and consumer electronics places higher demands on the performance of secondary batteries. Tin-based materials are expected to be a commercial anode material candidate of next-generation rechargeable batteries due to their high gravimetric/volumetric capacity. However, tin anodes have large volume changes during charge-discharge cycles which leads to a rapid capacity decay. Emerging tin-based metal-organic frameworks (Sn-MOFs) have recently attracted the attention of researchers. Their characteristics of tunable porosity, huge surface areas and multiple active sites offer a wide range of possibilities for Li/Na ion storage and transport, and the coordination bonds stabilize the Sn atoms to the organic matrix buffering pulverization and aggregation. Besides, MOF-related Sn derivatives could also have novel diverse functional structures and achieve high-rate capacity and excellent cycle stability. In this review, we mainly summarize the structural features, energy storage mechanism, and recent advances in the rational design and preparation of Sn-MOFs and MOF-derived Sn-based composites for LiB and SIB anodes, and current challenges and future directions for further development are discussed.

    DOI: 10.1039/d1ta06996a

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  • Over 23% power conversion efficiency of planar perovskite solar cells via bulk heterojunction design 査読有り

    Yang S., Han Q., Wang L., Zhou Y., Yu F., Li C., Cai X., Gao L., Zhang C., Ma T.

    Chemical Engineering Journal   426   2021年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The planar organic–inorganic hybrid perovskite solar cells (PSCs) have in recent years had remarkable success due to their superior optoelectronic performance. However, their power conversion efficiency is significantly inferior compared to mesoporous structure PSCs. Unlike most other advances focusing on non-perovskite materials to improve device performance, herein a multifunctional double perovskite material, Cs2PtI6, is proposed as the grain boundary modifier of organic–inorganic hybrid perovskite films. Results show three main benefits of introducing Cs2PtI6 into perovskite films: (1) it prompts growth of perovskite crystals, resulting in improved crystallinity and enlarged crystals; (2) it suppresses the trap assisted recombination at grain boundaries thanks to the formation of heterojunction and interface passivation; (3) it raises the efficiency of carrier collection and transport at grain boundaries owing to the high carrier mobility of Cs2PtI6. Consequently, a PCE of 23.56% is achieved. The unencapsulated devices show less than 10% degradation compared to the initial performance after storage in ambient (≈ 30%) humidity for 2000 h. This study outlines a simple yet effective strategy for boosting the performance of planar PSCs.

    DOI: 10.1016/j.cej.2021.131838

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  • Organic ammonium salt-assisted pinhole-free CuSCN films for carbon-based perovskite solar cells 査読有り

    He Z., Meng F., Li L., Gao L., Ma T.

    New Journal of Chemistry   45 ( 45 )   21382 - 21388   2021年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Due to the low cost and strong hydrophobicity of carbon electrodes, carbon-based perovskite solar cells (C-PSCs) have drawn much attention. Copper(i) thiocyanate (CuSCN) is a favorable hole transport layer in perovskite solar cells (PSCs) because of its high chemical stability, high conductivity, and high hole mobility, but pinholes often appear during CuSCN film fabrication. In this work, organic ammonium salt, phenethylammonium iodide (PEAI), has been applied to modify the CuSCN film. The results indicated that PEAI not only eliminated the pinholes, but also passivated the perovskite film and enhanced the interfacial connection. Therefore, the power conversion efficiency (PCE) of C-PSCs increased by about 11%. The stability test showed that the C-PSCs, without any encapsulation, could maintain 70% of the initial efficiency after storage for 800 h in ambient air with 60%-70% relative humidity at room temperature.

    DOI: 10.1039/d1nj04068e

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  • Theoretical and experimental study of the influence of PEG and PEI on copper electrodeposition 査読有り

    Liang X., Ren X., He R., Ma T., Liu A.

    New Journal of Chemistry   45 ( 42 )   19655 - 19659   2021年11月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Through theoretical calculation and experimental research, the electrodeposition process of preparing a copper catalyst in an acid electrolyte using polyethylene glycol (PEG), polyethylene imine (PEI), and a PEG and PEI mixture as additives was studied. The cutting-edge molecular orbital information of PEG and PEI was studied through quantum chemical calculations. Molecular dynamics simulations were performed to study the interface interaction between PEG and PEI and the metal surface. The microscopic morphology and crystal structure of the coating were characterized by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). It is found that adding composite additives to the studied acidic copper electroplating could obtain a copper coating with a spherical shape, small particle size, and good dispersion effect. This study proves that a PEI and PEG-based copper plating solution is a promising method for preparing high-performance copper-based catalysts in the acid copper electroplating process.

    DOI: 10.1039/d1nj03503g

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  • Investigation of the interfacial behavior of organics on sulfide semiconductor surfaces by quantum chemical calculations and molecular dynamics simulations 査読有り

    Zhu H., Ren X., Yan S., Liang X., Gao L., Li Y., Zhao Q., Ma T., Liu A.

    New Journal of Chemistry   45 ( 41 )   19321 - 19328   2021年11月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The presence of organic pollutants in the world is harmful to our existence and the environment. So efficient and energy-saving methods for the degradation of organic pollutants present in the environment are important and beneficial for humans and the environment. The use of emerging photocatalytic technology using semiconductor materials to degrade organic pollutants is an effective method with potential prospects for the future. In this work, quantum chemical calculations and classical molecular dynamics simulations are employed to investigate the performances and related reactivities of sulfide semiconductor materials for the photocatalytic degradation of several common organic compounds. The reactivity of the organics is studied using quantum chemical calculations. The adsorption behaviors of several types of organic compounds on the surfaces of sulfide semiconductors in the gas phase were investigated, then similar adsorption processes in the aqueous phase were studied, and then CdS semiconductors were used to explore the influence of different crystal planes on the adsorption behavior of organic matter. Based on adsorption energy calculations, the best adsorption performance for a specific type of organic matter on a sulfide semiconductor was explored, together with an adsorption comparison in the gas and water phases. The results of this study may provide theoretical guidance for sulfide semiconductor photocatalysis technology and give ideas for subsequent experiments.

    DOI: 10.1039/d1nj02939h

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  • Recent progress in metal sulfide-based electron transport layers in perovskite solar cells 査読有り

    He Z., Zhou Y., Liu A., Gao L., Zhang C., Wei G., Ma T.

    Nanoscale   13 ( 41 )   17272 - 17289   2021年11月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    High-quality electron transport layers (ETLs) are essential for stable and efficient perovskite solar cells (PSCs). Metal sulfides (MSs) are considered potential candidates for ETLs due to their high carrier mobility, low cost, and favorable chemical and physical stability. The quality of the MS films plays important role in the photovoltaic performance of PSCs. However, few reports focus on the relative preparation, characteristics, and corresponding mechanisms of MS-based ETLs. In this review, MS-based ETLs are summarized according to their preparation strategies and the mechanism. We hope that this review can help others understand the intrinsic phenomena of MS-based ETLs and motivate further investigations. This journal is

    DOI: 10.1039/d1nr04170c

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  • Two-dimensional nanosheets constituted trimetal Ni-Co-Mn sulfide nanoflower-like structure for high-performance hybrid supercapacitors 査読有り

    Zhang J., Li C., Fan M., Ma T., Chen H., Wang H.

    Applied Surface Science   565   2021年11月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Trimetal NiCoMn-based sulfides with two-dimensional (2D) nanosheets constituted flower-like structures have been synthesized using an anion exchange approach, which exhibit excellent performance as electroactive battery materials for hybrid supercapacitors. These NiCoMn-based sulfides were transformed from layered hydroxides while well maintaining 2D nanosheets constituted flower-like structure. The amounts of Mn constitution have been tuned to control performance of sulfides. It is found that Mn doping causes formation of pure phase sulfide while maintaining same flower-like structure. Mn-doping can enhance specific capacity and cycling stability of sulfides, and resulting sulfides maintain a low charge transfer resistance. Mn-doped sulfides display a maximum specific capacity of 657.7C g−1 at 1 A g−1, and a specific capacity of 339.5C g−1 has been achieved when the specific current increases by 50 times to 50 A g−1. More significantly, the NiCoMn-based sulfide has been used to assemble hybrid supercapacitors with reduced graphene oxide, which achieves a maximum specific energy of 36.3 Wh kg−1 combined with long-term cycling stability.

    DOI: 10.1016/j.apsusc.2021.150482

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  • Solvent-assisted crystallization of two-dimensional Ruddlesden-Popper perovskite 査読有り

    Su Y., Xu C., Gao L., Wei G., Ma T.

    Chemical Communications   57 ( 81 )   10552 - 10555   2021年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Two dimensional (2D) perovskite materials, are more stable than 3D perovskite materials, which could solve the stability issue of perovskite solar cells (PSCs). However, the photovoltaic conversion efficiency (PCE) of PSCs based on 2D perovskite materials was low, due to the high dielectric and quantum confinement of 2D perovskite. In this work, we propose a solvent-assisted method to prepare 2D perovskite films, where the solvent was distributed in a gradient. Therefore, the top-down crystallization process of 2D perovskite can be accurately controlled. The PCE of PSCs fabricated by the solvent-assisted method was enhanced by 48%, compared with the control device. For the packaged devices, the stability test demonstrated that 94% of the initial PCE was still maintained after 1500 hours of storage (25 °C, RH 40%). After carefully analyzing the photophysical process of the carriers in the PSCs based on 2D perovskite, the enhanced carrier transfer mechanism of the solvent-assisted method has been proposed.

    DOI: 10.1039/d1cc03493f

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  • Over 23% Power Conversion Efficiency of Planar Perovskite Solar Cells via Bulk Heterojunction Design 査読有り 国際誌

    Yang Shuzhang, Han Qianji, Ma Tingli

    「次世代の太陽光発電システム」シンポジウム(日本太陽光発電学会学術講演会)予稿集 ( 日本太陽光発電学会 )   1 ( 0 )   89 - 89   2021年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.57295/jpvsproc.1.0_89

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  • Interfacial engineering designed on CuSCN for highly efficient and stable carbon-based perovskite solar cells 査読有り

    Meng F., Gao L., Liu A., Li Y., Ma T.

    Materials Today Energy   21   2021年09月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The undesired energy level alignment and charge recombination at the perovskite/carbon electrode interface limit the application of carbon-based perovskite solar cells (C-PSCs). The incorporation of hole transport materials, CuSCN, is an effective strategy to solve this issue. However, the mismatched crystal structure and lattice between the perovskite layer (cubic crystal) and CuSCN layer (hexagonal crystal) lead to a charge transport barrier due to the gaps at the heterogeneous interface. Herein, the interfacial engineering designed on CuSCN has been carried out, which not only improves the quality of perovskite film but also reduces the defects, enhances the interfacial connection, and ensures rapid charge extraction and transfer. After key parameter adjustment, both high efficiency (15.81%) and good stability of C-PSCs have been obtained. After storage for 2,000 h at ambient air environment, devices without any encapsulation could maintain 93% of their initial efficiency. The thermal stability test shows that the encapsulated devices retain 83% of their initial efficiency after storage for 300 h in dry air at 85 °C. Deep insight and mechanisms have been proposed in this interfacial engineering design for improving the efficiency and stability of C-PSCs.

    DOI: 10.1016/j.mtener.2021.100801

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  • Synthesis and Surface Engineering of Composite Anodes by Coating Thin-Layer Silicon on Carbon Cloth for Lithium Storage with High Stability and Performance 査読有り

    Liu H., Meng X., Chen Y., Zhao Y., Guo X., Ma T.

    ACS Applied Energy Materials   4 ( 7 )   6982 - 6990   2021年07月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Silicon-flexible carbon composites can achieve binder-free application and solve the problem of silicon expansion during cycles. The effective loading and dispersion of silicon onto carbon play an important role in improving the performance of anode materials. Herein, surface engineering of the hole-opening process was successfully achieved before the deposition of silicon. This resulted in fine holes on the carbon cloth, increasing the specific surface area to provide abundant confined spaces for dispersing nano-silicon. A composite structure was formed and structurally optimized by depositing an ultra-thin silicon layer in the holes of mesoporous carbon fiber cloth (DTSi/CC), improving the conductivity of the material, increasing the migration rate of lithium ions, and inhibiting the volume expansion of the anode material during the cycles. At 100 mA g-1, the fabricated half-cells achieved a reversible capacity of 1457 mA h g-1and retained 70.9% initial capacity after 100 cycles. Even when the current density was increased to 1.0 A g-1, they boasted a capacity of 1037 mA h g-1and had 76.8% capacity retention after 500 cycles. Free of binders and conductive additives, the DTSi/CC composite was directly used as the anode, exhibiting superior properties with high reversible specific capacity, excellent cyclic performance, and good rate capability. This study provides a straightforward, effective route to obtain high-performance silicon-based anode materials for lithium-ion batteries.

    DOI: 10.1021/acsaem.1c01049

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  • Recent progress in biomass-derived carbon materials used for secondary batteries 査読有り

    Chen Y., Guo X., Liu A., Zhu H., Ma T.

    Sustainable Energy and Fuels   5 ( 12 )   3017 - 3038   2021年06月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    With rapid economic development, utilization of energy storage is increasingly important. Carbon materials derived from biomass are widely applied in energy storage systems due to their inexpensive and environmentally friendly nature. Compared to other advanced anode materials that have been explored, biomass carbon materials have high specific surface areas, adjustable porous structures, and heteroatoms that facilitate ion transfer and diffusion. To date, a series of porous biomass-derived carbon materials prepared through various methods have been used as anode electrodes of secondary batteries which greatly promoted their capacities. In this paper, we summarize the morphology and pore structure of biomass-derived materials from different precursors and discuss the electrochemical performance of secondary batteries (LIBs, SIBs, KIBs and ASSLMBs) equipped with biomass-derived carbon materials including monomers and composites as anode electrodes. Current research challenges along with future prospects for carbon-based electrode materials to improve secondary battery energy storage performance are emphasized.

    DOI: 10.1039/d1se00265a

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  • A review on electrochemical synthesized copper-based catalysts for electrochemical reduction of CO<inf>2</inf> to C<inf>2+</inf> products 査読有り

    Ye W., Guo X., Ma T.

    Chemical Engineering Journal   414   2021年06月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    In recent decades, catalytic reduction of CO2 is a hot topic in the research field of electrocatalysis. Copper is the only metal catalyst capable of producing multiple carbon (C2+) products in electrocatalytic CO2 reduction (ECR), however, there are still many challenges such as low selectivity, serious hydrogen evolution (HER) and poor stability. So far, various synthesis methods have been developed for Cu-based catalysts. Compared with ordinary chemical synthesis, electrochemical method has the advantages of simple process, controllable conditions, good safety and eco-friendly. In this review, the recent progress in synthesizing different types of Cu-based catalysts by means of the electrochemical method are comprehensively reviewed. The engineering strategies and the effects of the key preparation conditions on the catalytic performance of CO2 electroreduction for C2+ products are discussed in details. Besides, copper-based catalysts synthesized by electrochemical methods combined with the ordinary methods (wet chemical methods, plasma activated methods and other methods) were also outlined. Finally, the development potential of electrochemical synthesis for Cu-based catalysts are recommended, which provides a direction for the future development of Cu-based catalysts with low cost and high ECR performance.

    DOI: 10.1016/j.cej.2021.128825

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  • Theoretical study of the influence of doped oxygen group elements on the properties of organic semiconductors 査読有り

    Liu A., Gao M., Ma Y., Ren X., Gao L., Li Y., Ma T.

    Nanoscale Advances   3 ( 11 )   3100 - 3106   2021年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Organic semiconductor materials are widely used in the field of organic electronic devices due to their wide variety, low price, and light weight. However, their developments are still restrained by their low stability and carrier mobility. Density functional theory (DFT) was used to study the influence of doped oxygen group elements (O, S, Se, and Te) on the properties of organic semiconductor materials (seven-membered benzothiophene,o-pentacene, thiophene derivatives, and pentacene) in this paper. Based on the calculation ofEHOMO,ELUMO, ΔE, and total energy, the performances of organic semiconductor materials without and with doped elements were compared, and it was found that the doping of multi-element Te makes the material have high stability and potential high mobility. For these studied organic semiconductor materials, when the atoms of the doped site change in the order of O, S, Se, and Te, the carrier mobility gradually increases, and the molecules show a tendency of stability. In this paper, promising doping elements and doping methods for these studied molecules are determined through calculations and screening out suitable materials more efficiently and economically without a large amount of repetitive experimental work, which may provide a theoretical basis and guidance for preparing high-performance organic semiconductor materials.

    DOI: 10.1039/d0na01026j

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  • Theoretical study of the influence of doped niobium on the electronic properties of CsPbBr<inf>3</inf> 査読有り

    Liang X., Ren X., Yang S., Liu L., Xiong W., Cheng L., Ma T., Liu A.

    Nanoscale Advances   3 ( 7 )   1910 - 1916   2021年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    In the family of inorganic perovskite solar cells (PSCs), CsPbBr has attracted widespread attention due to its excellent stability under high humidity and high temperature conditions. However, power conversion efficiency (PCE) improvement of CsPbBr -based PSCs is markedly limited by the large optical absorption loss coming from the wide band gap and serious charge recombination at interfaces and/or within the perovskite film. In this work, using density functional theory calculations, we systemically studied the electronic properties of niobium (Nb)-doped CsPbBr with different concentration ratios. As a result, it is found that doped CsPbBr compounds are metallic at high Nb doping concentration but semiconducting at low Nb doping concentration. The calculated electronic density of states shows that the conduction band is predominantly constructed of doped Nb. These characteristics make them very suitable for solar cell and energy storage applications. 3 3 3 3

    DOI: 10.1039/d0na01000f

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  • The sulfur-rich small molecule boosts the efficiency of carbon-based CsPbI<inf>2</inf>Br perovskite solar cells to approaching 14% 査読有り

    Han Q., Yang S., Wang L., Yu F., Zhang C., Wu M., Ma T.

    Solar Energy   216   351 - 357   2021年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    All-inorganic perovskite materials, typically CsPbI Br, have received widespread attention owing to their outstanding thermal stability than that of organic/inorganic hybrid counterparts. However, the power conversion efficiency (PCE) of CsPbI Br perovskite solar cell (PSC) is far lower than its theoretical value. In this study, to further improve the PCE, a sulfur-rich small molecule material (delta-2:2-bis (1,3-dithiazole)), is used to modify the interface between CsPbI Br and carbon electrode. Encouragingly, the carbon-based CsPbI Br PSCs achieve a high PCE of 13.78% than the control of 10.40%, which is the best performance of carbon-based CsPbI Br PSC among the literature report at present. The remarkable reduction of defect density and suppression recombination should be responsible for the PCE improvement. This work proposes a simple and effective strategy to enhance the efficiency of all-inorganic carbon-based CsPbI Br PSCs. 2 2 2 2 2 2

    DOI: 10.1016/j.solener.2021.01.030

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  • Investigation on the interfacial behavior of polyorganic inhibitors on a metal surface by DFT study and MD simulation 査読有り

    Liu A., Guan W., Zhao X., Ren X., Liang X., Gao L., Li Y., Ma T.

    Applied Surface Science   541   2021年03月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Metal corrosion is an important technical problem often encountered in industrial production in various fields. One of the efficient and economical methods to effectively block corrosion is to add a corrosion inhibitor, which forms a protective film on the metal surface. Accordingly, environmentally friendly organic corrosion inhibitors have become research hotspots in recent years. Among them, polyorganic substances have been proved to be effective corrosion inhibitors; however, research on this topic is still scarce. In this study, (poly) ethylene glycol and (poly) acrylamide are investigated as polyorganic inhibitors by density functional theory and molecular dynamic simulation, and the effect of the degree of polymerization (DP) on the adsorption behavior on metal surfaces is theoretically analyzed. On the basis of a comprehensive evaluation of their stability and adsorption energy, the optimal DPs of these two inhibitors are determined. This work may provide a theoretical basis and guidance for further research of corrosion inhibitor.

    DOI: 10.1016/j.apsusc.2020.148570

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  • Environmental risks and strategies for the long-term stability of carbon-based perovskite solar cells 査読有り

    Meng F., Zhou Y., Gao L., Li Y., Liu A., Zhang C., Fan M., Wei G., Ma T.

    Materials Today Energy   19   2021年03月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    The decent power conversion efficiency (~20%), ultra-low cost, and 1-year stability make carbon-based perovskite solar cells (C-PSCs) one of the most promising candidates for commercialization in the field of perovskite photovoltaics. However, the stability of C-PSCs still lags behind that of the commercialized silicon and thin-film photovoltaics. Although there have been many reviews of the long-term stability of perovskite solar cells (PSCs), none has specifically focused on the long-term stability of C-PSCs. Herein, we summarize the environmental risks and strategies for ensuring the long-term stability of C-PSCs, highlighting also the various contributions of our research group. The most important factors affecting long-term stability are analyzed according to the environmental risks (i.e. moisture, oxygen, light, and thermal stress) of device degradation. The proposed strategies chiefly center around improving the intrinsic stability and strengthening encapsulation. In our conclusions, we also present an outlook on future work concerning stability improvement and commercial development of C-PSCs. Our work provides a clear guideline for future research on C-PSCs.

    DOI: 10.1016/j.mtener.2020.100590

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  • Current progress of molybdenum carbide-based materials for electrocatalysis: potential electrocatalysts with diverse applications 査読有り

    Li Y., Yin Z., Liu X., Cui M., Chen S., Ma T.

    Materials Today Chemistry   19   2021年03月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    Electrocatalysts are the cores of many electrochemical reactions including hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), nitrogen reduction reaction (NRR), and CO2 reduction reaction (CO2RR). Recent advances in research have demonstrated the potentials of molybdenum carbide-based catalysts for these reactions arising out of their unique electronic structure and physicochemical properties. In this review, we systematically summarize the recent advances of molybdenum carbide-based catalysts in these electrochemical processes. The corresponding synthesis strategies, structure and electrocatalytic performance of the catalysts are discussed and the relationships of the process-structure-property are highlighted. In addition, the catalytic mechanisms are analyzed based on the structure characterization and theoretical calculations results. Finally, the existing challenges and future perspectives are put forward for further development of molybdenum carbide-based catalysts.

    DOI: 10.1016/j.mtchem.2020.100411

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  • Density functional theory study of nitrogen-doped graphene as a high-performance electrocatalyst for CO<inf>2</inf>RR 査読有り

    Liu A., Guan W., Wu K., Ren X., Gao L., Ma T.

    Applied Surface Science   540   2021年02月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Metal-free catalysts for the CO2 reduction reaction (CO2RR) is a research hotspot to enhance CO2 utilization as a way to counteract global warming. Nitrogen-doped graphene attracts attention because of the abundance of nitrogen and promising catalytic performance of graphene. In this work, we investigated various N-doped configurations and their corresponding catalytic abilities for CO2RR to ethanol via spin-polarized density functional theory (DFT) computations. The final results indicate that site 43 of binary-N-doped graphene had high CO2RR activity, stable adsorption of reactants, and good activation of CO2. The catalysis process demonstrated features of low free energy barriers in the rising stage and obvious facilitation of the potential-limiting step. Compared with a catalyst-free process, it can effectively improve the reaction activity. The results provide theoretical guidance for the design and preparation of high-performance CO2RR catalysts.

    DOI: 10.1016/j.apsusc.2020.148319

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  • 9,10-Anthraquinone/K<inf>2</inf>CuFe(CN)<inf>6</inf>: A highly compatible aqueous aluminum-ion full-battery configuration 査読有り

    Yan L., Zeng X., Zhao S., Jiang W., Li Z., Gao X., Liu T., Ji Z., Ma T., Ling M., Liang C.

    ACS Applied Materials and Interfaces   13 ( 7 )   8353 - 8360   2021年02月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Temporally intermittent and spatially dispersed renewable energy sources strongly call for large-scale energy storage devices. Aqueous aluminum-ion batteries show great potential for application due to their safety and low cost. Thus far, however, the ideal full-battery configuration is beyond the scope due to shortcomings with regards to suitable anode and cathode materials. Herein, we report a pioneering aqueous aluminum-ion battery system consisting of a Prussian white cathode, 1 M Al2(SO4)3 aqueous electrolyte, and an organic 9,10-anthraquinone anode. The oxidation capability of the Prussian white cathode during the first charging allows for the fabrication of the full battery without pre-inserting aluminum ions, thus making the rocking-chair-type battery feasible. Importantly, the open-framework structure of the Prussian white and distinct enolization charge storage mechanism of 9,10-anthraquinone ensure fast reaction kinetics. The full battery exhibits cycling stability with a capacity retention of 89.1% over 100 cycles at 500 mA g−1, finishing a cycle in about 10 min. This work provides a pathway for developing rechargeable aqueous aluminum-ion batteries.

    DOI: 10.1021/acsami.0c20543

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  • A peanut shell-derived economical and eco-friendly biochar catalyst for electrochemical ammonia synthesis under ambient conditions: combined experimental and theoretical study 査読有り

    Liu A., Yang Y., Ren X., Gao M., Liang X., Ma T.

    Catalysis Science and Technology   11 ( 4 )   1526 - 1536   2021年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The electrochemical conversion of nitrogen (N ) to ammonia (NH ) under ambient conditions is a highly promising alternative to the energy-intensive Haber-Bosch process. However, it suffers from poor yields and selectivity because of the lack of efficient catalysts. Herein, we prepared an economical and eco-friendly efficient biochar catalyst from peanut shells and achieved a high ammonia yield (2.32 μmol h cm ) and selectivity (faradaic efficiency of 26.97%) over 12 h of stable operation. The results of density functional theory calculations illustrate that association pathways are more likely to occur on the active sites Bio-N4, Bio-O37, and Bio-S58, while dissociation pathways always occurred on the active sites Bio-O15, Bio-O21, and Bio-O52. Furthermore, Bio-O21 is the most promising active site for the NRR following the NNH dissociation pathway with a lower reaction barrier. The preferable adsorption of N , desorption of NH , and suppression of the HER demonstrated the peanut shell-derived material as a more promising catalyst for the NRR. 2 3 2 2 3 −1 −2

    DOI: 10.1039/d0cy01824d

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  • A two-dimensional MXene-supported metal-organic framework for highly selective ambient electrocatalytic nitrogen reduction 査読有り

    Liang X., Ren X., Yang Q., Gao L., Gao M., Yang Y., Zhu H., Li G., Ma T., Liu A.

    Nanoscale   13 ( 5 )   2843 - 2848   2021年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The conversion of nitrogen into ammonia is crucial for human activities. The electrochemical synthesis of ammonia from nitrogen and water is a green process with great application prospects; to this end, much effort has been made to improve the catalytic activity and selectivity. Here, a Co-based metal-organic framework (MOF), that is, zeolitic imidazolate framework-67 (ZIF-67), supported on a Ti3C2 MXene (defined as ZIF-67@Ti3C2) was prepared via in situ growth. Due to the high porosity and large active surface area of the MOF and the superior conductivity of the Ti3C2 MXene, the composite could efficiently synthesize ammonia electrochemically. In particular, the prepared ZIF-67@Ti3C2 catalyst exhibited an excellent NH3 yield (6.52 μmol h-1 cm-2), significantly higher than those achieved by Ti3C2 and ZIF-67 (2.77 and 1.61 μmol h-1 cm-2, respectively) alone, and good Faraday efficiency (20.2%) at -0.4 V (vs. the reversible hydrogen electrode). This study not only expands the application of the MXene family in the electrochemical nitrogen reduction reaction but also provides ideas for the development of high-performance electrocatalysts for NRR. This journal is

    DOI: 10.1039/d0nr08744k

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  • Interface engineering of transitional metal sulfide-MoS<inf>2</inf>heterostructure composites as effective electrocatalysts for water-splitting 査読有り

    Li Y., Yin Z., Cui M., Liu X., Xiong J., Chen S., Ma T.

    Journal of Materials Chemistry A   9 ( 4 )   2070 - 2092   2021年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    Benefiting from the high electrochemical surface area brought by the 2D nanosheet structure, MoS has received great research attention for the hydrogen evolution reaction (HER). Recently, it has been demonstrated that by constructing a transitional metal sulfide-MoS heterostructure, the HER performance of the MoS -based catalysts can be further improved. It is even possible to obtain bifunctional catalysts for both HER and oxygen evolution reaction (OER) due to the synergistic effect of the different components in the composite, the electronic effect to enable an efficient electron transfer and appropriate binding energy for the intermediates of the electrocatalytic reactions, and the surface defects on the interface of the heterostructures. Herein, we review the recent progress on the construction of the transitional metal sulfide-MoS heterostructure for water splitting based on non-self-supporting and self-supporting catalysts. The surface and interface parameters of the heterostructures are discussed in detail to reveal the key roles of the hybrid structures for energy conversion. We also pay special attention to the theoretical simulations based on first principles to clarify the relationships between the electrochemical performance and structure parameters. Finally, the prospects and challenges of the transition metal sulfide-MoS heterostructures for water splitting in the future are proposed to prompt the reasonable design of transition metal sulfide-MoS heterostructures for full water splitting. 2 2 2 2 2 2

    DOI: 10.1039/d0ta10815d

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  • DFT study of the defective carbon materials with vacancy and heteroatom as catalyst for NRR 査読有り

    Liu A., Yang Y., Kong D., Ren X., Gao M., Liang X., Yang Q., Zhang J., Gao L., Ma T.

    Applied Surface Science   536   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Ammonia (NH3) is recognized as a chemical substance that is very important for the development of human society. At present, the traditional industrial synthetic ammonia process is Haber-Bosch, which has some shortcomings such as low conversion rate, high energy consumption and greenhouse gas emission. Therefore, the search for new synthetic ammonia methods has attracted the attention of many scientific researchers. In this work, we use density functional theory (DFT) to explore vacancy and heteroatom (N, S) doped defective carbon materials suitable for catalyzing nitrogen reduction reaction (NRR). The introduction of vacancy defect, N or S atom doping graphene can improve the reactivity of graphene. In addition, the high activity sites of defective graphene mainly distribute on the carbon atoms at the upper left edge, the right edge and the lower edge. The research results theoretically determine the effect of different doping methods, doping positions and quantities on material properties, and provide theoretical basis and guidance for exploring new carbon catalysts.

    DOI: 10.1016/j.apsusc.2020.147851

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  • Recent Progress in MXene-Based Materials for Metal-Sulfur and Metal-Air Batteries: Potential High-Performance Electrodes 査読有り

    Liu A., Liang X., Ren X., Guan W., Ma T.

    Electrochemical Energy Reviews   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    Abstract: Rechargeable batteries, which are used for renewable energy storage, have paved the way for reducing the enormous pressure of the energy crisis and environmental pollution. Recently, promising electrode materials with high energy and power density and favorable electrochemical performance for energy conversion and storage have been developed to meet the ever-growing demand for renewable power for electric vehicles or grid applications. MXenes, which constitute an impressive two-dimensional transition metal carbide/carbonitride family, exhibit great energy storage potential based on their ideal specific surface area, excellent electrical conductivity, and superior chemical durability in batteries. The recent advances in MXenes and their composites for metal-sulfur batteries (specifically lithium-sulfur and sodium-sulfur batteries) and metal-air batteries (specifically lithium-air and zinc-air batteries) are comprehensively and systematically summarized in this review. Furthermore, the performance management strategies, next-stage research prospects, and remaining practical challenges for MXene-based materials in battery applications are discussed in detail. This review may provide some guidance for the development and application of MXene-based electrode materials in renewable electrochemical energy storage. Graphic Abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s41918-021-00110-w

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  • Recent Progress in Perovskite Solar Cells Modified by Sulfur Compounds 査読有り

    Zhou Y., Liu C., Meng F., Zhang C., Wei G., Gao L., Ma T.

    Solar RRL   2021年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    In the past decade, organic–inorganic hybrid perovskite solar cells (PSCs) have begun to be increasingly studied worldwide owing to the superior properties of perovskite material. However, some issues have delayed their commercialization, such as their long-term stability, cost reduction, scale-up ability, and efficiency. The introduction of sulfur to PSCs can relieve the above issues because sulfur can passivate interfacial trap states, suppress charge recombination, and inhibit ion migration, thereby enhancing the stability of PSCs. Furthermore, Pb-S bonds provide new channels for carrier extraction. Herein, the sulfur-based compounds utilized in PSCs are summarized and classified according to their functions in the different layers of PSCs. The results indicate that these sulfur-based compounds have efficiently promoted the commercialization of PSCs. It is hoped that this review can help others understand the intrinsic phenomena of sulfur-based PSCs and motivate additional investigations.

    DOI: 10.1002/solr.202000713

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  • Theoretical study of the mechanism of methanol oxidation on PtNi catalyst 査読有り

    Liu A., Yang Y., Shi D., Ren X., Ma T.

    Inorganic Chemistry Communications   123   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The anodic methanol oxidation reaction (MOR) generates a toxic intermediate CO in direct methanol fuel cell (DMFC), where the Pt catalyst is easily deactivated and the catalytic activity will be inevitably lowered. Alloying modification is an important approach to improve the anti-CO ability of Pt catalyst. In this work, MOR mechanism on PtNi catalyst is theoretically studied on four crystal planes doped with one-to-three Ni atoms. The main path of CO poisoning on the catalyst surface: CH3OH → CH2OH → CHOH → CHO → CO was studied. Meanwhile, the adsorption of PtNi catalyst on the reaction intermediate was carried out. Based on the relative energy ΔE, the four optimal catalysts were compared for MOR. Building on the above comprehensive evaluations the appropriate catalysts were finally selected by the activation effect. It is proved by calculation that the selected 1,2,3Ni-Pt (2 0 0) reduces the relative energy of the overall reaction path, possessing good catalytic effect on MOR with certain anti-CO toxicity.

    DOI: 10.1016/j.inoche.2020.108362

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  • Electrocatalytic Synthesis of Ammonia Using a 2D Ti<inf>3</inf>C<inf>2</inf> MXene Loaded with Copper Nanoparticles 査読有り

    Liu A., Liang X., Yang Q., Ren X., Gao M., Yang Y., Ma T.

    ChemPlusChem   86 ( 1 )   166 - 170   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    As an energy-saving and environmentally friendly ammonia synthesis method, electrocatalytic nitrogen reduction reaction (NRR) has received a great deal of attention. There is thus an urgent need to find high-efficiency electrocatalysts for the NRR. In this work, a Cu/Ti3C2 composite catalyst was prepared and demonstrated excellent selectivity under environmental conditions, which could efficiently convert N2 into NH3 electrochemically. In 0.1 M KOH, Cu/Ti3C2 can achieve a high Faradaic efficiency of 7.31 % and a high NH3 production rate of 3.04 μmol h−1 cm−2 at −0.5 V vs. RHE. Moreover, the material also exhibits superior electrochemical stability and durability. At the same time, density functional theory (DFT) shows that, compared with Ti3C2, Cu/Ti3C2 exhibits a wider conduction and valence band and a larger Fermi level, thus indicating that Cu plays a vital role in the enhancement of the catalytic activity and conductivity of Ti3C2-based materials. This work provides a feasible strategy for designing high-efficiency MXene-based NRR electrocatalysts.

    DOI: 10.1002/cplu.202000702

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  • Bimetallic Sulfide SnS<inf>2</inf>/FeS<inf>2</inf>Nanosheets as High-Performance Anode Materials for Sodium-Ion Batteries 査読有り

    Chen Y., Liu H., Guo X., Zhu S., Zhao Y., Iikubo S., Ma T.

    ACS Applied Materials and Interfaces   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Transition-metal sulfide SnS2 has aroused wide concern due to its high capacity and nanosheet structure, making it an attractive choice as the anode material in sodium-ion batteries. However, the large volume expansion and poor conductivity of SnS2 lead to inferior cycle stability as well as rate performance. In this work, FeS2 was in situ introduced to synchronously grow with SnS2 on rGO to prepare a heterojunction bimetallic sulfide nanosheet SnS2/FeS2/rGO composite. The composition and distinctive structure facilitate the rapid diffusion of Na+ and improve the charge transfer at the heterogeneous interface, providing sufficient space for volume expansion and improving anode materials' structural stability. SnS2/FeS2/rGO bimetallic sulfide electrode boasts a capacity of 768.3 mA h g-1 at the current density of 0.1 A g-1, and 541.2 mA h g-1 at the current density of 1 A g-1 in sodium-ion batteries, which is superior to that of either single metal sulfide SnS2 or FeS2. TDOS calculation further confirms that the binding of FeS2/SnS2-Na is more stable than FeS2 and SnS2 alone. The superior electrochemical performance of the SnS2/FeS2/rGO composite material makes it a promising candidate for sodium storage.

    DOI: 10.1021/acsami.1c08801

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  • Surface Management for Carbon-Based CsPbI<inf>2</inf>Br Perovskite Solar Cell with 14% Power Conversion Efficiency 査読有り

    Yu F., Han Q., Wang L., Yang S., Cai X., Zhang C., Ma T.

    Solar RRL   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Carbon-based hole transport material (HTM)-free CsPbI2Br perovskite solar cells (C-PSCs) have garnered considerable attention due to their super thermal stability. The energy-level mismatch between the CsPbI2Br perovskite and carbon electrodes, however, results in major energy loss and reduced power conversion efficiency (PCE) of C-PSCs. Herein, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) is used to manage the energy level, reduce defect densities, and improve the interface quality between CsPbI2Br and carbon electrodes. Preliminary results demonstrate that the BMIMBF4 modifier can passivate the surface defects of the perovskite film and reduce the energy-level mismatch between the CsPbI2Br layer and the carbon electrode. A PCE of 14.03% is achieved by introducing BMIMBF4 which is improved by 23% compared with the control device (11.37%). Moreover, stability—whether in the case of C-PSCs or CsPbI2Br films—is also improved.

    DOI: 10.1002/solr.202100404

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  • Recent Progresses in Carbon Counter Electrode Materials for Perovskite Solar Cells and Modules 査読有り

    Xu C., Zhao X., Ma J., Guo J., Ma T., Wu M.

    ChemElectroChem   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    Though perovskite solar cells (PSCs) or modules (PSMs) are being developed at an unprecedented speed, several obstacles remain to their commercialization. One of the difficult problems is the expensive and unstable Au and Ag counter electrode. Therefore, highly effective, stable, and low-cost counter electrode materials should be explored. Among various counter electrode materials, carbon is one of the most promising substitutes for their rich sources, low cost, outstanding electrochemical performance, and diversified surface functions. This review summarizes recent achievements of carbon counter electrode materials, which included commercial carbon paste, carbon black, graphite, graphene, carbon nanotubes and their synthetic approaches, modifications, and structure-function relationships. Moreover, large-scale carbon counter electrode in PSCs or PSMs are specifically discussed. Hopefully, this recapitulative analysis will draw the attention of relevant researchers to re-understand the importance of counter electrode and clarify what should be noticed to develop qualified counter electrode materials for PSCs or PSMs.

    DOI: 10.1002/celc.202100811

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  • Mechanism of Enhancement in Perovskite Solar Cells by Organosulfur Amine Constructed 2D/3D Heterojunctions 査読有り

    He Z., Zhou Y., Xu C., Su Y., Liu A., Li Y., Gao L., Ma T.

    Journal of Physical Chemistry C   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Constructing a 2D/3D heterojunction perovskite that could remain highly efficient and improve the stability of perovskite solar cells (PSCs) is explored. In this paper, we compared 2D/3D heterojunction perovskite films passivated by organosulfur and commonly used organic amine salts. Results indicated that the perovskite film passivated by organosulfur amine salts had a lower trap state density, longer carrier lifetime, improved energy level alignment, and higher thermal and moisture stability. An approximate 21% power conversion efficiency (PCE) was obtained in the champion device. After the comparison, the passivation mechanism of the organosulfur 2D/3D heterojunction was proposed.

    DOI: 10.1021/acs.jpcc.1c04343

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  • Double shelled hollow CoS<inf>2</inf>@MoS<inf>2</inf>@NiS<inf>2</inf> polyhedron as advanced trifunctional electrocatalyst for zinc-air battery and self-powered overall water splitting 査読有り

    Liu X., Yin Z., Cui M., Gao L., Liu A., Su W.N., Chen S., Ma T., Li Y.

    Journal of Colloid and Interface Science   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electrocatalysts play important role in various energy conversion and storage devices. The catalytic performance of electrocatalysts can be enhanced through the increasement of intrinsic catalytic activity by optimizing electronic structure and the improvement of exposed active sites by designing proper nanostructures. In this work, CoS2@MoS2@NiS2 nano polyhedron with double-shelled structure was prepared using metal organic framework as a precursor. Due to the rational integration of multifunctional active center, the strong electronic interaction of the various component, the high electrochemical surface area and shortened mass transport induced by the special structure, CoS2@MoS2@NiS2 exhibits high catalytic activity for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Specifically, low overpotentials of 156 and 200 mV was achieved to deliver a current density of 10 mA cm−2 for HER and OER, and a high half-wave potential of 0.80 V was observed for ORR. More importantly, the Zn-air battery assembled by CoS2@MoS2@NiS2 exhibits a high-power density of 80.28 mW cm−2 and could effectively drive overall water splitting. This work provides a new platform for designing multifunctional catalysts with high activity for energy conversion and storage.

    DOI: 10.1016/j.jcis.2021.11.115

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  • Two-Dimensional Cu<inf>2</inf>MoS<inf>4</inf>-Loaded Silicon Nanospheres as an Anode for High-Performance Lithium-Ion Batteries 査読有り

    Liu H., Chen Y., Zhao Y., Liu K., Guo X., Meng X., Ma T.

    ACS Applied Energy Materials   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Silicon-based anode materials have a theoretical capacity 10 times that of commercial graphite and have attracted attention. Herein, a creative and effective strategy is elaborated for the synthesis of composite Cu2MoS4/SiNS materials through the self-assembly of silicon nanospheres and a two-dimensional Cu2MoS4 material. The porous silicon dispersed in the two-dimensional layered structure can effectively release the volume expansion and mechanical stress generated, which can also provide further active sites and fast channels for Li+ transmission, and improve the conductivity of the material. As expected, when used as the anode of lithium-ion batteries, the Cu2MoS4/SiNS material exhibited a highly improved electrochemical performance. Benefitting from the unique structural features, the Cu2MoS4/SiNS material showed a discharge specific capacity of 1920 mAh g-1 at 100 mA g-1 and an excellent rate capability of 1330 mAh g-1 at 1.0 A g-1 after 100 cycles. When the current density was further increased to 2.0 A g-1 to test the fast charging performance of the Cu2MoS4/SiNS material, we obtained a specific capacity of 1180 mAh g-1 with 69.2% capacity retention that could still be maintained after 400 cycles. The ultrastable properties and superior capacity of the composite material provide the potential direction for the construction of high-performance lithium-ion batteries.

    DOI: 10.1021/acsaem.1c02697

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  • Highly Reversible Zn Metal Anode Stabilized by Dense and Anion-Derived Passivation Layer Obtained from Concentrated Hybrid Aqueous Electrolyte 査読有り

    Olbasa B.W., Huang C.J., Fenta F.W., Jiang S.K., Chala S.A., Tao H.C., Nikodimos Y., Wang C.C., Sheu H.S., Yang Y.W., Ma T.L., Wu S.H., Su W.N., Dai H., Hwang B.J.

    Advanced Functional Materials   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Zinc metal is considered a promising anode material for aqueous zinc ion batteries. However, it suffers from dendrite growth, corrosion, and low coulombic efficiency (CE) during plating/stripping. Herein, a concentrated hybrid (4 m Zn(CF3SO3)2 + 2 m LiClO4) aqueous electrolyte (CHAE) to overcome the challenges facing the Zn anode is reported. The developed electrolyte achieves dendrite-free Zn plating/stripping and obtains an excellent CE of ≈100%, surpassing the previously reported values. The combination of synchrotron-based in operando transmission X-ray microscopy, X-ray diffraction, and ex situ X-ray photoelectron spectroscopy analyses indicate that the denser, anion-derived passivation layer formed using the CHAE facilitates homogeneous current distribution and better prevents freshly deposited Zn from directly contacting the electrolyte than the looser, solvent-derived layers formed from a dilute hybrid aqueous electrolyte (DHAE). The beneficial effects of the CHAE on the compact, dense, and stable salt-anion-derived passivation layer can be attributed to its unique solvation structure, which suppresses the water-related side reactions and widens the electrochemical potential window. In the hybrid Zn||LiFePO4 configuration, the CHAE-based cell delivered a stable performance of CE >99% and capacity retention >90% after 285 cycles. In contrast, the DHAE-based cell exhibits capacity retention of <65% after 170 cycles.

    DOI: 10.1002/adfm.202103959

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  • Carrier Transport Layer-Free Perovskite Solar Cells 査読有り

    Wang L., Yang S., Han Q., Yu F., Zhang H., Cai X., Zhang C., Gao L., Ma T.

    ChemSusChem   2021年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Power conversion efficiencies (PCEs) of up to 25.5 % have been reported for perovskite solar cells (PSCs). Thus, they have shown great potential for commercial applications. Therefore, simplifying technological process and reducing production costs have been a widespread concern among scientific and industrial communities. In this study, PSCs are prepared with the simplest device architecture (FTO/MAPbI3/carbon). A high-quality perovskite film with few interface defects and good carrier transport is obtained by tuning the p-n properties, matching energy levels, and enhancing carrier collection and transport. A PCE of 12.01 % is achieved, which is the best reported to date for this device structure. The device also shows excellent long-term stability, owing to the elimination of charge transport layers and the usage of hydrophobic materials. This study provides a new approach to reduce production costs and simplify production of PSCs.

    DOI: 10.1002/cssc.202101592

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  • Metal-Organic-Framework-Derived Cobalt-Doped Carbon Material for Electrochemical Ammonia Synthesis under Ambient Conditions 査読有り

    Liu A., Liang X., Yang Q., Ren X., Gao M., Yang Y., Ma T.

    ChemElectroChem   7 ( 24 )   4900 - 4905   2020年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electrocatalytic nitrogen reduction reaction (NRR), as a potential alternative to industrial ammonia synthesis (Haber-Bosch method), can achieve “green” and sustainable ammonia production under environmental conditions. However, the NRR process is still limited by the slow cleavage of the N≡N triple bond and the existence of a competitive hydrogen evolution reaction. For this reason, many researchers have studied the construction and synthesis of high-efficiency nitrogen reduction electrocatalysts. Herein, a Co-based metal-organic framework (ZIF-67) was used to prepare Co/C-900 composites through high-temperature pyrolysis (900 °C) for ammonia synthesis under environmental conditions. The Co/C-900 catalysts exhibited excellent NRR performance, with a high NH3 yield of 4.66 μmol cm−2 h−1 at −0.3 V (vs. RHE) and a faradaic efficiency of 11.53 % in 0.1 M potassium hydroxide. This work provides a simple strategy for the design of porous, non-noble-metal electrocatalysts for electrochemical NRR.

    DOI: 10.1002/celc.202001332

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  • Hierarchical porous architectures derived from low-cost biomass equisetum arvense as a promising anode material for lithium-ion batteries 査読有り

    Chen Y., Liu H., Jiang B., Zhao Y., Meng X., Ma T.

    Journal of Molecular Structure   1221   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Biomass-derived carbonaceous materials as anodes for Lithium-ion batteries have been paid much attention due to the low cost and Environmental-friendly. So far, Equisetum Arvense (EQ), wide grass as anode electrodes of Li-ion battery has not been reported. The Equisetum Arvense (>30 wt% silica) is one of the highest Si accumulators in the plant kingdom with a widely distributed and strong reproductive ability. In this work, we used ZnCl2 as an activator during carbonization and obtained a hierarchically porous structure with a high specific surface area. When taken as an anode in Li-ion batteries, it exhibits remarkable capacities (773 mA h g−1 at 0.1 A g−1) following 100 cycles and desirable rate performance (472 mA h g−1 at 1 A g−1). The hierarchical structure and naturally dispersed carbon network in this SiOx/C composite can provide stable solid electrolyte interphase, maintain its structural integrity and improve the electronic and ionic conductivity, thus ensuring an excellent electrochemical performance. The proposed SiOx/C composite has a bright future for next-generation LIBs anodes with environmental-friendly and large-scale (low-cost) production.

    DOI: 10.1016/j.molstruc.2020.128794

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  • Bimetallic cobalt molybdenum carbide–cobalt composites as superior bifunctional oxygen electrocatalysts for Zn–air batteries 査読有り

    Li Y., Yin Z., Cui M., Chen S., Ma T.

    Materials Today Energy   18   2020年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Designing composite material that contains high-active oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) species is an effective strategy for synthesizing bifunctional electrocatalysts for Zn–air batteries. In this work, we first reported the preparation of the Co6Mo6C2–Co@NC nanorod composite by using the Mo-polydopamine@ZIF-67 composite as the precursor. Because of the highly active Co6Mo6C2 for OER and the high-active Co for ORR, the Co6Mo6C2–Co@NC exhibits superior OER activity, with a low overpotential of 268 mV at 10 mA cm−2, and high ORR performance. When used as bifunctional electrocatalysts for the Zn–air battery, the battery exhibits a high open-circuit voltage of 1.38 V and a specific capacity of 760 mA/h/g, as well as very high stability of up to 300 h with no obvious increase in charge–discharge voltage gap.

    DOI: 10.1016/j.mtener.2020.100565

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  • Metal-organic framework based bifunctional oxygen electrocatalysts for rechargeable zinc-air batteries: Current progress and prospects 査読有り

    Li Y., Cui M., Yin Z., Chen S., Ma T.

    Chemical Science   11 ( 43 )   11646 - 11671   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 The Royal Society of Chemistry. Zinc-air batteries (ZABs) are regarded as ideal candidates for next-generation energy storage equipment due to their high energy density, non-toxicity, high safety, and environmental friendliness. However, the slow oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics on the air cathode limit their efficiency and the development of highly efficient, low cost and stable bifunctional electrocatalysts is still challenging. Metal-Organic Framework (MOF) based bifunctional oxygen electrocatalysts have been demonstrated as promising alternative catalysts due to the regular structure, tunable chemistry, high specific surface area, and simple and easy preparation of MOFs, and great progress has been made in this area. Herein, we summarize the latest research progress of MOF-based bifunctional oxygen electrocatalysts for ZABs, including pristine MOFs, derivatives of MOFs and MOF composites. The effects of the catalysts' composites, morphologies, specific surface areas and active sites on catalytic performances are specifically addressed to reveal the underlying mechanisms for different catalytic activity of MOF based catalysts. Finally, the main challenges and prospects for developing advanced MOF-based bifunctional electrocatalysts are proposed.

    DOI: 10.1039/d0sc04684a

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  • Comparison of interfacial bridging carbon materials for effective carbon-based perovskite solar cells 査読有り

    Gao L., Hu J., Meng F., Zhou Y., Li Y., Wei G., Ma T.

    Journal of Colloid and Interface Science   579   425 - 430   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Elsevier Inc. As a hole transport materials (HTMs) and noble-metal free perovskite solar cells (PSCs), carbon-based PSCs (C-PSCs) have drawn much attention due to its low cost and excellent stability. The interfacial engineering, between perovskite and counter electrodes (CEs), played a crucial role in charge collection and affected the performance of C-PSCs. Herein, the systematic investigation of interfacial bridging carbon materials has been carried out to improve the interfacial contact. Results demonstrated that the morphology of interfacial bridging carbon materials played more important role than their energy band and conductivity, where carbon nanotube (CN) showed much better interfacial bridging effect and energy level alignment than other carbon materials. We achieved both the high power conversion efficiency (PCE) (15.09%) and stability in C-PSCs without HTMs due to the optimal interfacial bridging carbon material. It could retain 67% of their initial PCE after storing for 340 h under the rigorous environmental condition without any encapsulation (air atmosphere, 85 °C, 65% RH).

    DOI: 10.1016/j.jcis.2020.06.090

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  • Bifunctional organic disulfide for high-efficiency and high-stability planar perovskite solar cells 査読有り

    Wang L., Yang S., Han Q., Yu F., Cai X., Liu F., Zhang C., Ma T.

    ACS Applied Energy Materials   3 ( 10 )   9724 - 9731   2020年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    In this study, we used a bifunctional organic disulfide, di-5-(1-methyltetrazole) disulfide (T2), in perovskite films to improve the performance and stability of planar perovskite solar cells (PSCs). The results indicate two major functions of T2 in PSCs: improving the perovskite crystal quality due to the interaction between T2 and perovskite and eliminating Pb0 and I0 defects by redox reaction, allowing for the regeneration of T2 in the process. We achieved a power conversion efficiency (PCE) of PSCs with T2 of 20.67%, a 15% increase compared to the control device (17.9%). Furthermore, PSC devices with T2 exhibited enhanced operational stability and storage stability. During 140 s of operation, there was no evident decrease of PCE. The device maintained 95% of its initial efficiency without encapsulation under ambient conditions (20 °C, 40% humidity) for 2 months.

    DOI: 10.1021/acsaem.0c01329

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  • Novel Lead-Free Material Cs<inf>2</inf>PtI<inf>6</inf>with Narrow Bandgap and Ultra-Stability for Its Photovoltaic Application 査読有り

    Yang S., Wang L., Zhao S., Liu A., Zhou Y., Han Q., Yu F., Gao L., Zhang C., Ma T.

    ACS Applied Materials and Interfaces   12 ( 40 )   44700 - 44709   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2020 American Chemical Society. Lead halide perovskite has in recent years gained widespread interest due to its excellent physical and chemical properties, as well as superior optoelectronic performance. However, some restrictions still preclude full industrialization of the material, in particular toxicity issues and instability as a result to sensitivity to humidity. Lead-free all-inorganic double perovskite materials have thus recently become a focus of research. Herein, a new narrow bandgap lead-free double perovskite solar cell with a high-quality Cs2PtI6 film is proposed. It exhibits an optical bandgap of 1.37 eV, absorption within a wide range of wavelengths, and a high absorption coefficient. Following optimization, the device displays a best power conversion efficiency of 0.72% with an open-circuit voltage of 0.73 V, a short-circuit current of 1.2 mA/cm2, and a fill factor of 0.82. Crucially, it also demonstrates excellent stability when exposed to extreme conditions such as high humidity, high temperature, and UV-light irradiation. Stability tests show that the PSCs can retain almost 80% of the original efficiency over 60 days stored in ambient temperature without any encapsulation, boosting prospects for applications of lead-free perovskite solar cells.

    DOI: 10.1021/acsami.0c11429

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  • DFT study of Ru/graphene as high-performance electrocatalyst for NRR 査読有り

    Liu A., Gao M., Gao Y., Ren X., Yang Y., Yang Q., Li Y., Gao L., Liang X., Ma T.

    Inorganic Chemistry Communications   120   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Elsevier B.V. As a more common catalyst material in nitrogen reduction reactions (NRR), Ru has high activity and considerable catalytic performance, but it is expensive with scarce reserves. These factors limit the development of Ru in NRR, how to reduce costs and increase the utilization of precious metals is a problem facing the development of Ru-based catalysts. Graphene is considered as a promising carrier material, which can increase the specific surface area and dispersibility of the catalyst, thereby improving the utilization rate of materials. Therefore we combined these two materials and studied the mechanism of NRR occurred on Ru/graphene (Gr) catalysts by density functional theory (DFT) method. The effects of different numbers of Ru atoms and Ru atom distribution on the catalytic activity of Ru/Gr catalyst were calculated. A series of data such as the adsorption free energy and reaction path were obtained. The final results show that the double Ru supported graphite nitrogen doped Gr with single adsorption process and the three Ru supported pyrrole nitrogen doped Gr with double adsorption process have the best NRR activity. Compared with catalyst-free process, the presence of the catalyst effectively reduces the reaction energy barrier and improves the reaction activity. The research results provide guidance for the design and preparation of high-performance NRR catalysts to a certain extent.

    DOI: 10.1016/j.inoche.2020.108169

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  • Two-dimensional CuAg/Ti<inf>3</inf>C<inf>2</inf>catalyst for electrochemical synthesis of ammonia under ambient conditions: a combined experimental and theoretical study 査読有り

    Liu A., Yang Q., Ren X., Gao M., Yang Y., Gao L., Li Y., Zhao Y., Liang X., Ma T.

    Sustainable Energy and Fuels   4 ( 10 )   5061 - 5071   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry 2020. The Haber-Bosch process is one of the most widely utilized approaches for the synthesis of ammonia, and has many disadvantages, such as the high energy consumption and generation of large amounts of greenhouse gases. Therefore, the electrochemical nitrogen reduction reaction (NRR) has received significant attention, as it is more sustainable and environmentally friendly. In this study, we report a CuAg/Ti3C2MXene catalyst for the electrocatalytic NRR. This MXene-based composite material exhibits remarkable performance for electrochemical synthesis of ammonia under ambient conditions. When measured in a 0.1 M KOH solution at an applied potential of −0.5 Vvs.reversible hydrogen electrode (RHE), the catalyst achieved an ammonia production rate and faradaic efficiency of 4.12 μmol cm−2h−1and 9.77%, respectively. These values indicate excellent stability and selectivity compared with the previously reported 2D NRR electrocatalysts. Moreover, the results of density functional theory calculations illustrate that with preferable adsorption of N2, desorption of NH3, and suppression of the HER, CuAg/Ti3C2is a promising catalyst for the NRR. The excellent electrical conductivity and fast electron transport in the CuAg/Ti3C2catalyst are favorable for the evaluated electrocatalytic reaction. Both experimental results and DFT calculations reveal that CuAg plays a crucial role in the catalytic activity and electrical conductivity enhancement for Ti3C2based materials.

    DOI: 10.1039/d0se00915f

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  • A facile and general procedure to hyperporous carbons: carbonization of organic zinc salts 査読有り

    Chen S., Huang H., Li Y., Ma T.

    Materials Today Energy   17   2020年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Elsevier Ltd A facile, one step procedure is proposed to prepare hyperporous carbons by using zinc organic salts as precursors. The volatile character of zinc at high temperature not only leads to high specific surface area, but also avoids the post-washing step after carbonization. The pore texture of the carbons can be easily turned by using different precursor and the factors that affect the porosity are examined in detail. It is found that a precursor with a high Zn/C ratio and chain-like structure tends to form high specific surface area carbons. The carbons show high potential when used for CO2 capture and electrode material of supercapacitor. Especially for Zn–C–C derived from zinc citrate, shows a high specific surface area of 2933 cm3 g−1, a high CO2 uptake of 88 cm3 g−1 at 298 K and a high capacitance of 260 F g−1 at a current density of 1 A g−1. We believe that by choosing proper Zn organic salts precursors, carbonaceous materials with properties that surpass those reported here can be prepared and more application fields are waited to be extended by these carbons.

    DOI: 10.1016/j.mtener.2020.100446

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  • Significant effect of base assisted intercalates in synthesis of 2D semiconductor Ti<inf>3</inf>C<inf>2</inf>O<inf>2</inf> 査読有り

    Gao L., Wang N., Cao J., Li Y., Ma T.

    Surfaces and Interfaces   20   2020年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Elsevier B.V. Theoretical chemists have predicted that Ti2CO2 and Ti3C2O2 possess an indirect bandgap that causes them to transform into semiconductors. However, few experiments have reported the appropriate bandgap for Ti3C2O2 and Ti2CO2. In this study, we first proved that Ti3C2O2 is a semiconductor by using a base-assisted intercalation method. A comprehensive study, including spectroscopy measurements, a computational approach, and mechanism analysis, established the efficacy of using a base. Results showed that Ti3C2O2 with a bandgap of 0.66 eV can be easily obtained after low-temperature annealing by using a novel base-assisted intercalation method. By contrast, such compound was hardly obtained when a solution intercalation procedure was used. The significant effect of the base was demonstrated in the synthesis procedure and the mechanism. The theoretical calculation predicted that Ti3C2O2 is a semiconductor with an indirect bandgap of 0.63 eV from the generalized gradient approximation. This prediction is consistent with the experimentally determined value.

    DOI: 10.1016/j.surfin.2020.100604

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  • Morphology engineering of cobalt embedded in nitrogen doped porous carbon as bifunctional oxygen electrocatalyst for Zn-air battery 査読有り

    Li Y., Cui M., Wang C., Chen Y., Chen S., Gao L., Liu A., Su W.N., Ma T.

    Materials Today Energy   17   2020年09月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The structure and morphology of catalysts can affect their catalytic performance due to the various exposed active sites and mass transport pathway. Herein, we synthesis a serious of Co-based complex with spindle-like, branched spindle, disk-like and quasi-sphere morphologies and found that the crystal growth is controlled by multistep crystal splitting mechanism. We further transferred the Co-based complex into Co embedded in nitrogen doped porous carbon (Co@NC) by thermal annealing to investigate the morphology effect of electrocatalysts. It was found the catalytic performance of the catalysts exhibits a trend of quasi-sphere (Co@NC-80) > spindle-like (Co@NC-300) > branched spindle (Co@NC-200) > disk-like (Co@NC-130), probably due to the various exposed efficient active sites of the catalyst induced by their morphology, and various mass transport resistance in the catalysts. Impressively, the Co@NC-80 exhibits comparable ORR (oxygen reduction reaction) activity with Pt/C and better OER (oxygen evolution reaction) activity than RuO2, highlighting its bifunctional catalytic performance for metal-air batteries. The Zn-air catalyzed by Co@NC-80 exhibits an open circuit voltage of 1.35 V, a high specific capacity of 887.5 mA h/g and a max power density of 168.7 mW cm−2, as well as excellent long-time stability with no obvious performance decay after charge-discharge cycling of 140 h.

    DOI: 10.1016/j.mtener.2020.100455

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  • Synthesis of 2D layered Nb<inf>2</inf>SnC at low sintering temperature and its application for high-performance supercapacitors 査読有り

    Zhang Z., Huang X., Lu W., Qiu X., Ma T., Xia W.

    Journal of Solid State Chemistry   288   2020年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Elsevier Inc. Two-dimensional (2D) material of Nb2SnC was prepared by a mild and simple solid-state reaction for high performance supercapacitors. The prepared Nb2SnC were etched and further exfoliated in diverse solvents. The morphology development was observed by SEM and the results suggest Nb2SnC treated by hydrofluoric solution (HF) and dimethyl sulfoxide (DMSO) in sequence has a large surface area. Moreover, the phase and chemical properties of treated Nb2SnC were characterized by XRD, EDS and XPS. In this work, the electrochemical performances were recorded by Solartron 1287 Potentiostat Galvanostat workstation. It is revealed that the specific capacitance (Cs) of pristine Nb2SnC is only 25 ​F ​g−1 at a scanning rate of 2 ​mV ​s−1. Remarkably, the Cs was increased to 128 ​F ​g−1 at the same scanning rate after etched by HF for 48 ​h. Upon optimization, Nb2SnC–HF exfoliated by DMSO exhibits a capacitance of 140 ​F ​g−1 owing to the large electrochemical active surface. Promoting for practical applications, Nb2SnC based devices were assemble. The fabricated devices contributed to an energy density of 14.4 ​Wh kg−1 at the power density of 36 ​W ​kg−1 with a good stability within 0 V–0.8 ​V. Therefore, Nb2SnC is a highly promising candidate for energy storage systems with excellent electrochemical performances.

    DOI: 10.1016/j.jssc.2020.121425

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  • Intermediate-Controlled Interfacial Engineering for Stable and Highly Efficient Carbon-Based PSCs 査読有り

    Meng F., Li Y., Gao L., Liu A., Li Y., Wang T., Zhang C., Fan M., Wei G., Ma T.

    ACS applied materials &amp; interfaces   12 ( 30 )   34479 - 34486   2020年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A major bottleneck hindering the performance and commercial application of cost-effective carbon-based perovskite solar cells (C-PSCs) is the contact issue at the interface of the perovskite layer and the carbon counter electrode. Herein, a new approach of intermediate-controlled interfacial engineering (IIE) utilizing an ultra-low-cost acetylene black material is developed for the first time that can improve the interfacial contact of C-PSCs. We achieved both high efficiency (16.41%) without hole-transport materials and good stability as a result of the optimal heterogeneous interfacial contact. Devices without any encapsulation consistently exhibit excellent environmental stability, retaining 93% of their original efficiency by storing in an ambient atmosphere (30 °C, 30% RH) for 2000 h and achieving 81% of their original efficiency by storing in a terrible air environment (85 °C, 65% RH) for 312 h. In addition, to acquire a deep understanding of carrier transport, a comparison of heterogeneous interfaces fabricated using different methods has been undertaken. In C-PSCs fabricated by the IIE method, the lower radioactive recombination and faster carrier transfer result in a shorter carrier lifetime. We present a promising future for the industrialization of C-PSCs by reducing the costs and improving the performance.

    DOI: 10.1021/acsami.0c11419

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  • Energy Band Regulation in 2D Perovskite Solar Cells 査読有り

    Zhou Y., Hu J., Meng F., Liu C., Gao L., Ma T.

    Progress in Chemistry   32 ( 7 )   966 - 977   2020年07月

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    記述言語:中国語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2020, Editorial Office of Progress in Chemistry. All right reserved. Perovskite solar cells(PSCs) have achieved more than 25% efficiency in just a decade, which are of great commercial value. This is because the three-dimensional ( 3D ) perovskite ( PVK ) layer has many advantages, such as suitable bandgap, high absorption coefficient and long electron diffusion length. However, unstability is still an urgent problem to be solved in 3D PSCs. Comparing with 3D perovskite materials, 2D perovskite crystals have recently attracted increasing attention due to some unique properties for improving stability. The hydrophobic bulky alkylammonium cations in 2D perovskite lattices can block the accessible pathways of moisture invasion, making them promising candidates for optoelectronic devices. Meanwhile, due to the tolerance of 2D perovskite to organic and inorganic elements, its chemical composition and energy band also change. This review highlights the importance of energy bands in 2D PSCs and summarizes bandgap regulation and energy level alignment(ELA) of 2D perovskite, which plays an important role in guiding the preparation of high-efficiency and stable low-dimensional perovskite solar cells.

    DOI: 10.7536/PC191102

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  • Investigation of the re-dispersion of matrix Cu species in Cu<inf>: x </inf>Ce<inf>1- x </inf>O<inf>2</inf>nanorod catalysts and its effect on the catalytic performance in CO-PROX 査読有り

    Guo X., Ye W., Ma T.

    Catalysis Science and Technology   10 ( 14 )   4766 - 4775   2020年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 The Royal Society of Chemistry. In the present work, CuxCe1-xO2 nanorod catalysts synthesized by a co-precipitation method were treated with nitric acid to remove all the surface copper species and merely preserve the matrix copper species in the framework of ceria. With the subsequent thermal treatment at various temperature, the re-dispersion phenomenon of the matrix copper was investigated to different degrees and showed a profound influence on the catalytic performance in CO-PROX. Various analysis methods (XRD Rietveld refinement, HRTEM, XPS, H2-TPR and in situ DRIFTs) were used to characterize the texture/structure property, redox property and surface element distribution of the catalyst along with the re-dispersion process. The acid-treated process not only diminished the active copper species for CO adsorption but also destroyed the surface oxygen vacancy, which severely damaged the low-temperature CO oxidation activity of H-CuCe(rod). Motivated by the thermal treatment, the matrix copper species shifts from the framework to the surface region, and is dispersed as surface CuOx species. In cooperation with the recovered oxygen vacancy, the interfacial interaction between copper and ceria was rebuilt and the catalytic performance of H-CuCe(rod) was remarkably enhanced with higher CO conversion (T50%: 137 °C to 80 °C) and a broader temperature window (width: zero to 50 °C). With further elevating the calcination temperature, much more matrix copper species was re-dispersed as surface CuOx species and further stimulated the low-temperature CO oxidation activity of H-CuCe(rod)-600. However, the deficiency of the matrix copper interacting with the ceria lattice and the reduced oxygen vacancy concentration led to a rapid decrease in CO conversion at high temperature and narrowed the temperature window for H-CuCe(rod)-600 in the preferential oxidation of CO (CO-PROX). Our findings reveal that the CO-PROX performance of a shape-controlled copper-ceria catalyst is highly sensitive to the distribution of copper species and could be regulated by the acid and subsequent thermal treatment process, providing a new insight into the development of highly efficient copper-ceria catalysts for CO-PROX.

    DOI: 10.1039/d0cy00519c

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  • Cs-Incorporated AgBiI<inf>4</inf>Rudorffite for Efficient and Stable Solar Cells 査読有り

    Yu F., Wang L., Ren K., Yang S., Xu Z., Han Q., Ma T.

    ACS Sustainable Chemistry and Engineering   8 ( 27 )   9980 - 9987   2020年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2020 American Chemical Society. The Ag-Bi-I system has recently attracted much attention as a potential material for use in Pb-free solar cells due to its low toxicity and good stability. However, the main issue of the Ag-Bi-I rudorffite solar cells is that the power conversion efficiency (PCE) is still quite low. In this study, a series of CsxAg1-xBiI4 absorbers were synthesized by introducing different amounts of Cs via a simple method. It was found that Cs incorporation is promising for achieving dense and pinhole-free CsxAg1-xBiI4 films. In addition, the valence band edge of the 5% Cs-cooperated film is slightly upshifted. The corresponding CsxAg1-xBiI4 rudorffite solar cells achieved an enhancement of 40% in PCE for both the mesoporous structure and planar structure solar cells. After the Cs cooperation, the devices also show better long-term air stability than that of pure AgBiI4.

    DOI: 10.1021/acssuschemeng.0c00496

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  • Co loaded on graphene with interfacial structure as high performance catalyst for 4e<sup>−</sup> ORR: a DFT study 査読有り

    Liu A., Li C., Ren X., Gao L., Ma T.

    Ionics   26 ( 7 )   3483 - 3490   2020年07月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    On the basis of density functional theory (DFT), Co/C (carbon) catalyst was designed theoretically to improve the catalytic activity of the carbon-supported cobalt composite catalyst. The quantum chemical information was analyzed to explore the rules between structures, and then high-activity catalysts were selected according to molecular orbital energy. Theoretical calculation showed that the quaternary Co catalyst structure is the most stable structure with high catalyst activity. Then, the nitrogen (N) atoms were introduced to further improve the catalyst activity, and finally the best catalyst was selected as the quaternary atomically loaded N-doped Co/C catalyst. The oxygen reduction reaction (ORR) mechanism of selected Co/C catalyst was studied through theoretical calculation. The results showed that the overall process stability of the 4e− ORR pathway on C and N atoms is high, and the activation effect of the reactant O2 is optimal; the overall energy barrier span is significantly lower than that without the catalyst.

    DOI: 10.1007/s11581-020-03471-2

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  • Significantly Enhanced V-oc and Efficiency in Perovskite Solar Cells through Composition Adjustment of SnS<inf>2</inf>Electron Transport Layers 査読有り

    Gao L., Liu C., Meng F., Liu A., Li Y., Li Y., Zhang C., Fan M., Wei G., Ma T.

    ACS Sustainable Chemistry and Engineering   8 ( 25 )   9250 - 9256   2020年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2020 American Chemical Society. The energy level alignment (ELA) between electron transport layers (ETLs) and perovskite layers would affect the photovoltaic performance of perovskite solar cells (PSCs), especially for the open-circuit voltage (Voc). However, systematic investigations were rarely reported. In this letter, a series of SnS2/SnS composite ETLs were in situ synthesized, where the doping of SnS was used to adjust the energy level of SnS2 nanosheets. Results showed that electrons could be transferred from perovskite layers to ETLs; even the conduction band (CB) of ETLs was a little higher than that of perovskite layers. In comparison with PSCs based on SnS2 ETLs, the power conversion efficiency (PCE) of PSCs based on SnS2/SnS was enhanced by 27.95% (from 14.13% to 18.08%) with a higher Voc promotion (from 0.94 to 1.08 V). A corresponding explanation and working principle have been proposed. In addition, a stability test demonstrated that PSCs based on SnS2/SnS ETLs possessed much better stability than that of traditional PSCs based on TiO2 ETLs because of the strong interaction of Pb and S. This work proposes a promising future for reducing the Voc loss and improving the stability of perovskites.

    DOI: 10.1021/acssuschemeng.0c02565

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  • The reaction pathway of the CO<inf>2</inf>RR to low-carbon alcohols: a theoretical study 査読有り

    Liu A., Guan W., Cao Q., Ren X., Gao L., Zhao Q., Ma T.

    New Journal of Chemistry   44 ( 21 )   8971 - 8976   2020年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2020. Catalytic hydrogenation of CO2to chemicals is an important approach for reducing the concentration of CO2in the atmosphere. Among all value-added chemicals, alcohol can be considered one of the most economical products owing to its high calorific value and vast applications. There is no unanimous pathway of CO2reduction to methanol and ethanol owing to its complex mechanism. In this work, we theoretically investigated the intermediates and pathway of the CO2RR to low-carbon alcohols using the density functional theory analysis and selected optimal reaction pathways by comprehensive evaluations. Additionally, the effects of environmental temperature and reaction phases were studied. This work can be regarded as a theoretical and introductory foundation for the further design of catalysts.

    DOI: 10.1039/d0nj01265c

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  • Strategies for Interfacial Modification in Perovskite Solar Cells 査読有り

    Meng F., Liu C., Gao L., Ma T.

    Progress in Chemistry   32 ( 6 )   817 - 835   2020年06月

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    記述言語:中国語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2020, Editorial Office of Progress in Chemistry. All right reserved. Recently, the certified efficiency of perovskite solar cells(PSCs) has reached 25.2%, which are considered to be the most promising candidate for next-generation thin-film solar cells. However, uncontrollable film morphology and poor crystallinity of perovskite prepared by the solution process restrict the improvement of stability and large-area production of PSCs. To solve this problem, researchers have carried out the interfacial modification between perovskite layer and charge transport layer. Herein, we summarize applications of strategies for interfacial modification in perovskite solar cells from the perspective of methods, materials, and characterization. Meanwhile, the promising prospects of interfacial modification in low-cost and large-area PSCs are provided.

    DOI: 10.7536/PC190931

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  • Several economical and eco-friendly bio-carbon electrodes for highly efficient perovskite solar cells 査読有り

    Gao L., Zhou Y., Meng F., Li Y., Liu A., Li Y., Zhang C., Fan M., Wei G., Ma T.

    Carbon   162   267 - 272   2020年06月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    One of the major problems limits the applications of perovskite solar cells (PSCs) is the high cost of hole transporting materials (HTMs) and noble metallic electrodes. For HTMs and noble-metal-free PSCs, carbon materials have been utilized as counter electrodes (CEs). In this paper, four kinds of ultra-low-cost bio-carbon materials have been applied and compared in PSCs. Results showed that the photovoltaic performance of PSCs based on different bio-carbon CEs was determined by the interfacial connection, work function (WF), sheet resistance, crystallinity, and morphology of these bio-carbons. The high PCE (12.82%) of PSCs based on bio-carbon CEs has been achieved in current state-of-the-art. PSCs based on bio-carbon CEs was more stable than that of conventional devices, which could retain 87% of their initial PCE after storing for 2000 h in room temperature. Our work proposes a new pathway for the exploration of low-cost bio-carbon materials and could accelerate the applications of PSCs based on carbon electrode.

    DOI: 10.1016/j.carbon.2020.02.049

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  • A two-dimensional Ru@MXene catalyst for highly selective ambient electrocatalytic nitrogen reduction 査読有り

    Liu A., Gao M., Ren X., Meng F., Yang Y., Yang Q., Guan W., Gao L., Liang X., Ma T.

    Nanoscale   12 ( 20 )   10933 - 10938   2020年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Compared with the traditional Haber-Bosch process, electrochemical ammonia synthesis has attracted much attention owing to its low energy consumption, low pollution potential, and sustainability. However, owing to the influence of high overpotential and low selectivity, the nitrogen reduction reaction (NRR) process was of limited applicability in industry. Here, we report a high-performance Ru@Ti3C2 MXene catalyst for an ambient electrocatalytic NRR. In a 0.1 M KOH electrolyte, the NH3 yield of the Ru@MXene catalyst reached 2.3 μmol h-1 cm-2, furthermore, at -0.4 V (vs. RHE) the Faraday efficiency was 13.13%.

    DOI: 10.1039/d0nr00788a

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  • Hollow-structure engineering of a silicon-carbon anode for ultra-stable lithium-ion batteries 査読有り

    Liu H., Chen Y., Jiang B., Zhao Y., Guo X., Ma T.

    Dalton Transactions   49 ( 17 )   5669 - 5676   2020年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry 2020. Silicon has received much attention due to its high theoretical capacity as the electrode of lithium-ion batteries (LIBs). However, the poor stability caused by the volume expansion problem affects the cycle life of batteries, thus severely limiting the application of the silicon anode. In the present work, we engineered silicon nanotubes with hollow-structure to accommodate the volume expansion of silicon and improve the electrochemical stability of lithium ion batteries. Hollow silicon nanotubes werein situsynthesized on carbon cloth (HSiNTs/CC) by reducing silicon oxide and corroding zinc oxide nanorod templates and directly used as the anode of lithium-ion batteries without any binders or conductive additives. The results of electrochemical measurements indicated that HSiNTs/CC exhibits superior LIB performance with excellent cycling stability and good rate capability. At a current density of 100 mA g−1, a reversible capacity of 1420 mA h g−1was achieved and the fabricated LIB could retain 93.7% of the initial capacity after 100 cycles. Even at a decoupled current density of 1000 mA g−1, the LIB still possesses a capacity of 1026 mA h g−1and 98.3% capacity retention after 100 cycles. The results demonstrated that the thin hollow structures were well suited to accommodate the volume expansion of silicon and improve the stability of the HSiNTs/CC anode during the lithiation-delithiation cycles, which shines some light on the reasonable design and preparation of silicon anodes for ultra-stable lithium-ion batteries.

    DOI: 10.1039/d0dt00566e

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  • Enhanced Device Performance with Passivation of the TiO<inf>2</inf> Surface Using a Carboxylic Acid Fullerene Monolayer for a SnPb Perovskite Solar Cell with a Normal Planar Structure 査読有り

    Hamada K., Tanaka R., Kamarudin M.A., Shen Q., Iikubo S., Minemoto T., Yoshino K., Toyoda T., Ma T., Kang D.W., Hayase S.

    ACS Applied Materials and Interfaces   12 ( 15 )   17776 - 17782   2020年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2020 American Chemical Society. Research on tin-lead (SnPb) perovskite solar cells (PSCs) has gained popularity in recent years because of their low band gap, which could be applied to tandem solar cells. However, most of the work is based on inverted PSCs using PEDOT:PSS as the hole-transport layer as normal-structure PSCs show lower efficiency. In this work, the reason behind the low efficiency of normal-structure SnPb PSCs is elucidated and surface passivation has been tested as a method to overcome the problem. In the case of normal PSCs, at the interface between the titania layer and SnPb perovskite, there are many carrier traps observed originating from Ti-O-Sn bonds. In order to avoid the direct contact between titania and the SnPb perovskite layer, the titania surface is passivated with carboxylic acid C60 resulting in an efficiency increase from 5.14 to 7.91%. This will provide a direction of enhancing the efficiency of the normal-structure SnPb PSCs through heterojunction engineering.

    DOI: 10.1021/acsami.0c01411

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  • Facile synthesis of ZnS decorated N, S co-doped carbon polyhedron as high efficiency oxygen reduction reaction catalyst for Zn-air battery 査読有り

    Li Y., Wang C., Cui M., Chen S., Gao L., Liu A., Ma T.

    Applied Surface Science   509   2020年04月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Developing low cost, environmentally friendly and high efficiency oxygen reduction reaction (ORR) electrocatalysts is critical for clean energy conversion and storage devices including fuel cells and metal-air batteries. Herein, we developed a facile method to doping N, S and ZnS into carbon framework simultaneously. The N, S co-doping and extra ZnS active sites could prominently enhance the ORR performance of the carbon. The optimized sample ZnS@NC-3 exhibit an onset potential of 0.94 V and a half-wave potential of 0.84 V, which is comparable to 20 wt% Pt/C. In addition, the methanol tolerance and cycle ability are obvious superior than that of Pt/C. Moreover, when used as electrocatalysts for Zn-air battery, the battery exhibits an open circuit voltage of 1.524 V, a high specific capacity of 736 mA h g−1 and a max power density of 176 mW cm−2, demonstrating its great potential for clean energy conversion.

    DOI: 10.1016/j.apsusc.2020.145367

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  • Excellent Moisture Stability and Efficiency of Inverted All-Inorganic CsPbIBr<inf>2</inf> Perovskite Solar Cells through Molecule Interface Engineering 査読有り

    Yang S., Wang L., Gao L., Cao J., Han Q., Yu F., Kamata Y., Zhang C., Fan M., Wei G., Ma T.

    ACS Applied Materials and Interfaces   12 ( 12 )   13931 - 13940   2020年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 American Chemical Society. All-inorganic lead halide perovskite solar cells (PSCs) have drawn widespread interest because of its excellent thermal stability compared to its organic-inorganic hybrid counterpart. Poor phase stability caused by moisture, however, has thus far limited their commercial application. Herein, by modifying the interface between the hole-transport layer (HTL) and the perovskite light absorption layer, and by optimizing the HTL for better energy alignment, we controlled the growth of perovskite, reduced carrier recombination, facilitated carrier injection and transport, and improved the PSC's power conversion efficiency (PCE) and moisture stability. When testing using a positive bias scan, we obtained a significant improvement in PCE, 9.49%, which is the champion efficiency of CsPbIBr2-based inverted PSC at present. The stability measurement shows that the passivated CsPbIBr2-based inverted PSCs can retain 86% of its initial efficiency after 1000 h preserved in ambient air with 65% relative humidity. This study paves a new way for enhancing the moisture stability and power conversion efficiency of CsPbIBr2-based PSCs.

    DOI: 10.1021/acsami.9b23532

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  • Suppression of Iodide Ion Migration via Sb<inf>2</inf>S<inf>3</inf> Interfacial Modification for Stable Inorganic Perovskite Solar Cells 査読有り

    Xu Z., Wang L., Han Q., Kamata Y., Ma T.

    ACS Applied Materials and Interfaces   12 ( 11 )   12867 - 12873   2020年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2020 American Chemical Society. In mixed halide perovskite, the halide phase segregation is commonly observed due to halide ion migration, which causes severe stability issues in perovskite devices. Here, we directly revealed the iodide-migration process via potentiostatic treatment in CsPbIBr2 perovskite. The absence of iodide ions was reduced significantly via a Sb2S3 interfacial modification. We further employed the density functional theory (DFT) calculation to optimize the geometry positions at the perovskite interface and radial distribution functions (RDF) to analyze the atom perturbation. The simulation yielded a slight distortion of the perovskite lattice at the Sb2S3-CsPbIBr2 interface and iodide ion fluctuation was reduced due to the decrease of halide vacancies. In addition, the thermally stimulated current was calculated to evaluate the defect density in the modified perovskite device. Due to the Sb2S3 interaction with perovskite, the device became stable against humidity and maintained its photoactivity over 400 h. The champion efficiency of 9.31% with 26.31% improvement was obtained in modified CsPbIBr2 perovskite solar cells.

    DOI: 10.1021/acsami.9b23630

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  • Current progress in electrocatalytic carbon dioxide reduction to fuels on heterogeneous catalysts 査読有り

    Liu A., Gao M., Ren X., Meng F., Yang Y., Gao L., Yang Q., Ma T.

    Journal of Materials Chemistry A   8 ( 7 )   3541 - 3562   2020年02月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    As a promising and important carbon source, utilization of carbon dioxide (CO2) can effectively solve the energy crisis caused by fossil resource consumption and the environmental problems arising from the emission of CO2. The electrocatalytic method is currently a promising research method for CO2 reduction; however, it faces the problems of low product selectivity and poor faradaic efficiency (FE). Therefore, the design of effective catalysts with lower overpotential, high FE, and product selectivity is key consideration for the development of electrochemical CO2 reduction (CO2RR). Herein, we summarize the current research progress in the electrocatalytic reduction of CO2 to fuels on heterogeneous catalysts. Progress in the electrocatalytic reduction of two types of products, C1 products (CO, HCOOH, CH3OH, CH4) and C2 products (CH3CH2OH and C2H4), are discussed. The catalytic activity, FE, product selectivity, electrocatalytic mechanisms, and challenges faced in terms of product selectivity and catalytic activity stability in electrochemical CO2 reduction are discussed. This review can provide effective guidance for the design of effective catalysts with high activity, product selectivity, FE, and stability.

    DOI: 10.1039/c9ta11966c

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  • 2D heterostructure comprised of Ni<inf>3</inf>S<inf>2</inf>/d-Ti<inf>3</inf>C<inf>2</inf> supported on Ni foam as binder-free electrode for hybrid supercapacitor 査読有り

    Zhao Y., Guo J., Liu A., Ma T.

    Journal of Alloys and Compounds   814   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier B.V. 2D materials and their composites are promising energy storage candidates. In this work, 2D horizontal heterostructure comprised of Ni3S2/delaminated-Ti3C2, denoted as Ni3S2/d-Ti3C2, supported on Ni foam is prepared by a two-step method and used as binder free electrode for hybrid supercapacitor. The as-obtained composites are characterized by X-ray diffraction analysis, scanning electron microscope, transmission electron microscope and X-ray photoelectron spectroscopy. The electrochemical properties of Ni3S2/d-Ti3C2 on Ni foam (denoted as Ni3S2/d-Ti3C2/NF) are studied using cyclic voltammetry, galvanostatic charge-discharge analysis and electrochemical impedance spectroscopy. It is found that the Ni3S2/d-Ti3C2/NF electrode exhibits superior capacitive performance with specific capacity of 2204 F g−1 at a constant current density of 1 A g−1. A hybrid supercapacitor is fabricated by using Ni3S2/d-Ti3C2/NF electrode as positive electrode, active carbon (AC) coated on Ni foam as negative electrode and KOH aqueous solution as electrolyte. The Ni3S2/d-Ti3C2/NF//AC hybrid supercapacitor exhibits a maximum energy density of 23.6 W h kg−1 and a maximum power density of 4004.4 W kg−1. The results supply new strategy for constructing MXene-based 2D horizontal heterostructure, and suggest that Ni3S2/d-Ti3C2/NF composite as a binder free electrode is an ideal candidate for supercapacitor applications.

    DOI: 10.1016/j.jallcom.2019.152271

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  • Aurivillius Halide Perovskite: A New Family of Two-Dimensional Materials for Optoelectronic Applications 査読有り

    Zhao S., Lan C., Li H., Zhang C., Ma T.

    Journal of Physical Chemistry C   124 ( 3 )   1788 - 1793   2020年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Layered perovskites have attracted considerable attention in optoelectronic applications because of their excellent electronic properties and stability. In this work, the quasi-2D Aurivillius halide perovskites are investigated using density functional theory. The single-layer Aurivillius perovskite Ba2PbI6 is predicted to have a direct band gap of 1.89 eV, which is close to that of the Ruddlesden-Popper perovskite Cs2PbI4. The electronic structures near the Fermi level are mainly governed by the [PbX6] octahedra, which leads to electronic properties similar to that of Cs2PbI4. Decomposition energies reveal that these Aurivillius perovskites exhibit thermal instability. However, increasing the number of the [PbX6] octahedra layer can enhance the stability and reduce the band gap. Our results indicated that for n 5, it is possible to synthesize the thermally stable Cl-based Aurivillius perovskite Ba2Csn-1PbnCl3n+3. Bi- A nd In-based Aurivillius perovskites are also calculated to evaluate the Pb-free alternatives. These calculations can serve as a theoretical support in exploring novel layered perovskites for optoelectronic applications.

    DOI: 10.1021/acs.jpcc.9b08450

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  • Stability Improvement of Perovskite Solar Cells by Adding Sb-Xanthate to Precursor Solution 査読有り

    Nam K.S., Krishnamurthy S., Qing S., Toyoda T., Yoshino K., Minemoto T., Ma T., Pandey S., Hayase S.

    Physica Status Solidi (A) Applications and Materials Science   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Wiley-VCH GmbH Herein, it is reported that the stability of a halogenated perovskite (PVK) solar cell consisting of an fluorine-doped tin oxide (FTO) substrate/TiO2/CH3NH3PbI3/N2,N2,N2′,N2′,N7,N7,N7′,N7′-octakis(4-methoxyphenyl)-9,9′-spirobi[9H-fluorene]-2,2′,7,7′-tetramine/Ag/Au structure is improved by adding Sb-xanthate to the PVK layer without large loss of efficiency. The Sb-element-rich layer is observed on top of the PVK layer. From the X-ray photoelectron spectroscopy (XPS) study, it is concluded that an inorganic SbxOy passivation layer on the PVK layer is prepared by baking the solution of the Sb-xanthate and the PVK precursor. The inorganic layer prevents moisture and oxygen from penetrating into the PVK layer. This article provides a new method to obtain a passivation layer on a PVK layer by baking a mixture solution in one step for improving solar cell stability.

    DOI: 10.1002/pssa.202000144

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  • Comparison of Physical Isolation on Large Active Area Perovskite Solar Cells 査読有り

    Gao L., Yan Y., Li Y., Ma T.

    Chemical Research in Chinese Universities   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH. To reduce the quadratic scaling of the series resistance(Rs) and sheet resistance(Rst) of the devices, physical isolation of the large area devices into small pieces has been proven to be a reliable and cost-efficient patterning technique. In this paper, we got an interesting result that the physical isolation did not show obvious effect on the photovoltaic performance of perovskite solar cells(PSCs) when fixing the active area. Three different isolation types, unetched ITO, etched ITO, and laser etching whole devices, have been induced to investigate the physical isolation roles. The results show that the electrons and holes could be collected efficiently in active area for all the isolation types. The proposed mechanism illustrates that the nonradiative recombination and recombination of electrons and hole in inactive area do not influence the performance of devices. This work may open a new way for the commercialization of PSCs by reducing the complex process and the etching costs.

    DOI: 10.1007/s40242-020-0060-z

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  • Synthesis of Sb(V) Complexes with Pyridyl Cations and Application for Lead-free Perovskite Solar Cells 査読有り

    Xu Zhenhua, Zhang Chu, Yu Fengyang, Kamata Yusuke, Hayase Shuzi, Ma Tingli

    Chemistry Letters ( 公益社団法人 日本化学会 )   49 ( 8 )   944 - 946   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    <p>Lead halide perovskite has emerged as a promising photovoltaic material due to its excellent power conversion efficiency (PCE). However, the toxicity problem of lead-based perovskite hampers the commercialization of perovskite solar cells. Here, we develop several Sb(V) complexes with pyridyl cations and serve as absorber layer for lead-free perovskite solar cells. The designed complexes were based on 4-<i>tert</i>-butylpyridine (<i>t</i>BP) and <i>N</i>-ethylpyridinium (<i>N</i>-EtPy) cations with bandgaps of 2.01 eV and 1.95 eV, which showed their potential for solar cells and optoelectronic applications. We also found a chemical rule for stable Sb complexes in terms of the bond connectivity of pnictogen-antimony. Initial studies produce a solar cell with a PCE of 0.9% and offer inspiration for further exploration of environment-friendly perovskite families.</p>

    DOI: 10.1246/cl.200208

    CiNii Article

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  • Recent Progress in MXene-Based Materials: Potential High-Performance Electrocatalysts 査読有り

    Liu A., Liang X., Ren X., Guan W., Gao M., Yang Y., Yang Q., Gao L., Li Y., Ma T.

    Advanced Functional Materials   2020年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The family of transition metal carbides, nitrides, and carbonitrides (collectively called MXenes) has been a thriving field since the first invention of Ti3C2Tx (MXene) in 2011. MXene is a new type of nanometer 2D sheet material, which exhibits great application potentials in various fields due to its multiple advantages such as high specific surface area, good electrical conductivity, and high mechanical strength. Electrocatalysis is regarded as the core of future clean energy conversion technologies, and MXene-based materials provide inspiration for the design and preparation of electrocatalysts with high activity, high selectivity, and long loading life time. The applications of MXene-based materials in electrocatalysis, including hydrogen evolution reaction, nitrogen reduction reaction, oxygen evolution reaction, oxygen reduction reaction, carbon dioxide reduction reaction, and methanol oxidation reaction are summarized in this review. As a crucial session regarding experiments, the current safer and more environmentally friendly preparation methods of MXene are also discussed. Focusing on the materials design and enhancement methods, the key challenges and opportunities for MXene-based materials as a next-generation platform in both fundamental research and practical electrocatalysis applications are presented. This account serves to promote future efforts toward the development of MXenes and related materials in the electrocatalysis applications.

    DOI: 10.1002/adfm.202003437

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  • Current Progress of Electrocatalysts for Ammonia Synthesis Through Electrochemical Nitrogen Reduction Under Ambient Conditions 査読有り

    Liu A., Yang Y., Ren X., Zhao Q., Gao M., Guan W., Meng F., Gao L., Yang Q., Liang X., Ma T.

    ChemSusChem   2020年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Ammonia, one of the most important chemicals and carbon-free energy carriers, is mainly produced by the traditional Haber–Bosch process operated at high pressure and temperature, which results in massive energy consumption and CO2 emissions. Alternatively, the electrocatalytic nitrogen reduction reaction to synthesize NH3 under ambient conditions using renewable energy has recently attracted significant attention. However, the competing hydrogen evolution reaction (HER) significantly reduces the faradaic efficiency and NH3 production rate. The design of high-performance electrocatalysts with the suppression of the HER for N2 reduction to NH3 under ambient conditions is a crucial consideration for the development of electrocatalytic NH3 synthesis with high FE and NH3 production rate. Five kinds of recently developed electrocatalysts classified by their chemical compositions are summarized, with particular emphasis on the relationship between their optimal electrocatalytic conditions and NH3 production performance. Conclusions and perspectives are provided for the future design of high-performance electrocatalysts for electrocatalytic NH3 production. The Review can give practical guidance for the design of effective electrocatalysts with high FE and NH3 production rates.

    DOI: 10.1002/cssc.202000487

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  • Current Progress in Solid-State Electrolytes for Dye-Sensitized Solar Cells: A Mini-Review 査読有り

    Wang N., Hu J., Gao L., Ma T.

    Journal of Electronic Materials   2020年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2020, The Minerals, Metals & Materials Society. Low-cost and high-performance dye-sensitized solar cells (DSSCs) are considered promising candidates for commercial application. As one of the crucial components, electrolytes are considered the limiting factor for long-term DSSC stability. As alternative materials, solid-state electrolytes have been used in DSSCs, which may solve the problem of liquid electrolytes, such as leakage and volatilization. In this review, we define solid-state electrolytes as inorganic hole transport materials (HTMs), organic HTMs, ionic conductive polymer electrolytes, and ionic liquid polymer electrolytes according to the different types of carriers and summarize the latest development trends of these electrolytes. We discuss in detail the mechanism of solid-state dye-sensitized solar cells (ssDSSCs), including the hole transfer process at the dye/hole-conductor interface and factors that reduce the efficiency of ssDSSCs, and summarize several methods to improve the efficiency and long-term stability of ssDSSCs. These may facilitate the research and development of electrolytes for ssDSSCs.

    DOI: 10.1007/s11664-020-08483-2

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  • Delocalized molecule surface electronic modification for enhanced performance and high environmental stability of CsPbI<inf>2</inf>Br perovskite solar cells 査読有り

    Wang Z., Baranwal A., Akmal kamarudin M., Zhang P., Kapil G., Ma T., Hayase S.

    Nano Energy   66   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier Ltd All-inorganic perovskites have drawn tremendous attentions in view of their superb thermal stability. However, unavoidable defects near the perovskite surface seriously hampers carrier transport and easily results in ion accumulation at the interface of perovskite layer and charge transport layer. Herein, delocalized thiazole and imidazole derivatives iodide salts functionalized on perovskite surface have been investigated comprehensively. These two salts post-treatment on perovskite could efficiently passivate traps arising from Cs+ or I− vacancies. Additionally, these highly п-conjugated delocalized molecules can contribute to the efficient charge transport and prevent ions accumulation at the interface. As a result, sulfur-contained aminothiazolium iodide (ATI) post-treated CsPbI2Br devices showed simultaneous enhanced current density and voltage due to its higher interaction with perovskite lattice, this led to a champion efficiency of 13.91% with superb fill factor of more than 80%, which exhibited dramatic enhancement compared with the control samples (10.12%). Furthermore, surface passivation with delocalized molecules could effectively stabilize CsPbI2Br phase at room temperature or 80 °C annealing in ambient condition (65% RH). Equally important, this surface passivation allowed competitive efficiency of 11.26% with a large-area device (1.00 cm2). This high kill tolerant approach provide a new route to fabricate inorganic perovskite devices with higher efficiency and stability.

    DOI: 10.1016/j.nanoen.2019.104180

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  • Synthesis of monodispersed silver particles: Synthetic techniques to control shapes, particle size distribution and lightness of silver particles 査読有り

    Sannohe K., Ma T., Hayase S.

    Advanced Powder Technology   30 ( 12 )   3088 - 3098   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Society of Powder Technology Japan The purpose of this paper is to give process for preparing monodispersed silver particles with round shape having aspect ratio of 1, because the shape is suitable for preparing silver grids with fine pattern size. We found that the combination of gelatin and hydrazine gave the monodispersed silver particles with the aspect ratio of 1. Presence of the high molecular compounds is crucial probably because they are adsorbed on the surface of growing silver particles and control the uniform crystal growth. In addition, the relationship between these reaction conditions and the particle shape are discussed in detail.

    DOI: 10.1016/j.apt.2019.09.015

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  • A black phosphorus/Ti<inf>3</inf>C<inf>2</inf> MXene nanocomposite for sodium-ion batteries: A combined experimental and theoretical study 査読有り

    Li H., Liu A., Ren X., Yang Y., Gao L., Fan M., Ma T.

    Nanoscale   11 ( 42 )   19862 - 19869   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry 2019. A black phosphorus (BP)/Ti3C2 MXene composite was prepared by compositing small BP nanoparticles with exfoliated Ti3C2 layers. When used as an anode for sodium-ion batteries, the BP/Ti3C2 composite electrode exhibited higher specific capacity and better electrode stability than a BP electrode and a Ti3C2 electrode. The results of experimental and density functional theory (DFT) calculations illustrated that the synergy of BP and Ti3C2 based on a stable interfacial interaction simultaneously reduces the resistances from both electron and Na+ transport, resulting in the impressive electrochemical performance of the BP/Ti3C2 composite in sodium-ion batteries. The synthesis process and research concept could also be extended for further application of MXene materials and studies on sodium-ion batteries.

    DOI: 10.1039/c9nr04790e

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  • A novel strategy to synthesize CoMoO<inf>4</inf> nanotube as highly efficient oxygen evolution reaction electrocatalyst 査読有り

    Li Y., Wang C., Cui M., Chen S., Ma T.

    Catalysis Communications   131   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier B.V. Designing efficient oxygen evolution reaction (OER) electrocatalysts is crucial for practical applications in water splitting and metal-air battery devices. Special structures of materials often bring in unprecedented catalytic activity. Herein, we first report the synthesis of CoMoO4 nanotube by using MoO3@ZIF-67 nanorod. The CoMoO4 nanotube shows high OER activity with a low overpotential of 315 mV delivering a current density of 10 mA cm−2. The electro-catalytic activity surpasses that of many Co and Mo-based catalysts. Furthermore, the strategy presented here is facile, and can be extended to the synthesis of other Mo-based nanotube materials for energy storage and conversion.

    DOI: 10.1016/j.catcom.2019.105800

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  • La-doped SnO<inf>2</inf> as ETL for efficient planar-structure hybrid perovskite solar cells 査読有り

    Xu Z., Teo S., Gao L., Guo Z., Kamata Y., Hayase S., Ma T.

    Organic Electronics: physics, materials, applications   73   62 - 68   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier B.V. SnO2 has attracted considerable attention in perovskite solar cells (PSCs) due to its excellent optical and electrical properties. However, a poor surface morphology, specifically with the presence of pinholes after the annealing process, limits its application in PSCs. To overcome the drawback of tin oxide, lanthanum (La) is herein first to be doped into the SnO2 layer, which is able to alleviate the SnO2 crystal aggregation and produce full-coverage and a uniform film. In addition, La:SnO2 can effectively reduce the band offset of the SnO2 layer, which results in the high Voc of 1.11 V. Systematic analyses revealed that the La:SnO2 layer enhances the electron extraction and suppresses charge recombination, leading to the power conversion efficiency (PCE) enhancement from 14.24% to 17.08%.

    DOI: 10.1016/j.orgel.2019.03.053

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  • Bifunctional Dye Molecule in All-Inorganic CsPbIBr<inf>2</inf> Perovskite Solar Cells with Efficiency Exceeding 10% 査読有り

    Yang S., Guo Z., Gao L., Yu F., Zhang C., Fan M., Wei G., Ma T.

    Solar RRL   3 ( 9 )   2019年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Inorganic lead halide perovskites are attracting increasing attention due to their much better thermal stability than the organic–inorganic hybrid perovskite materials. Thus, the low power conversion efficiency (PCE) is a key issue for the inorganic lead halide perovskite solar cells (PSCs). This is mainly due to their wider bandgap and larger energy loss (Eloss) in the devices. Herein, for solving this issue, a dye molecule-assisted engineering using the dye of 5,15-bis(2,6-dioctoxyphenyl)-10-(bis(4-hexylphenyl)-amino-20-4-carboxyphenylethynyl)porphyrinato]zinc(II) (YD2-o-C8) is demonstrated. Results indicate that this molecule has a bifunctional effect, not only as a co-sensitization layer for CsPbIBr2 with broader absorption spectrum but also reduces the Eloss by interface passivation. Specifically, the light absorption range of the photoactive layer is broadened from 600 to nearly 680 nm. At the same time, the interfacial charge recombination is highly reduced. After optimizing, the champion PCE is enhanced from 7.02% to 10.13%, and record-high open-circuit voltage (VOC) of 1.37 V and short-circuit currents (JSC) of 12.05 mA cm−2 are achieved. This study opens a simple and efficient way to improve the efficiency of inorganic PSCs.

    DOI: 10.1002/solr.201900212

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  • Large-Area Perovskite Solar Cells 査読有り

    Yan Y., Cao J., Meng F., Wang N., Gao L., Ma T.

    Progress in Chemistry   31 ( 7 )   1031 - 1043   2019年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019, Editorial Office of Progress in Chemistry. All right reserved. Perovskite solar cells have been paid much attention due to their high efficiency, low cost, suitable to flexible devices. The recent research progress of large-area perovskite solar cells, including their current development, remained issues, and fabricating techniques are systematically reviewed. Furthermore, the approaches to improve power conversion efficiency and stability are summarized. Finally, the application challenges of large-area perovskite solar cells are prospected.

    DOI: 10.7536/PC181202

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  • Niobium Incorporation into CsPbI<inf>2</inf>Br for Stable and Efficient All-Inorganic Perovskite Solar Cells 査読有り

    Guo Z., Zhao S., Liu A., Kamata Y., Teo S., Yang S., Xu Z., Hayase S., Ma T.

    ACS Applied Materials and Interfaces   11 ( 22 )   19994 - 20003   2019年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 American Chemical Society. All-inorganic perovskites are attracting increasing attention due to their superior thermal stability than that of the traditional CH3NH3PbI3, while their inferior phase stability in ambient conditions is still an unsolved issue. Here, for the first time, we report the incorporation of niobium (Nb5+) ions into the CsPbI2Br perovskite. Results indicate that Nb5+ can effectively stabilize the photoactive α-CsPbI2Br phase by the possible substitution of Pb2+. With 0.5% Nb doping, the carbon electrode-based all-inorganic perovskite solar cells achieved a high photoconversion efficiency value of 10.42%, 15% higher than that of the control device. The Nb5+ incorporation reduces the charge recombination in the perovskite, leading to a champion Voc value of 1.27 V and a negligible hysteresis effect. This work explicates the high compatibility of all-inorganic perovskite materials and unlocks the opportunities for the use of high-valence ions for perovskite property modification.

    DOI: 10.1021/acsami.9b03622

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  • Favorable growth of well-crystallized layered hybrid perovskite by combination of thermal and solvent assistance 査読有り

    Xue C., Shi Y., Zhang C., Lv Y., Feng Y., Tian W., Jin S., Ma T.

    Journal of Power Sources   422   156 - 162   2019年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 In recent years, attention is increasingly paid to developing layered two-dimensional perovskites due to their superior environmental stability compare with their three-dimensional analogues. However, two-dimensional perovskite based solar cells usually give unsatisfactory photovoltaic performance due to large numbers of defects in the process of crystallinity. Many groups investigate multiple approaches to improve the crystalline quality so far. Here, we systematically investigate the influence of temperature on two-dimensional (PEA) 2 (MA) 2 Pb 3 I 10 perovskite films crystallinity based on hot-casting and post-annealing. The crystallization of (PEA) 2 (MA) 2 Pb 3 I 10 in the case of hot-casting has better crystallinity than post-annealing and discover the thermal annealing and solvent-assisted mass transfer are very important in the process of crystallization based on two-dimensional perovskite. As a result, the devices obtain a highest power conversion efficiency of 5.57% at 100 ° C (hot-casting) by optimizing heating temperature of the substrate and the hot-casting two-dimensional (PEA) 2 (MA) 2 Pb 3 I 10 films and devices display superior ambient stability. This work provides an important reference for further improve the crystallization of two-dimensional perovskite film.

    DOI: 10.1016/j.jpowsour.2019.03.037

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  • Electrostatic self-assembly of 2D delaminated MXene (Ti <inf>3</inf> C <inf>2</inf> ) onto Ni foam with superior electrochemical performance for supercapacitor 査読有り

    Guo J., Zhao Y., liu A., Ma T.

    Electrochimica Acta   305   164 - 174   2019年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier Ltd The existence of the oxygen-containing functional groups on MXene surface makes it a potential electrode material in supercapacitor based on a redox mechanism. However, the irreversible stacking of MXenes will lead to an insufficient utilization of these functional groups. To solve this problem, we fabricated a composite electrode comprised of 2D delaminated Ti 3 C 2 sheets (d-Ti 3 C 2 ) and 3D Ni foam (NF) by electrostatic self-assembly. In this electrode, d-Ti 3 C 2 nanosheets are adsorbed on the surface of 3D Ni foam skeleton structure, eliminating the need for insulative polymer binders. The self-assembly strategy endows d-Ti 3 C 2 /NF composites with unique 2D/3D structure which possesses the merits of excellent conductivity, sufficient active sites, high charge transfer efficiency and short ions diffusion path. As a result, the d-Ti 3 C 2 /NF composite electrode exhibits a high specific capacitance up to 654 F g −1 at 1 A g −1 and good cycling stability. An asymmetrical supercapacitor with d-Ti 3 C 2 /NF composite as a positive electrode, bulk Ti 3 C 2 (b-Ti 3 C 2 ) as a negative electrode and 6 M KOH as electrolyte, exhibits a maximum energy density of 18.1 Wh kg −1 (at 397.8 W kg −1 ) and excellent cycling stability (80.6% after 5000 cycles). The results indicate that d-Ti 3 C 2 /NF composite is a promising electrode material for practical energy storage devices.

    DOI: 10.1016/j.electacta.2019.03.025

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  • Enhancing oxygen evolution reaction electrocatalytic performance with vanadium-doped Co/CoO encapsulated in carbon nanorod 査読有り

    Huang H., Li Y., Li W., Chen S., Wang C., Cui M., Ma T.

    Inorganic Chemistry Communications   103   1 - 5   2019年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier B.V. Oxygen evolution reaction (OER) plays a key role in electrochemical splitting of water and it is urgent to develop high-performance and cost-effective OER catalysts. In this work, we report the synthesis of V-Co/CoO@C nanorod as highly efficient OER catalysts. The V 2 O 5 nanowire and metal organic framework composite leads to the successful preparation of the catalyst. The V 2 O 5 nanowire not only induces the formation of Co/CoO species, but also facilitates uniform V doping. When used as OER catalyst, the V-Co/CoO@C nanorod only needs a low overpotential of 320 mV to achieve a high current density of 10 mA·cm −2 .

    DOI: 10.1016/j.inoche.2019.02.041

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  • Xanthate-induced sulfur doped all-inorganic perovskite with superior phase stability and enhanced performance 査読有り

    Wang Z., Baranwal A., kamarudin M., Ng c., Pandey M., Ma T., Hayase S.

    Nano Energy   59   258 - 267   2019年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier Ltd Although the efficiency of perovskite-based solar cell has boosted up to 23%, their stability hinders the further development due to the volatile nature of organic components in conventional organic-inorganic hybrid perovskites. All-inorganic perovskites have been reported to achieve enhanced thermal stability. Herein we applied xanthate in all-inorganic perovskite to realize the sulfur-doped CsPbIBr 2 for superior phase stability. The additive cesium xanthate (CsXth) could be decomposed into cesium sulfides during annealing process. The divalent S 2- lies in the interstices of perovskite lattice and strongly coordinates with CsPbIBr 2 to stabilize the ɑ-phase, as a result, greatly enhanced stability was achieved at ambient air with 65% relative humidity (RH) compared with the reference film. Moreover, we obtained a champion efficiency of 9.78% with a high open-circuit voltage (V oc ) of 1.30 V based on 5% CsXth-CsPbIBr 2 under humid air. Performance of sulfur-doped perovskite device shows almost no decay in 10 h under humid air with 65% RH without encapsulation. These advantages provide an efficient way to prepare more efficient and superior stable perovskite device, which is beneficial toward commercialization in the future.

    DOI: 10.1016/j.nanoen.2019.02.049

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  • Ultra-low-cost coal-based carbon electrodes with seamless interfacial contact for effective sandwich-structured perovskite solar cells 査読有り

    Meng F., Gao L., Yan Y., Cao J., Wang N., Wang T., Ma T.

    Carbon   145   290 - 296   2019年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier Ltd The high cost of hole transporting materials (HTMs) and noble metallic electrodes limits the applications of perovskite solar cells (PSCs). Carbon materials, including carbon nanotube, graphene, and carbon paste, have been utilized for HTMs and noble-metal-free PSCs. Unlike other carbon materials, coal has extensive sources and lower price. A simple preparation process and an effective sandwich structure for the use of this material in PSCs were obtained by hot-pressing method. After the key parameters were adjusted, the power conversion efficiencies are 10.87% (0.3 cm2) and 8.72% (1 cm2). Therefore, devices with coal-based carbon electrodes have better stability than conventional devices. Our work proposes a promising future for the commercialization of low-cost and highly stable PSCs.

    DOI: 10.1016/j.carbon.2019.01.047

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  • Efficient oxygen reduction reaction catalyst derived from ZnO@ zeolite imidazolate framework nanowire composite 査読有り

    Huang H., Li Y., Wang N., Chen S., Wang C., Ma T.

    Inorganic Chemistry Communications   101   23 - 26   2019年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier B.V. The oxygen reduction reaction (ORR) is one of the core reactions that occur in fuel cells and metal air batteries. Metal-free catalysts such as porous carbons are promising candidates for ORR and the performance of porous carbons strongly depends on their nanostructure. Herein, we reported the synthesis of high surface area N doped carbon nanotube (CNT-900) by using ZnO@zeolite imidazolate framework (ZnO@ZIF-8) nanowire as a precursor. When used for an ORR catalyst, the CNT-900 show obvious superior performance compared with the carbon derived from ZIF-8. In addition, it exhibits comparable activity with 20 wt% Pt/C and superior stability. Combined with green and facile synthesis strategy, the method in this work can be easily extended to synthesis other nanomaterials for energy storage and conversion application.

    DOI: 10.1016/j.inoche.2019.01.008

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  • Preparation of Perovskite Films under Liquid Nitrogen Atmosphere for High Efficiency Perovskite Solar Cells 査読有り

    Zhang P., Yang F., Kapil G., Ng C., Ma T., Hayase S.

    ACS Sustainable Chemistry and Engineering   7 ( 4 )   3956 - 3961   2019年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 American Chemical Society. High-quality perovskite film with high coverage and tight grain arrangement is a key factor for obtaining high performance and stable perovskite devices. Herein, high-quality perovskite films were successfully prepared by a liquid nitrogen assisted method (LN method). Here, the vaporization of liquid nitrogen reduces the ambient temperature and absorbs thermal energy from the substrate surface to increase the nucleation speed of perovskite. The scanning electron microscopy results showed that CH 3 NH 3 PbI 3 perovskite films prepared by the liquid nitrogen assisted method were dense and pinhole-free. The devices prepared by the LN method result in a high performance with the power conversion efficiency (PCE) up to 16.53%, and the performance could maintain more than 89% of the primary PCE after 30 days storage in a desiccator at room temperature.

    DOI: 10.1021/acssuschemeng.8b05139

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  • Nanowire-Templated Synthesis of FeN <inf>x</inf> -Decorated Carbon Nanotubes as Highly Efficient, Universal-pH, Oxygen Reduction Reaction Catalysts 査読有り

    Li Y., Huang H., Chen S., Wang C., Ma T.

    Chemistry - A European Journal   25 ( 10 )   2637 - 2644   2019年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim It is of increasing importance to develop highly active and economical oxygen reduction reaction (ORR) electrocatalysts, which have great significance for the large-scale implementation of various energy conversion systems, including metal–air batteries and fuel cells. Herein, a novel method to synthesize FeN x -decorated carbon nanotubes as a high-efficiency ORR catalyst, by utilizing ZnO nanowires as a sacrificial template and a Fe–polydopamine complex as metal and carbon sources, is reported. The obtained catalyst shows great potential for replacing Pt/C as the ORR catalyst under various pH conditions, from alkaline to acidic electrolytes. The high conductivity, large surface area of the carbon nanotube, and highly active FeN x species contributed greatly to the high performance of the catalyst. The work presented herein paves a new way for the synthesis of 1D porous nanomaterials for a broad range of energy-related applications.

    DOI: 10.1002/chem.201805716

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  • Killing Two Birds with One Stone: A Highly Active Tubular Carbon Catalyst with Effective N Doping for Oxygen Reduction and Hydrogen Evolution Reactions 査読有り

    Li Y., Huang H., Chen S., Wang C., Liu A., Ma T.

    Catalysis Letters   149 ( 2 )   486 - 495   2019年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018, Springer Science+Business Media, LLC, part of Springer Nature. Abstract: The oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are two of the core reactions that occur in fuel cells and water electrolysis devices. Heteroatom-doped carbon materials are promising metal-free electrocatalysts to improve the conversion efficiency of these devices. To optimize the nanostructures of such carbon-based catalysts, herein, we reported an effective template method to synthesize N doped carbon nanotubes by using polydopamine as a precursor. The use of the ZnO nanowire not only serves as a self-sacrificial template to direct the formation of the nanotube, but also greatly extends the porosity of the carbon nanotube. Moreover, the polydopamine precursor also leads to effective N doping. An optimized sample, NCNT-900, shows high ORR performance comparable with that of Pt/C as well as good HER performance in both alkaline and acid media, making it one of the most effective carbon-based HER catalysts. This strategy offers an opportunity to synthesize catalysts with higher activity by rational design of a carbon precursor with higher N content or multi-heteroatom co-doping. Graphical Abstract: [Figure not available: see fulltext.].

    DOI: 10.1007/s10562-018-2636-5

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  • In-situ growth of nanowire WO<inf>2.72</inf> on carbon cloth as a binder-free electrode for flexible asymmetric supercapacitors with high performance 査読有り

    Huang X., Zhang Z., Li H., Wang H., Ma T.

    Journal of Energy Chemistry   29   58 - 64   2019年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences For the first time, WO2.72 nanowires were in-situ grown on carbon cloth by a simple solvothermal reaction. The nanowire WO2.72/carbon cloth (NW WO2.72/CC) electrode showed good electrochemical performance with specific capacitance (Cs) reaching up to 398 F g−1 at a current density of 2 A g−1. The capacitance of 240 F g−1 was retained at a high current density of 16 A g−1. To further evaluate the energy storage performance, flexible asymmetric supercapacitors (FASCs) were fabricated using the activated carbon/carbon cloth (AC/CC) as negative electrode and NW WO2.72/CC as positive electrode, respectively. The FASCs delivered a high energy density of 28 Wh kg−1 at a power density of 745 W kg−1 and 13 Wh kg−1 even at a high power density of 22.5 kW kg−1. More impressively, 81% of the specific capacitance of the FASCs was retained after 10,000 cycles, indicating excellent cycle stability. This work indicates the NW WO2.72/CC holds a great potential for application in energy storage devices.

    DOI: 10.1016/j.jechem.2018.01.024

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  • The Role of Lanthanum in a Nickel Oxide-Based Inverted Perovskite Solar Cell for Efficiency and Stability Improvement 査読有り

    Teo S., Guo Z., Xu Z., Zhang C., Kamata Y., Hayase S., Ma T.

    ChemSusChem   12 ( 2 )   518 - 526   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim A high-performing inverted perovskite solar cell (PSC) always relies on the hole transporting layer (HTL) quality and its interfaces. This work investigates the impact of La incorporation within the NiOx matrix for defects passivation, thus leading to high charge extraction ability and stability without compromising its power conversion efficiency. In the presence of La, the La–NiOx quality is clearly improved; without the formation of pinholes. In addition, the inclusion of La alters the energy band alignment; consequently, enhancing the hole transportation and widening the Voc (>1 V), as compared to the pristine NiOx. The beneficial effect of La was further revealed through the photoluminescence measurement and density of states (DOS) analysis, in which trap states are passivated by La. More importantly, the perovskite solar cell, with La–NiOx as the HTL, exhibits 21 % enhancement in efficiency and a remarkable stability that is greater than that of pristine NiOx. This also unlocks an opportunity for commercialization.

    DOI: 10.1002/cssc.201802231

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  • A facile approach for the fabrication of loading-controlled Ag/C foam catalyst 査読有り

    Liu A., Ren X., Yao Y., Yang Q., Gao M., Yang Y., Guo J., Li Y., Gao L., Ma T.

    Ionics   25 ( 1 )   361 - 365   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. A loading-controlled Ag/C foam catalyst prepared by facile electrochemical growth in an environmentally friendly electrolyte with 5,5-dimethylhydantoin (DMH) and niacin (NA) as complexing agents is reported. By controlling the cathodic current density and the growth time, the loading amount of silver on carbon support can be easily controlled. Ag/C foam catalyst with small size, ideal distribution, and controllable loading amount of Ag particles can be obtained on foam carbon support.

    DOI: 10.1007/s11581-018-2769-y

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  • Free-standing NiCo <inf>2</inf> S <inf>4</inf> @VS <inf>2</inf> nanoneedle array composite electrode for high performance asymmetric supercapacitor application 査読有り

    Zhang Z., Huang X., Wang H., Teo S., Ma T.

    Journal of Alloys and Compounds   771   274 - 280   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Two-dimensional (2D) VS 2 nanosheets along the NiCo 2 S 4 needle arrays were prepared via an in situ sulfurization-assisted hydrothermal process. The unique nanostructure and phase were characterized by using field effect scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction. The electrochemical properties were recorded by cyclic voltammetry, charge/discharge curves, and electrochemical impedance spectroscopy. The binder-free NiCo 2 S 4 @VS 2 electrode has contributed to a high specific capacity of 1023. 4 C g −1 with remarkable stability where 96% of its capacity retained after 2000 cycles at the current density of 0.45 A g −1 due to the synergetic effects. Promoting for practical applications, an asymmetric supercapacitor (ASC) composed of NiCo 2 S 4 @VS 2 as the positive electrode and activated carbon (AC) as the negative electrode with polypropylene as the separator was fabricated. The assembled ASC contributed to a maximum energy density of 31.2 Wh kg −1 at the power density of 775 W kg −1 with good stabilities under different current densities. Thereby, this rational design provides a new strategy for synthesizing electrode materials for high-performance supercapacitors.

    DOI: 10.1016/j.jallcom.2018.08.325

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  • Structured crystallization for efficient all-inorganic perovskite solar cells with high phase stability 査読有り

    Wang Z., Baranwal A., Kamarudin M., Kamata Y., Ng C., Pandey M., Ma T., Hayase S.

    Journal of Materials Chemistry A   7 ( 35 )   20390 - 20397   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry 2019. All-inorganic perovskites suffer from a phase transition from a cubic α-phase to a tetragonal δ-phase in the ambient atmosphere, although they have the advantage of higher thermal stability. Here, we demonstrated that yttrium-induced perovskite crystallization results in significantly improved phase stability of perovskite even under humid air conditions. Yttrium in precursors was found to impede the crystal growth of perovskite film to stabilize the α-phase of a CsPbI2Br phase and was finally incorporated into the CsPbI2Br perovskite lattice. This structural crystallization process induced by yttrium incorporation gave rise to denser compact films with small grains and host lattice rearrangement by partial substitution for Pb. As a result, a 360-fold phase stability improvement was achieved in humid air with 65% RH compared with the reference film. The favorable electronic structure for efficient electron-hole dissociation and carrier transport to the cathode led to a much-enhanced power conversion efficiency (PCE) of 13.25% after yttrium incorporation compared with only 8.46% for the reference cells in humid air. Moreover, yttrium-incorporated perovskite solar cells (PSCs) without encapsulation exhibited superior long-term stability when stored in ambient air with 65% RH, showing nearly no degradation over 14 h.

    DOI: 10.1039/c9ta05556h

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  • 2D nanoplate assembled nitrogen doped hollow carbon sphere decorated with Fe<inf>3</inf>O<inf>4</inf> as an efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries 査読有り

    Li Y., Huang H., Chen S., Yu X., Wang C., Ma T.

    Nano Research   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. Designing a highly efficient non-precious based oxygen reduction reaction (ORR) electrocatalyst is critical for the commercialization of various sustainable energy storage and conversion devices such as metal-air batteries and fuel cells. Herein, we report a convenient strategy to synthesis Fe3O4 embedded in N doped hollow carbon sphere (NHCS) for ORR. What’s interesting is that the carbon microsphere is composed of two-dimensional (2D) nanoplate that could provide more exposed active sites. The usage of solid ZnO nanowires as zinc source is crucial to obtain this structure. The Fe3O4@NHCS-2 exhibits better catalytic activity and durability than the commercial Pt/C catalyst. Moreover, it further displays high-performance of Zn-air batteries as a cathode electrocatalyst with a high-power density of 133 mW·cm−2 and high specific capacity of 701 mA·h·g−1. The special hollow structure composed 2D nanoplate, high surface area, as well as synergistic effect between the high active Fe3O4 nanoparticles and N-doped matrix endows this outstanding catalytic activity. The work presented here can be easily extended to prepare metal compounds decorated carbon nanomaterials with special structure for a broad range of energy storage and conversion devices. [Figure not available: see fulltext.].

    DOI: 10.1007/s12274-019-2512-7

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  • Achievable high: V <inf>oc</inf> of carbon based all-inorganic CsPbIBr<inf>2</inf> perovskite solar cells through interface engineering 査読有り

    Guo Z., Teo S., Xu Z., Zhang C., Kamata Y., Hayase S., Ma T.

    Journal of Materials Chemistry A   7 ( 3 )   1227 - 1232   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Royal Society of Chemistry. In this work, a simple interface engineering process for SnO2 electron selective layer (ESL) surface passivation employing a SnCl2 solution is introduced, which has successfully reduced the energy loss for a high open-circuit voltage (Voc) output and consequently improved the performance of all-inorganic CsPbIBr2 perovskite solar cells (PSCs). It was found that surface passivation can effectively suppress the recombination process at the interface between the perovskite and SnO2 due to higher recombination resistance. The shorter PL decay time is attributed to the excellent electron extraction from the perovskite film. After optimizing surface passivation, the power conversion efficiency (PCE) was enhanced from 4.73% to 7.00% and a high Voc of 1.31 V was achieved, which is one of the highest Voc values reported for inorganic Cs-based PSCs. More importantly, the passivated SnO2 based device retains 95.5% of its initial performance at 90 °C in air without encapsulation. This work provides a simple and efficient interface engineering method to improve the Voc and efficiency of all-inorganic PSCs.

    DOI: 10.1039/c8ta09838g

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  • Passivation of Grain Boundary by Squaraine Zwitterions for Defect Passivation and Efficient Perovskite Solar Cells 査読有り

    Wang Z., Pradhan A., Kamarudin M., Pandey M., Pandey S., Zhang P., Ng C., Tripathi A., Ma T., Hayase S.

    ACS Applied Materials and Interfaces   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2019 American Chemical Society. Unavoidable defects in grain boundaries (GBs) are detrimental and critically influence the organometal halide perovskite performance and stability. To address this issue, semiconducting molecules have been employed to passivate traps along perovskite GBs. Here, we designed and synthesized three squaraine molecules (SQ) with zwitterionic structure to interact with under-coordinated Pb 2+ and passivate Pb-I antisite defects. Density functional theory calculation shows symmetric O atoms could coordinate with perovskite grains simultaneously, resulting in continuous charge distribution at the SQ-perovskite interface. The energetic traps distribution in CH 3 NH 3 PbI 3 perovskite is influenced significantly by the interaction between SQ and perovskite as analyzed by thermally stimulated current, in which the deep-level defects are considerably reduced due to efficient SQ passivation. In addition, we explore how SQ molecules with different energy offset affect the charge extraction, which is suggested to facilitate exciton separation at the perovskite-SQ interface. These benefits lead to enhanced perovskite efficiency from 15.77 to 18.83% with the fill factor approaching 80%, which is among the highest efficiency reported for MAPbI 3 solar cells fabricated in an ambient environment at 60% relative humidity (RH). Considerable retardation of perovskite device degradation was achieved, retaining 90% of initial efficiency when kept 600 h at 60 ± 5% RH.

    DOI: 10.1021/acsami.8b22044

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  • Development of a mixed halide-chalcogenide bismuth-based perovskite MABiI <inf>2</inf> S with small bandgap and wide absorption range 査読有り

    Zhang C., Teo S., Guo Z., Gao L., Kamata Y., Xu Z., Ma T.

    Chemistry Letters   48 ( 3 )   249 - 252   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Chemical Society of Japan. During the last years, lead perovskites have achieved high power conversion efficiency of 23%. However, their long-term stability and toxicity are still crucial issues that required attention. In this study, we are the first to report on the synthesis and characterizations of a new lead-free mixed halide-chalcoge-nide perovskite MABiI 2 S (MBIS), and have determined its physical and optical properties by various testing methods. The MBIS has a low bandgap of 1.52 eV, with an extended absorption onset up to over 1000 nm. Solar cells fabricated with the MBIS were inspected and device improvements were applied.

    DOI: 10.1246/cl.180919

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  • Current progress in interfacial engineering of carbon-based perovskite solar cells 査読有り

    Meng F., Liu A., Gao L., Cao J., Yan Y., Wang N., Fan M., Wei G., Ma T.

    Journal of Materials Chemistry A   7 ( 15 )   8690 - 8699   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Royal Society of Chemistry. Using carbon paste as the back electrode for perovskite solar cells (C-PSCs) has attracted significant attention due to their low cost and excellent stability. In general, the device structure of the fabricated C-PSCs is hole transport layer (HTL) free, and the carbon paste electrodes (CPEs) could directly collect the photo-generated holes. Therefore, interfacial engineering between the perovskite and CPE plays a crucial role in charge collection and affects the performance of C-PSCs. Many studies have been carried out in interfacial engineering so far; however, no review has summarized the work done in this field. Herein, we summarize the continuing progress in interfacial engineering of C-PSCs. Two kinds of contacts have been defined due to the different interfacial contacts in C-PSCs: bi-interfacial and tri-interfacial structures. Techniques for the fabrication of perovskite layers, CPEs, and insulating layers have been discussed for each structure, including the main issues and solutions. Finally, conclusions and perspectives are provided for the future designs and development of C-PSCs.

    DOI: 10.1039/c9ta01364d

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  • Melamine Hydroiodide Functionalized MAPbI<inf>3</inf> Perovskite with Enhanced Photovoltaic Performance and Stability in Ambient Atmosphere 査読有り

    Yang F., Kamarudin M.A., Hirotani D., Zhang P., Kapil G., Ng C.H., Ma T., Hayase S.

    Solar RRL   3 ( 1 )   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Despite the remarkable performance of organometallic halide perovskite solar cells (PSCs), their ultimate stability is still a major issue that inhibits the commercialization of this eminent technology. Herein, melamine hydroiodide (MLAI) is added to function methyl ammonium (CH3NH3+, MA+) lead iodide perovskite for fabricating structured perovskite with enhanced photovoltaic performance and stability in the harsh ambient atmosphere (35 °C, 60–70% relative humidity). Nearly no new phase formed even incorporated 25 mol.% MLAI induces the strain in the perovskite crystal structure. The MLAI-structured perovskite film shows a denser and smoother surface than the pristine MAPbI3 perovskite. Planar PSCs based on 2 mol.% MLAI-functionalized perovskite show 17.2% power conversion efficiency with nearly no hysteresis which is much higher than pristine MAPbI3 PSCs. Most importantly, the solar cell devices based on 2 mol.% MLAI-functionalized perovskite still retain over 90% of the initial performance after being kept in ambient atmosphere for more than 560 h without encapsulation.

    DOI: 10.1002/solr.201800275

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  • Highly accessible hierarchical porous carbon from a bi-functional ionic liquid bulky gel: high-performance electrochemical double layer capacitors 査読有り

    Yan Y., Hao X., Gao L., Lin S., Cui N., Li Y., Hao C., Ma T., Wang H.

    Journal of Materials Chemistry A   7 ( 44 )   25297 - 25304   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Royal Society of Chemistry. The π-π interactions between graphene-based lamellar materials hinder their application in high-energy-density electrochemical double-layer capacitors (EDLCs) due to the limited surface area and mismatched pore size with ionic liquid electrolytes. Ionic liquid-graphene bulky gels work well in inhibiting the aggregation of graphene layers. Herein, we report an in situ one-pot process involving the carbonizing of an ionic liquid-based bulky gel to realize an unstacked 2D nanosheet structure and hierarchical porous design. The bulky gel formed by the ionic liquid ensures the stabilization of the laminated structure and regulates the size of the pores in situ. The facile process ensures that the as-synthesized 2D graphene-based porous carbon (GGI) possesses high surface area, dual-doping and micro/mesopores. The highly accessible GGI exhibited good compatibility with the ionic liquid electrolyte EmimTFSI. The constructed symmetric supercapacitors showed a high capacitance of 301 F g-1 at 0.5 A g-1, an excellent rate capability (maintained 192 F g-1 at 10 A g-1) and long cycle life (91.4% performance retention after 10 000 cycles). The high energy density of 100.3 W h kg-1 indicates the successful construction of the EDLC devices.

    DOI: 10.1039/c9ta07820g

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  • Energy- and cost-efficient NaCl-assisted synthesis of MAX-phase Ti<inf>3</inf>AlC<inf>2</inf> at lower temperature 査読有り

    Liu A., Yang Q., Ren X., Meng F., Gao L., Gao M., Yang Y., Ma T., Wu G.

    Ceramics International   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 Elsevier Ltd and Techna Group S.r.l. Ti3C2, produced by selective etching of Al from MAX-phase Ti3AlC2, is the most widely studied two-dimensional MXene material in many research fields. However, the synthesis of highly pure Ti3AlC2 typically requires high temperatures, resulting in high-energy demands and high production costs. To reduce the synthesis temperature, we present a new NaCl-assisted approach for synthesizing Ti3AlC2. Ti3AlC2 was synthesized from a Ti2AlC–TiC mixture at 1150 °C under an argon atmosphere in a tube furnace. The successful synthesis of highly pure Ti3AlC2 with an ideal crystal structure and the subsequent preparation of Ti3C2 were confirmed by material characterization and simulation results. This molten-salt-assisted method is more efficient in terms of energy and cost because it lowers the synthesis temperature of MAX-phase Ti3AlC2 by 200 °C. When assisted by appropriate kind or quantity of molten-salt, the synthesis temperature and synthesis time may be further reduced. These findings may provide a new approach for lower-temperature synthesis of other MAX-phase materials and greatly widen the applications of MAX and MXene materials.

    DOI: 10.1016/j.ceramint.2019.11.008

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  • Carbon Counter Electrodes in Dye-Sensitized and Perovskite Solar Cells 査読有り

    Wu M., Sun M., Zhou H., Ma J., Ma T.

    Advanced Functional Materials   2019年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Developing highly effective and stable counter electrode (CE) materials to replace rare and expensive noble metals for dye-sensitized and perovskite solar cells (DSC and PSC) is a research hotspot. Carbon materials are identified as the most qualified noble metal-free CEs for the commercialization of the two photovoltaic devices due to their merits of low cost, excellent activity, and superior stability. Herein, carbonaceous CE materials are reviewed extensively with respect to the two devices. For DSC, a classified discussion according to the morphology is presented because electrode properties are closely related to the specific porosity or nanostructure of carbon materials. The pivotal factors influencing the catalytic behavior of carbon CEs are also discussed. For PSC, an overview of the new carbon CE materials is addressed comprehensively. Moreover, the modification techniques to improve the interfacial contact between the perovskite and carbon layers, aiming to enhance the photovoltaic performance, are also demonstrated. Finally, the development directions, main challenges, and coping approaches with respect to the carbon CE in DSC and PSC are stated.

    DOI: 10.1002/adfm.201906451

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  • Alternative electrodes for HTMs and noble-metal-free perovskite solar cells: 2D MXenes electrodes 査読有り

    Cao J., Meng F., Gao L., Yang S., Yan Y., Wang N., Liu A., Li Y., Ma T.

    RSC Advances   9 ( 59 )   34152 - 34157   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Royal Society of Chemistry. The high cost of hole transporting materials (HTMs) and noble metal electrodes limits the application of perovskite solar cells (PSCs). Carbon materials have been commonly utilized for HTMs and noble-metal-free PSCs. In this paper, a more conductive 2D MXene material (Ti3C2), showing a similar energy level to carbon materials, has been used as a back electrode in HTMs and noble-metal-free PSCs for the first time. Seamless interfacial contact between the perovskite layer and Ti3C2 material was obtained using a simple hot-pressing method. After the adjustment of key parameters, the PSCs based on the Ti3C2 electrode show more stability and higher power conversion efficiencies (PCE) (13.83%, 27% higher than that (10.87%) of the PSCs based on carbon electrodes) due to the higher conductivity and seamless interfacial contact of the MXene electrode. Our work proposes a promising future application for MXene and also a good electrode candidate for HTM and the noble-metal-free PSCs.

    DOI: 10.1039/c9ra06091j

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  • Photoinduced polyacrylate based polymer electrolyte for quasi-solid state dye sensitized solar cell application 査読有り

    Xu T., Kong D., Xi Z., Huang T., Qin X., Wu H., Kou K., Wang R., Chen L., Ma T.

    Engineered Science   7   17 - 25   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A novel polymer electrolyte poly(NAG) prepared from commercially available transparent photocurable nail art glue NAG is successfully developed for quasi-solid state dye sensitized solar cells (QS-DSSCs) application. The functional component in this poly(NAG) is revealed to be acrylate based group from the Fourier transform infrared spectroscopy (FTIR) measurement. Water contact angles tests showthe poly(NAG) films displayed contact angle less than 20° when dripping liquid electrolyte containing iodide/tri-iodide redox couple. Meanwhile, electrochemical properties of poly(NAG) polymer based electrolyte are thoroughly investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The poly(NAG) polymer electrolyte presents an a highest ionic conductivity of 0.51 mS·cm at room-temperature. Solar cell based on the poly(NAG) electrolyte reaches power conversion efficiency (PCE) of 1.46%. This work demonstrates that this NAG is a novel, cheap, environmental friendly and efficient precursor for preparing polymer electrolyte for DSSCs application. Its abundance can significantly reduce cell fabrication cost, and this work opens a new way to look for promising resource for the application of DSSCs. -1

    DOI: 10.30919/es8d768

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  • Perovskite solar cell for space application 査読有り

    Bautista I.Z.C., Shuzhang Y., Ma T., Cho M.

    Proceedings of the International Astronautical Congress, IAC   2019-October   2019年01月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Satellite developers are continuously doing research on satellite energy sources that are efficient, lightweight and cheap than the current Silicon and triple-junction solar cells being used. The emergence of organic-inorganic metal halide Perovskite solar cells (PSC) which, have high specific power (kW/kg), achieved record power conversion efficiencies greater than 22% and cheap to manufacture, has attracted the attention of scientists for its possibility to replace silicon and triple junction solar cells. These factors make Perovskite solar cells viable candidates for space applications. To determine the feasibility of PSCs in space, samples were tested under simulated Low Earth Orbit (LEO) space environment such as thermal cycle, vacuum, vibration, total ionization dosage and electron radiation. Results showed that PSC has the ability to survive and work in space with thermal variation having the largest effect on the performance of the PSC.

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  • Indium Zinc Oxide Electron Transport Layer for High-Performance Planar Perovskite Solar Cells 査読有り

    Wang L.

    Journal of Physical Chemistry C   122 ( 50 )   28491 - 28496   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 American Chemical Society. Besides the high-quality perovskite light absorbing layer, the electron and hole transport layers also play significant roles in achieving high-efficiency planar perovskite solar cells (PVSCs). In this study, a facile, environmentally friendly, one-step spinning coating method is employed to fabricate high-quality indium zinc oxide (IZO) electron transport layer (ETL). Improvements in charge transport, conductivity, and light transmittance of IZO ETL relative to that of TiO2-ETL should be responsible for the large short circuit current density of PVSCs. Using this optimized IZO ETL film, a high-power conversion efficiency (PCE) of 16.25% was achieved, which resulted in an absolute efficiency gain of 2.42% compared with TiO2-based PVSC (13.83%). A steady-state efficiency of 15.8% with negligible hysteresis was also demonstrated.

    DOI: 10.1021/acs.jpcc.8b08869

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  • One-pot synthesis of 2D Ti <inf>3</inf> C <inf>2</inf> /Ni <inf>2</inf> CO <inf>3</inf> (OH) <inf>2</inf> composite as electrode material with superior capacity and high stability for hybrid supercapacitor 査読有り

    Guo J., Zhao Y., Jiang N., Liu A., Gao L., Li Y., Wang H., Ma T.

    Electrochimica Acta   292   168 - 179   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Elsevier Ltd MXene-based materials are promising electrode materials for supercapacitors. Herein, Ni 2 CO 3 (OH) 2 nanosheets and/or nanoparticles are in-situ grown on the surface of two-dimensional (2D) Ti 3 C 2 to form Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composites during one-pot hydrothermal processing. The uniform distribution of Ni 2 CO 3 (OH) 2 on Ti 3 C 2 is due to the electrostatic interaction between positively charged nickel ions and negatively charged Ti 3 C 2 . Importantly, the electrochemical performance of Ti 3 C 2 /Ni 2 CO 3 (OH) 2 are enhanced. The 30-Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite electrode exhibits a specific capacity of 173.8 mAh g −1 at 1 A g −1 and excellent cycling stability (capacity retention of 80.1% after 5000 cycles at 10 A g −1 ). The hybrid supercapacitor using 30-Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite as positive electrode and active carbon as negative electrode delivers a high energy density of 28.2 Wh kg −1 at a power density of 374.8 W kg −1 . The super performance of the composite electrode is attributed to the synergistic effects of good redox activity of Ni 2 CO 3 (OH) 2 particles combined with high electronic conductivity of 2D Ti 3 C 2 . The excellent electrochemical performance of Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite indicates its potential as a promising electrode material to high energy/power density energy storage devices.

    DOI: 10.1016/j.electacta.2018.09.148

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  • Interfacial Sulfur Functionalization Anchoring SnO<inf>2</inf> and CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf> for Enhanced Stability and Trap Passivation in Perovskite Solar Cells 査読有り

    Wang Z., Kamarudin M., Huey N., Yang F., Pandey M., Kapil G., Ma T., Hayase S.

    ChemSusChem   11 ( 22 )   3941 - 3948   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Trap states at the interface or in bulk perovskite materials critically influence perovskite solar cells performance and long-term stability. Here, a strategy for efficiently passivating charge traps and mitigating interfacial recombination by SnO2 surface sulfur functionalization is reported, which utilizes xanthate decomposition on the SnO2 surface at low temperature. The results show that functionalized sulfur atoms can coordinate with under-coordinated Pb2+ ions near the interface. After device fabrication under more than 60 % humidity in ambient air, the efficiency of methylammonium lead iodide (MAPbI3) perovskite solar cells based on sulfur-functionalized SnO2 increased from 16.56 % to 18.41 % with suppressed hysteresis, which resulted from the accelerated interfacial charge transport kinetics and decreased traps in bulk perovskite by interfacial sulfur functionalization. Additionally, thermally stimulated current studies show the decreased trap density in the shallow trap area after interfacial sulfur functionalization. The interfacial sulfur functionalized solar cells without sealing also exhibited considerable retardation of solar cell degradation with only 10 % degradation after 70 days air storage. This work demonstrates a facile sulfur functionalization strategy by using xanthate decomposition on SnO2 surfaces to obtain highly efficient perovskite solar cells.

    DOI: 10.1002/cssc.201801888

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  • High Electrical Conductivity 2D MXene Serves as Additive of Perovskite for Efficient Solar Cells 査読有り

    Guo Z., Gao L., Xu Z., Teo S., Zhang C., Kamata Y., Hayase S., Ma T.

    Small   14 ( 47 )   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim MXenes, a newly intriguing family of 2D materials, have recently attracted considerable attention owing to their excellent properties such as high electrical conductivity and mobility, tunable structure, and termination groups. Here, the Ti3C2Tx MXene is incorporated into the perovskite absorber layer for the first time, which aims for efficiency enhancement. Results show that the termination groups of Ti3C2Tx can retard the crystallization rate, thereby increasing the crystal size of CH3NH3PbI3. It is found that the high electrical conductivity and mobility of MXene can accelerate the charge transfer. After optimizing the key parameters, 12% enhancement in device performance is achieved by 0.03 wt% amount of MXene additive. This work unlocks opportunities for the use of MXene as potential materials in perovskite solar cell applications.

    DOI: 10.1002/smll.201802738

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  • Addition Effect of Pyreneammonium Iodide to Methylammonium Lead Halide Perovskite-2D/3D Heterostructured Perovskite with Enhanced Stability 査読有り

    Yang F., Zhang P., Kamarudin M., Kapil G., Ma T., Hayase S.

    Advanced Functional Materials   28 ( 46 )   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Despite the eminent performance of the organometallic halide perovskite solar cells (PSCs), the poor stability for humidity and ultraviolet irradiation is still major problem for the commercialization of PSCs. Herein, a novel functional organic compound 1-(ammonium acetyl)pyrene is successfully introduced for preparing the 2D/3D heterostructured MAPbI3 perovskite. Because of the functional organic pyrene group with high humidity resistance and strong absorption in the ultraviolet region, the 2D/3D perovskite film shows notable stability with no degradation in ≈60% relative humidity after even six months and exhibits a high ultraviolet irradiation stability which keeps nearly no degradation after 1 h in the UV Ozone treatment. Planar PSCs are fabricated in the ≈60% relative humidity air outside glovebox. The champion efficiency of (PEY2PbI4)0.02MAPbI3 perovskite solar cells is 14.7% with nearly no hysteresis which is equal performance of 3D MAPbI3 devices (15.0%). This work presents a new direction for enhancing the solar cells' performance and stability by incorporating a functional organic aromatic compound into the perovskite layer.

    DOI: 10.1002/adfm.201804856

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  • In Situ Growth of a Feather-like MnO <inf>2</inf> Nanostructure on Carbon Paper for High-Performance Rechargeable Sodium-Ion Batteries 査読有り

    Li H., Liu A., Zhao S., Guo Z., Wang N., Ma T.

    ChemElectroChem   5 ( 21 )   3266 - 3272   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Recently, sodium-ion batteries have attracted great attention, owing to the rich resource and low cost. In the present work, a feather-like MnO 2 nanostructure was prepared directly on carbon paper by using a rapid and simple hydrothermal route for the first time. The formation mechanism was proposed by investigating the intermediate products during the reaction. When applied as an anode for a sodium-ion battery, the feather-like MnO 2 nanostructure on carbon paper exhibited a high discharge capacity, good rate reversibility, and long-term cycling stability. A high specific capacity of approximately 300 mAh g −1 could be obtained even after cycling 400 times with a current density of 0.1 A g −1 . Furthermore, the Na + storage mechanism of MnO 2 on carbon paper in the sodium-ion battery was also investigated in this work. Such high performance can be attributed to the porous structure of the substrate and high specific surface area of the feather-like nanostructure.

    DOI: 10.1002/celc.201800830

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  • Enhanced performance of ZnO based perovskite solar cells by Nb <inf>2</inf> O <inf>5</inf> surface passivation 査読有り

    Zhang P., Yang F., Kapil G., Shen Q., Toyoda T., Yoshino K., Minemoto T., Pandey S., Ma T., Hayase S.

    Organic Electronics: physics, materials, applications   62   615 - 620   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Elsevier B.V. TiO 2 has been extensively utilized as bottom electron transporting scaffold for perovskite solar cells (PSCs) but need for its high processing temperature (>450 °C) hinders its applicability for the flexible plastic substrates. Use of the low temperature processed ZnO is one of the probable solutions as electron transport layer (ETL) in PSCs owing to its high electron mobility. An amicable solution for the instability of the perovskite absorber layers fabricated on to ZnO leading resulting in to poor power conversion efficiency (PCE) and long-term stability is necessary for to harness the benefit of ZnO as ETL in PSCs. Herein, we modified the ZnO surface by spin-coating an ultrathin Nb 2 O 5 as surface passivation layer. In this work, both of the ZnO and Nb 2 O 5 were fabricated by spin coating and sintered at relatively lower temperature of 200 °C. Utilizing this Nb 2 O 5 surface passivated and low temperature processed ZnO as ETL, dramatically enhanced stability of perovskite film over 20 days under ambient condition has been clearly demonstrated. This bilayer of Nb 2 O 5 surface passivated ZnO scaffold used for fabrication of the planer heterojunction PSCs based on CH 3 NH 3 PbI 3 , led to the maximum PCE of 14.57% under simulated solar irradiation for an optimized ZnO thickness of 42 nm. Moreover, implication of the surface passivation of ZnO by Nb 2 O 5 leading to the formation of highly crystalline, stable and dense perovskite film has been probed by SEM and XRD investigations.

    DOI: 10.1016/j.orgel.2018.06.038

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  • In situ fabrication of 2D SnS <inf>2</inf> nanosheets as a new electron transport layer for perovskite solar cells 査読有り

    Zhao E., Gao L., Yang S., Wang L., Cao J., Ma T.

    Nano Research   11 ( 11 )   5913 - 5923   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. To promote commercialization of perovskite solar cells (PSCs), low-temperature processed electron transport layer (ETL) with high carrier mobility still needs to be further developed. Here, we reported two-dimensional (2D) tin disulfide (SnS 2 ) nanosheets as ETL in PSCs for the first time. The morphologies of the 2D SnS 2 material can be easy controlled by the in situ synthesized method on the conductive fluorine-doped tin oxide (FTO) substrate. We achieved a champion power conversion efficiency (PCE) of 13.63%, with the short-circuit current density (J SC ) of 23.70 mA/cm 2 , open-circuit voltage (V OC ) of 0.95 V, and fill factor (FF) of 0.61. The high J SC of PSCs results from effective electron collection of the 2D SnS 2 nanosheets from perovskite layer and fast electron transport to the FTO. The low V OC and FF are the results of the lower conduction band of 2D SnS 2 (4.23 eV) than that of TiO 2 (4.0 eV). These results demonstrate that 2D material is a promising candidate for ETL in PSCs. [Figure not available: see fulltext.].

    DOI: 10.1007/s12274-018-2103-z

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  • One-step salt-assisted solution combustion synthesis of Ni-based composites for use as supercapacitor electrodes 査読有り

    Zhao Y., Jiang N., Zhang X., Guo J., Yang Q., Gao L., Li Y., Ma T.

    Journal of Alloys and Compounds   765   396 - 404   2018年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Elsevier B.V. Low cost mass production of Ni-based composites on an industrial scale with high electrochemical performance is of practical interest for supercapacitors. In this report, various Ni-based composites containing Ni2(CO3)(OH)2, Ni3(NO3)2(OH)4, NiC2O4or NiO have been successfully synthesized via a one-step salt-assisted solution combustion synthesis at a temperature of 215 °C. The morphology and chemical composition of the as-obtained products can be controlled by monitoring the reaction parameters inclusive of the initial concentration of salt solution, and salt species. NC-1.0 composite obtained by salt-assisted solution combustion synthesis delivers higher specific capacitance (1420 F g−1at 1 A g−1), and better cycling performance (60.0% after 2000 cycles) than those of NC-0.0 (1260 F g−1at 1 A g−1, 53.6% after 2000 cycles) achieved by conventional solution combustion synthesis. Hybrid supercapacitor with NC-1.0 composite as positive electrode and active carbon as negative electrode delivers high energy density (32.5 Wh kg−1at a power density of 310.2 W kg−1). The performance of the obtained Ni-based composites as supercapacitor electrodes demonstrates their potential for upcoming electronic devices.

    DOI: 10.1016/j.jallcom.2018.06.166

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  • Pr/Ba cation-disordered perovskite Pr<inf>2</inf>/<inf>3</inf>Ba<inf>1</inf>/<inf>3</inf>CoO<inf>3</inf><sup>1</sup><inf>δ</inf> as a new bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions 査読有り

    Zhang W., Shiraiwa M., Wang N., Ma T., Fujii K., Niwa E., Yashima M.

    Journal of the Ceramic Society of Japan   126 ( 10 )   814 - 819   2018年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    ©2018 The Ceramic Society of Japan. Electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) play an important role in renewable energy source technologies, typically including metal-air batteries, fuel cells and water splitting devices. Therefore, the development of bifunctional catalysts for OER and ORR is of great importance to enhance the performance of these devices. Herein, we present a Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO31δ, as a novel bifunctional catalyst for OER and ORR. Here δ is the content of oxygen vacancies. Rietveld refinement of the X-ray powder diffraction data of Pr2/3Ba1/3CoO2.98 was successfully performed by a single phase with an orthorhombic Pnma Pr/Ba cation-disordered perovskite-type structure. The bond valence sum of Co cation, 3.11 and thermogravimetric measurements suggested the coexistence of Co3+, Co4+, Pr3+ and Pr4+ cations in the bulk Pr2/3Ba1/3CoO2.98. The X-ray photoemission spectroscopy of Pr2/3Ba1/3CoO2.98 indicated the coexistence of these four cations at the sample surface, which would improve the electrocatalysis. The electrical conductivity · of Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO31δ was higher than that of Pr/Ba cation-ordered layered perovskite PrBaCo2O61δ. The · of Pr2/3Ba1/3CoO31δ and PrBaCo2O61δ decreased with an increase of temperature. The concentration of oxygen vacancies δ of Pr2/3Ba1/3CoO31δ increased with increasing temperature. Electrochemical measurements of the Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO2.98 indicated higher OER and ORR catalytic activities, compared to the Pr/Ba cation-ordered layered perovskite PrBaCo2O61δ. The Pr2/3Ba1/3CoO2.98 exhibited higher bifunctional electrocatalytic activities compared with many bifunctional catalysts in the literature. These results highlight the Pr/Ba cation-disordered perovskite-type Pr2/3Ba1/3CoO31δ as a promising bifunctional catalyst for renewable energy applications.

    DOI: 10.2109/jcersj2.18076

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  • Seamless Interfacial Formation by Solution-Processed Amorphous Hydroxide Semiconductor for Highly Efficient Electron Transport 査読有り

    Yang S., Song X., Gao L., Wang N., Ding X., Wang S., Ma T.

    ACS Applied Energy Materials   1 ( 9 )   4564 - 4571   2018年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2018 American Chemical Society. Reducing the energy barriers for charge carrier injection, extraction, or transport within both electron- and hole-transporting interfaces is crucial for minimizing charge carrier transport losses in perovskite solar cells (PSCs). In this Article, an ultrafast, solution-processed hydroxide semiconductor material, called Nb(OH) 5 , which has a similar energy band and transparency to its crystallization, Nb 2 O 5 , is first used as an electron transport layer (ESL) for PSCs. The conductivity of the Nb(OH) 5 is lower than that of Nb 2 O 5 ; however, a power conversion efficiency (PCE) of approximately 13.62% is obtained by fully fabricating devices at room temperature with a MAPbI 3 light absorption layer, which is almost the same as that of PSCs based on Nb 2 O 5 . The performance of the fabricated device shows that the Nb(OH) 5 film has seamless contact with the fluorine-doped tin oxide (FTO) substrate. The conductivity of the Nb 2 O 5 film is 4 orders larger than that of Nb(OH) 5 ; however, a low interfacial barrier results in interfacial resistance between the Nb(OH) 5 and FTO substrate that is 3-4 orders lower than that of Nb 2 O 5 due to universal quasi-ohmic contacts. By comparing with properties of PSCs with different ESLs (Nb(OH) 5 and Nb 2 O 5 ), a further efficient electron extract principle from the perovskite layer to FTO substrate is promoted. The PCE of PSCs still needs to be improved further; however, this solution-processed hydroxide semiconductor material, Nb(OH) 5 , has shown numerous benefits to PSCs with ultrafast process, low cost, and large-area fabrication.

    DOI: 10.1021/acsaem.8b00681

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  • Low-cost, large-scale, one-pot synthesis of C/Ni <inf>3</inf> (NO <inf>3</inf> ) <inf>2</inf> (OH) <inf>4</inf> composites for high performance supercapacitor 査読有り

    Zhao Y., Jiang N., Zhang X., Guo J., Li Y., Gao L., Wang H., Ma T.

    Materials Chemistry and Physics   217   291 - 299   2018年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Elsevier B.V. In this study, we report a series of carbon/nickel-based composites. The composites are prepared through a facile one-pot solution combustion method by using nickel nitrate hydrate (Ni(NO 3 ) 2 ·6H 2 O) as an oxidizer and glucose (C 6 H 12 O 6 ) as a fuel material. The phase, component and electrochemical capacitive behavior of the as-prepared samples are investigated. The component of the obtained composites could be simply controlled by changing the ratio of NO 3− /C 6 H 12 O 6 . Novel C/Ni 3 (NO 3 ) 2 (OH) 4 composites are obtained at high molar ratio of NO 3− /C 6 H 12 O 6 (larger than 9) for the first time. The as-prepared C/Ni 3 (NO 3 ) 2 (OH) 4 composite shows battery-type behavior and exhibits a specific capacity of 630 C g −1 (1260 F g −1 ) at the current density of 1 A g −1 , which is ca. 2–10 fold higher than those of C/NiO composite (414 C g −1 , 828 F g −1 ) and C/NiO/Ni composite (65 C g −1 , 129 F g −1 ). In addition, C/Ni 3 (NO 3 ) 2 (OH) 4 composite exhibits an excellent rate performance (448 C g −1 , 996 F g −1 at 10 A g −1 ) and good cyclic stability. The results indicate that the C/Ni 3 (NO 3 ) 2 (OH) 4 composite is a potential electrode material for electrochemical supercapacitor. This work also suggests that the solution combustion process is promising for large-scale production of materials for supercapacitors.

    DOI: 10.1016/j.matchemphys.2018.06.082

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  • Solution-Processed Air-Stable Copper Bismuth Iodide for Photovoltaics 査読有り

    Hu Z., Wang Z., Kapil G., Ma T., Iikubo S., Minemoto T., Yoshino K., Toyoda T., Shen Q., Hayase S.

    ChemSusChem   11 ( 17 )   2930 - 2935   2018年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Bismuth-based solar cells have been under intensive interest as an efficient non-toxic absorber in photovoltaics. Within this new family of semiconductors, we herein report a new, long-term stable copper bismuth iodide (CuBiI4). A solutionprocessed method under air atmosphere is used to prepare the material. The adopted HI-assisted dimethylacetamide (DMA) co-solvent can completely dissolve CuI and BiI3 powders with high concentration compared with other organic solvents. Moreover, the high vapor pressure of tributyl phosphate, selected for the solvent vapor annealing (SVA), enables complete low-temperature (≤70 °C) film preparation, resulting in a stable, uniform, dense CuBiI4 film. The average grain size increases with the precursor concentration, greatly improving the photoluminescence lifetime and hall mobility; a carrier lifetime of 3.03 ns as well as an appreciable hall mobility of 110 cm2 V−1s−1 were obtained. XRD illustrates that the crystal structure is cubic (space group Fd3m) and favored in the [1 1 1] direction. Moreover, the photovoltaic performance of CuBiI4 was also investigated. A wide bandgap (2.67 eV) solar cell with 0.82 % power conversion efficiency is presented, which exhibits excellent long-term stability over 1008 h under ambient conditions. This air-stable material may give an application in future tandem solar cells as a stable short-wavelength light absorber.

    DOI: 10.1002/cssc.201800815

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  • Performance Enhancement of Mesoporous TiO <inf>2</inf> -Based Perovskite Solar Cells by SbI <inf>3</inf> Interfacial Modification Layer 査読有り

    Zhang P., Yang F., Kamarudin M., Ng C., Kapil G., Ma T., Hayase S.

    ACS Applied Materials and Interfaces   10 ( 35 )   29630 - 29637   2018年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 American Chemical Society. TiO 2 is commonly used as an electron-transporting material in perovskite photovoltaic devices due to its advantages, including suitable band gap, good photoelectrochemical stability, and simple preparation process. However, there are many oxygen vacancies or defects on the surface of TiO 2 and thus this affects the stability of TiO 2 -based perovskite solar cells under UV light. In this work, a thin (monolayer) SbI 3 modification layer is introduced on the mesoporous TiO 2 surface and the effect at the interface between of TiO 2 and perovskite is monitored by using a quartz crystal microbalance system. We demonstrate that the SbI 3 -modified TiO 2 electrodes exhibit superior electronic properties by reducing electronic trap states, enabling faster electron transport. This approach results in higher performances compared with electrodes without the SbI 3 passivation layer. CH 3 NH 3 PbI 3 perovskite solar cells with a maximum power conversion efficiency of 17.33% in air, accompanied by a reduction in hysteresis and enhancement of the device stability, are reported.

    DOI: 10.1021/acsami.8b10062

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  • Environmental effects on the ionic conductivity of poly(methyl methacrylate) (PMMA)-based quasi-solid-state electrolyte 査読有り

    Xu T., Li J., Gong R., Xi Z., Huang T., Chen L., Ma T.

    Ionics   24 ( 9 )   2621 - 2629   2018年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Quasi-solid-state dye-sensitized solar cells (QS-DSSCs) using polymer electrolytes display excellent long-term stability with comparable light to electricity conversion efficiency (PCE). In this paper, poly(methyl methacrylate) (PMMA) is chosen as the template polymer, and polymer viscosity and its weight percentage of PMMA in the I3−/I−electrolyte system are optimized considering the competitive factors of the ionic conductivity (σ) and gel dimension stability. A systematic study is carried out to study the environmental factors on the ionic conductivity of quasi-solid electrolytes in terms of storage time, thermal stress, and light soaking. In the different temperature range, the polymer presents different aggregation states and molecular motion forms, which results in different conductive mechanism of the gel electrolyte. It could be described by the Arrhenius equation in the sol state and the Vogel–Tammann–Fulcher (VFT) equation on the gel state, respectively. Both the cyclic voltammetry curve and the Tafel polarization curve indicate that the quasi-solid electrolyte exhibits a lower ion diffusion and transport capacity (1.83 × 10−6 cm2/s) than that of the liquid electrolyte (9.15 × 10−6 cm2/s). This work provides new insights about the degradation mechanism of polymer electrolytes for QS-DSSC application. [Figure not available: see fulltext.].

    DOI: 10.1007/s11581-017-2397-y

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  • Study to Observe the Effect of PbI<inf>2</inf>Passivation on Carbon Electrode for Perovskite Solar Cells by Quartz Crystal Microbalance System 査読有り

    Zhang P., Kapil G., Hamada K., Pandey S., Ma T., Hayase S.

    ACS Sustainable Chemistry and Engineering   6 ( 8 )   10221 - 10228   2018年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2018 American Chemical Society. A perovskite solar cell (PSC) utilizing a carbon electrode is a potential candidate for industrially viable, low-cost and highly stable photovoltaics. Therefore, it is important to understand the interface between perovskite layer and carbon electrode to achieve the improved performance of PSCs. We demonstrate an improvised two-step perovskite MAPbI3(methylammonium lead iodide) deposition method, involving a pretreatment of PbI2on the porous structure of TiO2/ZrO2/Carbon, which led to the difference in performance. A PbI2passivation layer at the interface between carbon electrode and perovskite resulted in the improved power conversion efficiency (PCE) of 7.30% from 2.21% compared to a one-step perovskite deposition with no pretreatment of PbI2. This study further explores that an enhanced PCE of 6.55% can be achieved with one-step fabrication while keeping the same perovskite. A fascinating methodology, utilizing quartz crystal microbalance (QCM), which involves the adsorption of PbI2on the carbon surface, was employed to unravel this difference. QCM monitored adsorbed mass in real time and revealed that the mass of PbI2on carbon layer increased with the increase in concentration of PbI2in dimethylformamide (DMF). It was noticed that PbI2was still adsorbed on the carbon surface even after rinsing with DMF, suggesting strong bonding of PbI2with carbon. PbI2presence after rinsing was also verified by X-ray photoelectron spectroscopy (XPS), which indicates that part of the Pb-I reacts with the -OH on the carbon surface forming C-O-Pb linkages. Our study demonstrates that a carbon electrode passivated with PbI2could reduce carrier recombination and improve performance of PSCs.

    DOI: 10.1021/acssuschemeng.8b01550

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  • Magnesium-Doped MAPbI<inf>3</inf>Perovskite Layers for Enhanced Photovoltaic Performance in Humid Air Atmosphere 査読有り

    Yang F., Kamarudin M., Kapil G., Hirotani D., Zhang P., Ng C., Ma T., Hayase S.

    ACS Applied Materials and Interfaces   10 ( 29 )   24543 - 24548   2018年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 American Chemical Society. Despite the high efficiency of MAPbI3perovskite solar cells, the long term stability and degradation in humid atmosphere are issues that still needed to be addressed. In this work, magnesium iodide (MgI2) was first successfully used as a dopant into MAPbI3perovskite prepared in humid air atmosphere. Mg doping decreased the valence band level, which was determined from photoelectron yield spectroscopy. Compared to the pristine MAPbI3perovskite film, the 1.0% Mg-doped perovskite film showed increased crystal grain size and formation of pinhole-free perovskite film. Performance of the solar cell was increased from 14.2% of the doping-free solar cell to 17.8% of 1.0% Mg-doped device. Moreover, 90% of the original power conversion efficiency was still retained after storage in 30-40% relative humidity for 600 h.

    DOI: 10.1021/acsami.8b06619

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  • Enhanced Crystallization by Methanol Additive in Antisolvent for Achieving High-Quality MAPbI<inf>3</inf>Perovskite Films in Humid Atmosphere 査読有り

    Yang F., Kamarudin M., Zhang P., Kapil G., Ma T., Hayase S.

    ChemSusChem   11 ( 14 )   2348 - 2357   2018年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Perovskite solar cells have attracted considerable attention owing to their easy and low-cost solution manufacturing process with high power conversion efficiency. However, the fabrication process is usually performed inside a glovebox to avoid moisture, as organometallic halide perovskites are easily dissolved in water. In this study, we propose a one-step fabrication of high-quality MAPbI3perovskite films in around 50 % relative humidity (RH) humid ambient air by using diethyl ether as an antisolvent and methanol as an additive into this antisolvent. Because of the presence of methanol, the water molecules can be efficiently removed from the gaps of the perovskite precursors and the perovskite film formation can be slightly controlled, leading to pinhole-free and low roughness films. Concurrently, methanol can be used to tune the DMSO ratio in the intermediate perovskite phase to regulate perovskite formation. Planar solar cells fabricated by using this method exhibited the best efficiency of 16.4 % with a reduced current density–voltage hysteresis. This efficiency value is approximately 160 % higher than the devices fabrication by using only diethyl ether treatment. From the impedance measurement, it is also found that the recombination reaction is suppressed when the device is prepared with methanol additive in the antisolvent. This method presents a new path for controlling the growth and morphology of perovskite films in humid climates and laboratories with uncontrolled environments.

    DOI: 10.1002/cssc.201800625

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  • Minute quantities of hexagonal nanoplates PtFe alloy with facile operating conditions enhanced electrocatalytic activity and durability for oxygen reduction reaction 査読有り

    Wang N., Li Y., Guo Z., Li H., Hayase S., Ma T.

    Journal of Alloys and Compounds   752   23 - 31   2018年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Pt-based alloys have been explored as the most promising cathode catalyst for fuel cells due to their excellent electrocatalytic activity in oxygen reduction reaction (ORR). However, the long-term performance of Pt-based alloys is compromised owing to the de-alloying behavior under the corrosive circumstance. More importantly, the complicated synthesized methods have hindered their further practical application. In this report, a facile and effective operating conditions-assisted method has been developed to synthesize the stable hexagonal nanoplates PtFe alloy with a high electrocatalytic activity. In the three prepared PtM (M: Fe, Co, Ni) alloy samples, the PtFe alloy exhibits a superior catalytic activity, which improves by about 100 and 178 mV for half-wave potential in alkaline and acidic medium with the same Pt-loading amount, respectively. In addition, the PtFe alloy catalyst exhibits an electrochemical stability, compared to the conventional carbon-supported Pt catalysts. In view of the advantages of the facile operating preparation and the excellent electrocatalytic performance, we believe that the hexagonal nanoplates PtFe alloy holds great application as a promising electrocatalyst in polymer electrolyte membrane fuel cell (PEMFC).

    DOI: 10.1016/j.jallcom.2018.04.181

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  • First-principles study of electronic and optical properties of lead-free double perovskites Cs<inf>2</inf>NaBX<inf>6</inf>(B = Sb, Bi; X = Cl, Br, I) 査読有り

    Zhao S., Yamamoto K., Iikubo S., Hayase S., Ma T.

    Journal of Physics and Chemistry of Solids   117   117 - 121   2018年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Elsevier Ltd Organolead halide perovskite is regarded as the most promising light-harvesting material for next-generation solar cells; however, the intrinsic instability and toxicity of lead are still of great concern. Bismuth is ecofriendly and has electronic properties similar to those of lead, which has gradually attracted interest for optoelectronic applications. However, the valence state of bismuth is different from that of lead, eliminating the possibility of replacing lead by bismuth in organolead halide perovskites. To address this matter, one feasible strategy is to construct B-site double perovskites by the combination of Bi 3+ and B + in 1:1 ratio. In this work, lead-free halide double perovskites of the form Cs 2 NaBX 6 (B = Sb, Bi; X = Cl, Br, I) were investigated by first-principles calculations. The electronic properties, optical absorption coefficients, and thermodynamic stability of these compounds were investigated to ascertain their potential application in solar energy conversion. The results provide theoretical support for the exploration of lead-free perovskite materials in potential optoelectronic applications.

    DOI: 10.1016/j.jpcs.2018.02.032

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  • Dependence of Acetate-Based Antisolvents for High Humidity Fabrication of CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf>Perovskite Devices in Ambient Atmosphere 査読有り

    Yang F., Kapil G., Zhang P., Hu Z., Kamarudin M., Ma T., Hayase S.

    ACS Applied Materials and Interfaces   10 ( 19 )   16482 - 16489   2018年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 American Chemical Society. High-efficiency perovskite solar cells (PSCs) need to be fabricated in the nitrogen-filled glovebox by the atmosphere-controlled crystallization process. However, the use of the glovebox process is of great concern for mass level production of PSCs. In this work, notable efficient CH 3 NH 3 PbI 3 solar cells can be obtained in high humidity ambient atmosphere (60-70% relative humidity) by using acetate as the antisolvent, in which dependence of methyl, ethyl, propyl, and butyl acetate on the crystal growth mechanism is discussed. It is explored that acetate screens the sensitive perovskite intermediate phases from water molecules during perovskite film formation and annealing. It is revealed that relatively high vapor pressure and high water solubility of methyl acetate (MA) leads to the formation of highly dense and pinhole free perovskite films guiding to the best power conversion efficiency (PCE) of 16.3% with a reduced hysteresis. The devices prepared using MA showed remarkable shelf life stability of more than 80% for 360 h in ambient air condition, when compared to the devices fabricated using other antisolvents with low vapor pressure and low water solubility. Moreover, the PCE was still kept at 15.6% even though 2 vol % deionized water was added in the MA for preparing the perovskite layer.

    DOI: 10.1021/acsami.8b02554

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  • Incredible PCE enhancement induced by damaged perovskite layers: Deeply understanding the working principle of additives in bulk heterojunction perovskite solar cells 査読有り

    Gao L., Wang L., Ding X., Zhao E., Yang S., Zhao Y., Li Y., Wang S., Ma T.

    Journal of Materials Chemistry A   6 ( 10 )   4365 - 4373   2018年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Royal Society of Chemistry. The power conversion efficiency (PCE) of perovskite solar cells (PSCs) can be improved by introducing appropriate additives into perovskite precursor solutions. However, the exact role and mechanism of additives are still unclear. In this study, self-designed cognition experiments were conducted to improve the hole extraction efficiency, as well as to deeply understand the working principle of additives. A common hole transport material, 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl) amino]-9,9′-spirobifluorene (spiro-OMeTAD), was used as an additive for bulk heterojunction PSCs (BHJ-PSCs). The results showed that the PCE of mesoporous BHJ-PSCs (M-BHJ-PSCs) was enhanced by more than 15% when an extremely low concentration of spiro-OMeTAD additive was added. However, the crystallization of the perovskite was hampered and the recombination risk increased when grain boundaries increased in the perovskite layer. Planar BHJ-PSCs were fabricated to further investigate the role of additives. In comparison with those in planar BHJ-PSCs, the hole extraction efficiency and diffusion length significantly improved in M-BHJ-PSCs due to the transport paths and relay effects caused by the spiro-OMeTAD additive. Subsequently, exact functions and a new working principle of additives in BHJ-PSCs were proposed. This study may extend the possibilities of designing highly efficient PSCs through the promotion of additive research and application.

    DOI: 10.1039/c7ta09740a

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  • Methoxy-functionalized mesostructured stable carbon catalysts for effective biodiesel production from non-edible feedstock 査読有り

    Teo S., Islam A., Ng C., Mansir N., Ma T., Thomas Choong S., Taufiq-Yap Y.

    Chemical Engineering Journal   334   1851 - 1868   2018年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier B.V. The nano-architectured Ca(OCH 3 ) 2 /AC catalyst was prepared through hydrothermal process. In this work, the controlled structural growth and morphology of nano-architectured Ca(OCH 3 ) 2 /AC catalyst were reported and their conversion activity from non-edible oil source (crude jatropha oil) to biodiesel production was also evaluated in this study. Remarkable difference in catalytic activity for biodiesel production among these samples was observed. It shows that the catalytic properties of the hydrothermal synthesized catalyst was improved by exposing the catalytic active –OCH 3 predominantly on the surface of catalyst. The 0.4-OMe/AC catalyst with methanol/oil molar ratio of 12:1, agitation speed of 600 rpm and 3 wt% of catalyst provided maximum biodiesel yield of 98.65% at 60 °C for 1 h reaction time. The catalyst exhibited outstanding stability where negligible Ca 2+ leaching was detected and the recovered catalyst was reused in 8 successive cycles without significant loss in activity. Therefore, this kind of bimodal porosity catalyst is said to exhibit very high activity, stability, and recyclability, which entailed potential saving and affordable biodiesel production possibilities.

    DOI: 10.1016/j.cej.2017.11.110

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  • Low-Temperature Processed Non-TiO2 Electron Selective Layers for Perovskite Solar Cells

    Zhanglin Guo, Liguo Gao, Chu Zhang, Zhenhua Xu, and Tingli Ma

    Journal of Materials Chemistry A ( The Royal Society of Chemistry )   2018 ( 6 )   4572 - 4589   2018年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    DOI: 10.1039/C7TA10742K

    その他リンク: http://pubs.rsc.org/en/journals/journalissues/ta?_ga=2.245620483.687131330.1527469395-1565246849.1522665777#!recentarticles&adv

  • In-situ grown Ni(OH)<inf>2</inf>nanosheets on Ni foam for hybrid supercapacitors with high electrochemical performance 査読有り

    Guo J., Zhao Y., Jiang N., Liu A., Gao L., Li Y., Wang H., Ma T.

    Journal of the Electrochemical Society   165 ( 5 )   A882 - A890   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Electrochemical Society. In-suit grown composite materials have received much attention on scientific communities in recent years owing to their unique physicochemical properties for applications such as energy storage devices. Herein, we report freestanding in-situ grown Ni(OH)2 nanosheets on Ni foam by a facile one-step hydrothermal approach using aqueous nickel nitrate as precursor solution without any additives. The influence of concentration of nickel nitrate on morphology and electrochemical properties of the synthesized Ni(OH) 2 /Ni foam (NHNF) was investigated. Binder-free 0.12-NHNF electrode material exhibited a high gravimetric capacity of 340 mAh g −1 at a current density of 1 A g −1 , excellent cycling stability (81.1% capacity retention after 3000 cycles) and good flexibility (89.2% capacity retention after folding in a roll). A hybrid supercapacitor (HSC) based on the synthesized 0.12-NHNF as positive electrode and commercial active carbon as negative electrode delivered a high energy density of 39.2 Wh kg −1 at a power density of 598 W kg −1 at a working voltage of 1.6 V. Long-term cycling stability test shows that the capacity retention of 84.3% was achieved with the HSC after 3000 cycles. The excellent electrochemical performance of the NHNF material indicates that it can be an appealing candidate electrode material in energy storage devices.

    DOI: 10.1149/2.0411805jes

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  • Development of a novel mixed sulfide-iodide lead-free bismuth perovskite 査読有り

    Zhang C., Teo S., Gao L., Kamata Y., Ma T.

    Proceedings of SPIE - The International Society for Optical Engineering   10724   2018年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2018 SPIE. In recent years, lead-based perovskites have become the most promising photovoltaic material showing excellent photovoltaic performances. However, the lead-based perovskite encounters instability and toxicity issues caused by the generation of Pb2+, which is highly not beneficial to environment. In this study, we firstly reported the synthesis and characterization of a novel lead-free mixed chalcogen-halogen perovskite material, MABiI2S (MBIS), and determined its physical and optical properties by various testing methods. The MBIS possesses a low bandgap of 1.52 eV and exhibits good absorptions across the visible light spectrum. It is also worth noting that the MBIS displayed absorption up to over 1000 nm.

    DOI: 10.1117/12.2502721

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  • Design of a novel and highly stable lead-free Cs<inf>2</inf>NaBiI<inf>6</inf> double perovskite for photovoltaic application 査読有り

    Zhang C., Gao L., Teo S., Guo Z., Xu Z., Zhao S., Ma T.

    Sustainable Energy and Fuels   2 ( 11 )   2419 - 2428   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Royal Society of Chemistry. In recent years, lead-based perovskites have become the most promising photovoltaic materials, showing excellent photoelectronic performance. However, the lead-based perovskites also exhibit instability and significant environmental impact. In this study, we have first reported the synthesis and characterization of a new lead-free double perovskite material, Cs2NaBiI6 (CNBI), and determined its crystal structure and optical properties by various testing methods. CNBI has a low band gap of 1.66 eV and exhibits high stability against moisture and oxygen in ambient air. We have also inspected the crystal growth process of CNBI and elucidated its crystal growth mechanism. Solar cell devices fabricated with CNBI as the absorber layer have shown great stability and reproducibility.

    DOI: 10.1039/c8se00154e

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  • Effective oxygen reduction and evolution catalysts derived from metal organic frameworks by optimizing active sites 査読有り

    Li Y., Xu H., Huang H., Gao L., Ma T.

    Journal of the Electrochemical Society   165 ( 3 )   F158 - F165   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Electrochemical Society. Electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are core materials in many renewable energy technologies including fuel cells, metal-air batteries, and water splitting devices. However, the high cost of the catalysts such as platinum and iridium oxide severely hinders the commercial development of these devices. Herein, we report a simple method for synthesizing effective bifunctional oxygen reduction and oxygen evolution catalysts through the rationally design of bimetallic metal organic framework precursor. The ratio of Zn and Co was optimized to search the critical factors affecting the catalysis of the ORR and OER. We found that for ORR catalysis, both Co/Co 9 S 8 species and heteroatom-doped porous carbons played important roles. In contrast, the Co/Co 9 S 8 species play more important role in OER catalysis. The optimized catalyst NSC-1-5 showed excellent ORR performance, with an onset potential of 0.879 V and a half wave potential of 0.81 V, as well as good OER catalytic activity. This was achieved simply by controlling the ratio of Co and Zn in the precursor, and NSC-1-5 could serve as a bifunctional catalyst for both ORR and OER. This work could shed some light on the design of bifunctional catalyst for both ORR and OER.

    DOI: 10.1149/2.0771803je

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  • Interparticle coupling effect of silver-gold heterodimer to enhance light harvesting in ultrathin perovskite solar cell 査読有り

    Hu Z., Ma T., Hayase S.

    Journal of Photonics for Energy   8 ( 1 )   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). Thin perovskite solar cells are under intensive interest since they reduce the amount of absorber layer, especially toxic lead in methylammonium lead iodide (MAPbI 3 ) devices and have wide application in semitransparent and tandem solar cells. However, due to the decrease of the layer thickness, thin perovskite devices with weak light-harvesting have poor performance. Moreover, the performance of plasmonic thin perovskite devices by incorporating noncoupling metal NPs cannot give comparable performance with normal devices. In this perspective, we discuss the implication of employing random silver-gold heterodimers in MAPbI 3 solar cells with the aim of establishing some guidelines for the efficient ultrathin perovskite solar cells. This method induces an extraordinarily high light-harvesting for ultrathin perovskite film. And the underlying physical mechanism behind the enhanced absorption is deeply investigated by plasmon hybridization, dipolar-dipolar coupling method and FDTD simulation. We notice that perovskite embedded silver-gold heterodimer overcomes the vanished antibonding plasmon resononse in nonjunction area of gold/silver homodimer. A 150-nm perovskite film with embedded random silver-gold heterodimers with 80 nm size and 25 nm gap distance processes 28.15% absorption enhancement compared to the reference film, which is higher than the reported 10% for gold homodimers. And we also predict a realistic solution-processed, easy, and low-cost fabrication method, which provide a means to realize highly efficient ultrathin perovskite solar cell including other absorber-based photovoltaics.

    DOI: 10.1117/1.JPE.8.015502

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  • One-dimensional MoO <inf>2</inf> -Co <inf>2</inf> Mo <inf>3</inf> O <inf>8</inf> @C nanorods: A novel and highly efficient oxygen evolution reaction catalyst derived from metal-organic framework composites 査読有り

    Li Y., Xu H., Huang H., Wang C., Gao L., Ma T.

    Chemical Communications   54 ( 22 )   2739 - 2742   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Royal Society of Chemistry. One-dimensional MoO 2 -Co 2 Mo 3 O 8 @C nanorods were synthesized by using MoO 3 @ZIF-67 composites as a precursor for the first time, and it is found that the Co 2 Mo 3 O 8 species and its composite have excellent OER activities. The MoO 2 -Co 2 Mo 3 O 8 @C nanorods present favorable electrocatalytic advantages toward OER in alkaline solution, requiring an overpotential of only 320 mV to deliver a current density of 10 mA cm -2 . In addition, the catalyst also shows a small Tafel slope of 88 mV dec -1 and relatively good durability. The attractive OER performance can be attributed to the highly active Co 2 Mo 3 O 8 and MoO 2 species and the unique structure of the catalyst. This strategy can be extended to design and synthesize other novel and highly efficient molybdenum based ternary metal oxides as OER catalysts.

    DOI: 10.1039/c8cc00025e

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  • Synthesis of fe, co incorporated in p-doped porous carbon using a metal-organic framework (MOF) precursor as stable catalysts for oxygen reduction reaction 査読有り

    Wang N., Li Y., Guo Z., Li H., Hayase S., Ma T.

    Journal of the Electrochemical Society   165 ( 12 )   G3080 - G3086   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Author(s) 2018. Published by ECS. Heteroatom-doped porous carbon materials have recently attracted significant attention due to their superior catalytic activities for an oxygen reduction reaction (ORR). Transition metals co-doped with heteroatom are considered to have positive effects on improving ORR catalytic activity and stability. We report a series of novel Fe, Co incorporated in P-doped carbon materials, which give high ORR performance by an in-situ carbonization method. The ratios of the two metals and the carbonization temperatures are the key factors for the electrocatalytic activity. Due to the synergistic effect of the two transition metals, the Fe, Co incorporated in P-doped porous carbon sample, carbonized at 900ºC, shows the highest catalytic activity and stability. Electrochemical measurements show that Fe, Co incorporated in P-doped porous carbon materials are promising electrocatalysts to substitute Pt-based catalysts for fuel cells application.

    DOI: 10.1149/2.0131812jes

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  • Synthesis of Co-B in porous carbon using a metal-organic framework (MOF) precursor: A highly efficient catalyst for the oxygen evolution reaction 査読有り

    Li, Y., Xu, H., Huang, H.,Gao,L., Zhao, Y., Ma, T.

    Electrochemistry Communications   86   140 - 144   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.elecom.2017.12.011

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  • Facile synthesis of N, S co-doped porous carbons from a dual-ligand metal organic framework for high performance oxygen reduction reaction catalysts 査読有り

    Li Y., Xu H., Huang H., Gao L., Zhao Y., Ma T.

    Electrochimica Acta   254   148 - 154   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier Ltd Heteroatom doped porous carbons have been regarded as one of most promising candidates for Pt-free oxygen reduction reaction (ORR) catalysts. The proper heteroatom bonding configuration and synergistic effect of multiple atom co-doping are very important for improving their cata lytic activity. In this work, a series of N, S co-doped porous carbons (NSCs) with excellent ORR performance were prepared by rationally using a dual-ligand metal organic framework as a carbon precursor. The interconnected porous structure, high surface area, N, S co-doping and high graphitization-N dopant, significantly contribute to the enhanced catalytic performance of ORR. The electrocatalyst studies indicated that the obtained materials have comparable ORR activity to that of the commercial Pt/C in both alkaline and acidic media, and superior long-term durability than that of Pt/C. This work can provide some guidance for synthesizing other multiple atom co-doping carbons for energy storage and conversion applications through target oriented synthesis of metal organic frameworks with different ligands.

    DOI: 10.1016/j.electacta.2017.09.143

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  • Light engineering for bifacial transparent perovskite solar cells with high performance 査読有り

    Gao L., Zhao E., Yang S., Wang L., Li Y., Zhao Y., Ma T.

    Optical Engineering   56 ( 11 )   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE). Bifacial transparent perovskite solar cells (BTPSCs) were designed to harvest more solar energy and ensure higher efficiency than conventional PSCs. A series of BTPSCs was successfully prepared using transparent ultrathin Au electrodes with different thicknesses. The transmittance and resistance of Au electrodes played a major role in achieving photo-to-electricity conversion efficiency (PCE). Engineering the light-harvesting ability of the fabricated BTPSCs led to the highest PCE of 14.74%. Reflecting-light intensity and illumination angle were further observed to be the key factors affecting PCE. These BTPSCs could be applied on building integration of photovoltaics (PVs), such as semitransparent PV windows or venetian blinds. Another alternative application is to use these BTPSCs as the wings of unmanned aerial vehicles.

    DOI: 10.1117/1.OE.56.11.117107

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  • All-solid-state flexible asymmetric supercapacitors with high energy and power densities based on NiCo<inf>2</inf>S<inf>4</inf>@MnS and active carbon 査読有り

    Zhang Z., Huang X., Li H., Wang H., Zhao Y., Ma T.

    Journal of Energy Chemistry   26 ( 6 )   1260 - 1266   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier Ltd Electrode material based on a novel core–shell structure consisting of NiCo 2 S 4 (NCS) solid fiber core and MnS (MS) sheet shell (NCS@MS) in situ grown on carbon cloth (CC) has been successfully prepared by a simple sulfurization-assisted hydrothermal method for high performance supercapacitor. The synthesized NiCo 2 S 4 @MnS/CC electrode shows high capacitance of 1908.3 F g −1 at a current density of 0.5 A g −1 which is higher than those of NiCo 2 S 4 and MnS at the same current density. A flexible all-solid-state asymmetric supercapacitor (ASC) is constructed by using NiCo 2 S 4 @MnS/CC as positive electrode, active carbon/CC as negative electrode and KOH/poly (vinyl alcohol) (PVA) as electrolyte. The optimized ASC shows a maximum energy density of 23.3 Wh kg −1 at 1 A g −1 , a maximum power density of about 7.5 kw kg −1 at 10 A g −1 and remarkable cycling stability. After 9000 cycles, the ASC still exhibited 67.8% retention rate and largely unchanged charge/discharge curves. The excellent electrochemical properties are resulted from the novel core–shell structure of the NiCo 2 S 4 @MnS/CC electrode, which possesses both high surface area for Faraday redox reaction and superior kinetics of charge transport. The NiCo 2 S 4 @MnS/CC electrode shows a promising potential for energy storage applications in the future.

    DOI: 10.1016/j.jechem.2017.09.025

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  • Photocatalytic activity enhanced by 1D TiO<inf>2</inf>nanobelts and 2D BiVO<inf>4</inf>nanosheets Heterostructures 招待有り 査読有り

    Gao L., Du J., Ma T.

    Micro and Nano Letters   12 ( 9 )   580 - 584   2017年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Institution of Engineering and Technology 2017. Heterostructures that are formed by incorporating one-dimensional (1D) titanium dioxide (TiO 2 ) nanobelts into 2D bismuth vanadate (BiVO 4 ) nanosheets are fabricated via an electrostatic self-assembly process. The key features are investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller, zeta potential, ultraviolet-visible (vis) diffuse reflection spectra and photoluminescence spectra. As vis-light sensitiser and catalyst support, 2D BiVO 4 nanosheets can improve the vis-light photocatalytic activity of 1D TiO 2 nanobelts. Results show that 1D TiO 2 nanobelt-2D BiVO 4 nanosheet composites exhibit more efficient decomposition rate of rhodamine B compared with pure TiO 2 nanobelts. The photocatalytic activity of TiO 2 -5% BiVO 4 composites is nearly 1.7 times higher than that of pure TiO 2 nanobelts. The enhanced photocatalytic performance is attributed to the bandgap match and the formation of heterostructures between TiO 2 nanobelts and BiVO 4 nanosheets. The heterostructures extend the light responsive range and promote efficient separation of photoinduced electron-hole pairs.

    DOI: 10.1049/mnl.2016.0773

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  • Cysteine-assisted synthesis of CuS-TiO<inf>2</inf>composites with enhanced photocatalytic activity 査読有り

    Gao L., Du J., Ma T.

    Ceramics International   43 ( 12 )   9559 - 9563   2017年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier Ltd and Techna Group S.r.l. CuS-TiO 2 composites are in situ synthesized via an environmentally friendly route using biomolecule L-cysteine as a sulfur source and chelating agent. The prepared samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS). Results indicate that CuS nanoparticles are successfully loaded on TiO 2 nanobelts. The photocatalytic activity of CuS-TiO 2 composites is more than twice of that of pure TiO 2 nanobelts under visible-light irradiation. The enhanced photocatalytic activity can be ascribed to energy band match and the formed heterostructures between CuS and TiO 2 , which lead to the efficient separation of photogenerated electrons and holes. The synthesized CuS-TiO 2 composites by methods of cysteine-assist exhibit superior stability.

    DOI: 10.1016/j.ceramint.2017.04.093

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  • Discontinuous SnO<inf>2</inf> derived blended-interfacial-layer in mesoscopic perovskite solar cells: Minimizing electron transfer resistance and improving stability 査読有り

    Dong Q., Dong Q., Wang M., Zhang Q., Chen F., Zhang S., Bian J., Ma T., Wang L., Shi Y.

    Nano Energy   38   358 - 367   2017年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017Based on a blended-interfacial-layer (BIL) with strongly coupled four components (FTO, SnO2, TiO2 and perovskite), we demonstrate in this work the design of a more advanced electron transfer layer (ETL) for mesoscopic PSCs. For the new ETL, SnO2 is a key component and is found to be essential to lower series resistance and enhance shunt resistance. Photovoltaic performance of PSCs using new ETL is much better than that of PSCs based on traditional ETL. In addition, the new ETL has been proved to be more advantageous in avoiding interfacial degradation and improving stability of the device.

    DOI: 10.1016/j.nanoen.2017.05.058

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  • Insights on Catalytic Activities of Transition Metal Selenides as Efficient Counter Electrode Materials for Dye-sensitized Solar Cells 査読有り

    Guo J., Shi Y., Ma T.

    Rengong Jingti Xuebao/Journal of Synthetic Crystals   46 ( 8 )   1503 - 1510   2017年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017, Chinese Ceramic Society. All right reserved. Exploiting an alternative of the Pt-based counter electrode (CE) materials for triiodide reduction reaction has become a major interest in the fundamental research of dye-sensitized solar cells (DSCs). Transition-metal selenides (TMSes) was proved a promising non-precious metal electrocatalysts and be used as counter electrode in DSCs. However, the research on TMSes as counter electrode material in DSCs is not enough in-depth and lack systematic research. Two TMSes, Cr5.6Se8 and HfSe3 were prepared by a free-reductant solvothermal method and used them as counter electrodes in high efficiency DSCs. The electrochemical results show that these selenides have excellent catalytic activity for the reduction of triiodine/iodine couple, the conversion efficiencies of corresponding DSCs are 7.27% for Cr5.6Se8 and 7.52% for HfSe3, respectively, comparable to DSCs based on sputtered Pt CE. These results further prove the possibility of selenides as a potential CE materials, and provided a basic research for new selenides.

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  • In Situ Fabrication of Nanoepitaxial TiO<inf>2</inf> Protection Layer on Si Substrate: Hole Chemical Conduction Instead of Tunneling Effect 査読有り

    Gao L., Li Q., Chen H., Hayase S., Ma T.

    Solar RRL   1 ( 8 )   2017年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The efficiency of the Si photoanode of photoelectrochemical (PEC) cells in solar water splitting undergoes poor charge separation and transfer process through multiple interfaces. This phenomenon occurs mainly due to a recombination induced by interfacial defects and quantum tunneling effect caused by SiO2 layer insulation. In this study, the in situ fabrication of nanoepitaxial TiO2 on Si substrates in constructing TiO2/Si heterojunction is performed by combining a self-assembly process and a hydrothermal method. The nanoepitaxial growth process is conducted because of the crystal type and lattice matching between anatase-type TiO2 and Si substrate. Studies have shown that a minimal insulator SiO2 layer is left in the heterogeneous interface, which is contacted by a chemical bond. Therefore, a nearly defect-free heterojunction without a SiO2 insulator layer is obtained. After depositing the common catalyst Ni, a large saturated current density of Ni/TiO2/Si photoanode is achieved. This excellent property is caused by fast carrier transfer through the heterogeneous interface, resulting in the efficiency of injection and separation of fast carriers. In comparison with the traditional method, (i.e., the TiO2 protection film deposited by atom layer deposition (ALD)), the Ni/TiO2/Si photoanode fabricated by nanoepitaxial growth has a significantly lower onset potential and remarkably higher current density, which is 11-fold at 1.23 V bias potential. Results confirm that the nanoepitaxy of TiO2 on Si can improve the stability of Si substrates in an alkaline solution for more than 24 h.

    DOI: 10.1002/solr.201700064

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  • Metal-organic framework derived hierarchical porous TiO2 nanopills as a super stable anode for Na-ion batteries 査読有り

    Li H., Zhang Z., Huang X., Lan T., Wei M., Ma T.

    Journal of Energy Chemistry   26 ( 4 )   667 - 672   2017年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.jechem.2017.02.008

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  • Low-temperature processed compact layer for perovskite solar cells with negligible hysteresis 査読有り

    Wang L., Liu F., Liu F., Liu T., Cai X., Wang G., Ma T., Ma T., Jiang C.

    Electrochimica Acta   235   640 - 645   2017年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier LtdHybrid organic/inorganic perovskite solar cells (PVSCs) are promising alternatives to traditional photovoltaic devices because of their low cost, high power conversion efficiency, and simple production process. Therefore, achieving a low-temperature and high-efficiency procedure is necessary to realize the large-scale production of PVSCs. This study developed a facile low-temperature process (70 °C) for the synthesis of anatase TiO2 thin films on the FTO substrate through an in situ growth method. The as-synthesized anatase TiO2 thin films were applied on efficient compact layers of all low-temperature (sub-100 °C)-processed PVSCs. Under optimization, the achieved low-temperature PVSC device exhibited a champion conversion efficiency of up to 10.33%, with excellent repeatability and negligible hysteresis. Results revealed that fast electron extraction and transfer between perovskite and TiO2 films and effective suppression of charge recombination are the main attributes for the excellent performance of the PVSC device. This work provides a new alternative to achieve low-temperature and high-efficiency photovoltaic devices.

    DOI: 10.1016/j.electacta.2017.03.145

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  • 3-D honeycomb NiCo<inf>2</inf>S<inf>4</inf>with high electrochemical performance used for supercapacitor electrodes 査読有り

    Zhang Z., Huang X., Li H., Zhao Y., Ma T.

    Applied Surface Science   400   238 - 244   2017年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016 Elsevier B.V. A new nanostructured 3-D honeycomb NiCo 2 S 4 (NC-1) has been successfully prepared by a simple hydrothermal method assisted sulfuration procedure. The morphology of the 3-D honeycomb was investigated by FESEM and TEM, and the results suggest the NC-1 has a highly porous structure. Its chemical composition was characterized by XRD and XPS and the results indicate that the NC-1 is the pure phase of NiCo 2 S 4 . In order to study the effect of morphology on the electrochemical performance, we have also prepared needle-, flake- and petal-like nanostructured NiCo 2 S 4 on Ni foam. When they were used as supercapacitor electrodes, the NC-1 exhibited the highest electrochemical performance among these four kinds of electrodes. Its maximum specific capacity was over 14 mAh cm −2 at 1 mA m −2 and it still yielded 7.96 mAh cm −2 even at 50 mA cm −2 . The NC-1 remained 99.64% of the initial capacity after the long-term test of 1000 cycles. Consequently, the NC-1 has the promising potential as an energy storage system in the future and it can also be used as an ideal substrate for other active materials involving a faradaic process.

    DOI: 10.1016/j.apsusc.2016.12.206

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  • Transparent Conductive Oxide Layer and Hole Selective Layer Free Back-Contacted Hybrid Perovskite Solar Cell 査読有り

    Hu Z., Kapil G., Shimazaki H., Pandey S., Ma T., Hayase S.

    Journal of Physical Chemistry C   121 ( 8 )   4214 - 4219   2017年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 American Chemical Society.Back-contacted architectures have been under intensive investigation for that transparent conductive oxide (TCO) less solar cells (SCs) can be easily realized which avoid the transmission loss of light caused by TCO, typically comprised in conventional solar cells. Here, network-like porous Ti was first utilized as the back-contacted electrode, and a new design allows for a novel back-contacted hybrid perovskite SC without TCO and hole selective layer, which shows a power output of 3.88% with long-term stability. In addition, it avoids limit available collection area of electrodes in the recent reported interdigitated electrode (IDE) based back-contacted TCO-less SCs. (Graph Presented).

    DOI: 10.1021/acs.jpcc.7b00760

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  • Advances and Obstacles on Perovskite Solar Cell Research from Material Properties to Photovoltaic Function

    Bisquert J., Qi Y., Ma T., Yan Y.

    ACS Energy Letters ( ACS Energy Letters )   2 ( 2 )   520 - 523   2017年02月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    DOI: 10.1021/acsenergylett.7b00085

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  • One-Stage Method for Fabricating Superhydrophobic Stainless Steel Surface and Its Anti-Corrosion Performance 査読有り

    Gao L., Yang S., Yang H., Ma T.

    Advanced Engineering Materials   19 ( 2 )   2017年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim One-stage preparation of superhydrophobic stainless steel surface is achieved by combining chemical etching and assembly. The contact angle of the prepared surface reaches as high as 175°. The correlative mechanism between the contact angle and surface morphology is elucidated from the dynamics perspective by controlling reaction conditions. The optimum reaction conditions are then determined. Experimental results demonstrate that the stainless steel surface achieves optimal water contact angle upon the formation of the “honeycomb” 3D network structure. Electrochemical corrosion test shows that the prepared superhydrophobic stainless steel surface possesses 16 times higher corrosion resistance than common stainless steel surface.

    DOI: 10.1002/adem.201600511

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  • A novel composite of W<inf>18</inf>O<inf>49</inf> nanorods on reduced graphene oxide sheets based on in situ synthesis and catalytic performance for oxygen reduction reaction 査読有り

    Guo J., Guo J., Shi Y., Zhou H., Wang X., Ma T., Ma T.

    RSC Advances   7 ( 4 )   2051 - 2057   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry.A novel composite catalyst based on in situ synthesis of W1+49 nanorods on reduced graphene oxide sheets was successfully fabricated through a one-pot solvothermal route. The as-prepared W18O49-reduced graphene oxide (rGO) composite has been systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman microscopy, X-ray photoelectron spectra, and a rotating disk electrode. Compared to W18O49 nanorods or reduced graphene oxide alone, or their physical mixture, the composite catalyst exhibited unexpectedly high ORR activity with a more positive onset-potential (close to that of Pt/C) and a higher kinetic current density (JK), which is mainly attributed to the nanorod morphology, surface oxygen vacancies of W18O49, and strong coupling interaction between the W18O49 nanorods and reduced graphene oxide sheets. These results raise the possibility of developing low-cost and efficient ORR electrocatalysts.

    DOI: 10.1039/c6ra27031j

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  • Transparent conductive oxide-less back contact dye-sensitized solar cells using flat titanium sheet with microholes for photoanode fabrication 査読有り

    Hayat A., Hayat A., Baranwal A., Nakamura M., Shigeki F., Pandey S., Ma T., Hayase S.

    Journal of Photonics for Energy   7 ( 1 )   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).A flat titanium sheet with microholes (FTS-MH) has been utilized to fabricate transparent conductive oxide-less dye-sensitized solar cells (TCO-less DSSCs) in back contact device architecture. Utilization of FTS-MH to fabricate a TCO-less photoanode offers several advantages in terms of simplicity and ease of fabrication as compared with the TCO-less DSSCs structure reported previously. Hydrogen peroxide (H2O2) surface treatments on FTS-MH have shown important factors to enhance the photoanode properties. H2O2 surface treatment is able to change the surface morphology of FTS-MH, and the created anatase titanium dioxide (TiO2) nanostructures increase the surface contact between the FTS-MH and the coated mesoporous TiO2. Electrochemical impedance investigations reveled that improvements of the FTS-MH/TiO2 and TiO2/dye/electrolyte interface led to hampered charge recombination resulting in enhancement of both short-circuit current density and open-circuit voltage, respectively. Even after removal of both TCO layers, our complete TCO-less DSSCs exhibited a power conversion efficiency of 7.25% under simulated solar irradiation.

    DOI: 10.1117/1.JPE.7.015501

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  • W(Nb)O<inf>x</inf>-based efficient flexible perovskite solar cells: From material optimization to working principle 査読有り

    Wang K., Shi Y., Gao L., Chi R., Shi K., Guo B., Zhao L., Ma T., Ma T.

    Nano Energy   31   424 - 431   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016Flexible perovskite solar cell (PSC) using plastic substrate is one of the most focal points in the studies of thin-film solar cells. Low-temperature preparation of suitable electron selective layer (ESL) is the key issue in the fabrication of flexible PSCs. In this work, amorphous niobium-modified tungsten oxide W(Nb)Ox was prepared as ESL for efficient flexible PSC. Modification using Nb5+ improved the electron transport of WOx-based ESL by enhancing donor density, reducing interfacial depletion width, and minimizing trap states in the ESL. Consequently, photovoltaic performance of the simple planar flexible PSCs was improved, and high PCEs of 15.65% and 13.14% were obtained when ESLs were fabricated at 120 °C and room temperature, respectively. In addition, the effect of ESL thickness on the hysteresis behavior of PSCs was carefully analyzed. A capacitance CE across the ESL in the ITO/ESL/perovskite structure was proposed. This capacitance could well indicate the effect of ESL thickness on hysteresis behavior. The proposed modification strategy and mechanism is expected to facilitate the development of novel and advanced functional materials.

    DOI: 10.1016/j.nanoen.2016.11.054

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  • Transparent conductive oxide-less dye-sensitized solar cells consisting of dye-cocktail and cobalt based redox electrolyte 査読有り

    Molla M., Baranwal A., Pandey S., Ma T., Hayase S.

    Journal of Nanoscience and Nanotechnology   17 ( 7 )   4748 - 4754   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2017 American Scientific Publishers. All rights reserved.Thin Ti-metal protected stainless steel metal mesh coated with mesoporous TiO2 as flexible photoanode has been used to fabricate back contact transparent conductive oxide-less dye-sensitized solar cells. TiO2 nanoparticle having a particle size of 15-20 nm sensitized with dye cocktail of two indoline dyes D-205 and D-131 were first utilized owing to their complementary light harvesting properties. Short-circuit photocurrent density (Jsc) for the dye cocktail combination of D-205 and D-131 (1:1) was found to be increased due to the increased photon harvesting in the 400-500 nm mainly associated with the contribution from D-131 dye. In addition, the electron recombination was suppressed when dye cocktail was employed as confirmed by the dark current measurement leading to higher open-circuit voltage (Voc). The enhanced Jsc accompanied with increased Voc resulted in to an improved efficiency of 3.59% for this cocktail combination. To enhance the efficiency even further, we have utilized TiO2 nanoparticle having a larger particle size of 30 nm facilitating the mass transport of the bulky [Co(bpy)3]3+/2+ redox species. In order to enhance the photon harvesting window TiO2 nanoparticles were sensitized with porphyrin dye (YD2-o-C8) along with different dye cocktail combinations with another complementary dye (Y123). Utilization of a dye cocktail of YD2-o-C8 and Y123 (4:1) led to improved photoconversion efficiency of 5.25% under simulated solar irradiation.

    DOI: 10.1166/jnn.2017.13746

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  • In situ fabrication of integrated electrode of perovskite solar cells 査読有り

    Gao L., Yang S., Li Y., Zhao E., Wang L., Fu C., Hayase S., Ma T.

    Chemistry Letters   46 ( 11 )   1687 - 1690   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 The Chemical Society of Japan. An integrated electrode has been in situ fabricated on a titanium substrate by a simple thermal oxidation method. The integrated electrodes can replace glass substrates, fluorine-doped tin oxide (FTO), and TiO 2 compact and mesoporous layers in conventional perovskite solar cells (PSCs) with bilayer configuration. Under AM1.5 illumination, photon-to-electricity conversion efficiency (PCE) of the fabricated PSCs is 9.92%, which is higher than that of PSCs with bilayer configuration. Interestingly, photoluminescence (PL) measurements show a lower charge recombination in the integrated electrodes than normal TiO 2 electrodes fabricated layer by layer, thereby suggesting that photoinduced electrons in integrated electrodes can be more efficiently extracted. We also found that our PSCs have high conductivity and excellent stability. Therefore, the developed technique is suitable for fabricating large area PSCs.

    DOI: 10.1246/cl.170804

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  • Current advancements in material research and techniques focusing on lead-free perovskite solar cells

    Zhang C., Gao L., Hayase S., Ma T.

    Chemistry Letters ( Chemistry Letters )   46 ( 9 )   1276 - 1284   2017年01月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    © 2017 The Chemical Society of Japan. Organicinorganic lead halide perovskite solar cells (PSCs) recently achieved a photo-to-electricity conversion efficiency (PCE) of 22.1%. They drew much attention as promising photovoltaic devices. However, the Pb-based PSCs face great challenges for commercial and industrial applications due to the instability and the toxicity of perovskite materials. Herein, we summarize the current development of various types of Pb-free perovskites, such as the Sn-, Bi-, Ge-, Sr-, and Cu-based perovskites and their devices. In addition, we will address some remaining issues and prospects of the Pb-free PSCs.

    DOI: 10.1246/cl.170345

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  • Effect of lead-free (CH<inf>3</inf>NH<inf>3</inf>)<inf>3</inf>Bi<inf>2</inf>I<inf>9</inf>perovskite addition on spectrum absorption and enhanced photovoltaic performance of bismuth triiodide solar cells 査読有り

    Lan C., Luo J., Zhao S., Zhang C., Liu W., Hayase S., Ma T.

    Journal of Alloys and Compounds   701   834 - 840   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    � 2017 Elsevier B.V. Active composite layers of bismuth triiodide (BiI 3 ) and lead-free (CH 3 NH 3 ) 3 Bi 2 I 9 (MBI) perovskite were prepared using a simple chemical solution method under ambient conditions for thin-film solar cells. Results of X-ray diffraction and scanning electron microscopy indicated that the crystallization and surface morphologies of the composite films varied with perovskite contents. Multi-absorption was observed in the composite films due to the bandgap difference between BiI 3 and MBI perovskite. Moreover, band bending at the BiI 3 -perovskite interfaces resulted in the realignment of energy levels in the composite films, and this phenomenon was beneficial to the efficient injection of excited electrons from the active layers into the TiO 2 layers. Accordingly, due to the optimized crystallization and realigned energy level, when 20% of MBI perovskite was introduced into the active layers, the open-circuit voltage obviously increased from 0.44 V to 0.57 V in the (BiI 3 ) 0.8 (MBI) 0.2 composites solar cells, enhancing their power conversion efficiency by 67% compared with that in pure BiI 3 solar cell. This study developed a new route for designing more efficient lead-free solar cells.

    DOI: 10.1016/j.jallcom.2017.01.169

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  • Novel fabrication of Ni<inf>3</inf>S<inf>2</inf>/MnS composite as high performance supercapacitor electrode 査読有り

    Huang X., Zhang Z., Li H., Zhao Y., Wang H., Ma T.

    Journal of Alloys and Compounds   722   662 - 668   2017年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 A Ni 3 S 2 /MnS composite with unique 3-D morphology was synthesized by a novel method consisting of etching and pre-oxidation of Ni foam followed by in situ hydrothermal method. The etching process created a flower-like structure with the Ni foam which was not only used as a substrate but also providing Ni source for subsequent growth of Ni 3 S 2 and Ni 3 S 2 /MnS composite. The synthesized material showed hierarchical structure consisting of porous Ni 3 S 2 which was coated with vertically grown MnS nanorods. The superior morphology enables the access of more active sites in the electrochemical charge/discharge process. In the meantime, the charges involved in redox reaction can be effectively transferred via Ni 3 S 2 with relatively high conductivity to Nickel foam substrate, which improved the availability of MnS. Therefore, when the Ni 3 S 2 /MnS composite was used as a supercapacitor electrode, it showed a remarkable electrochemical performance of 6.70 mAh cm −2 which is over two-fold higher than that of the Ni 3 S 2 (3.15 mAh cm −2 ) and MnS (2.34 mAh cm −2 ) at current density of 2 mA cm −2 , respectively. Impressively, the specific capacity of Ni 3 S 2 /MnS still retained 6.41 mAh cm −2 with the capacity retention of 96.5% even after 1000 cycles. Further, the electrochemical properties of asymmetric supercapacitors (ACSs) deliver a maximum energy density of 0.47 mWh cm −2 at power density of 10 mW cm −2 , together with 82.1% retention after long-term test.

    DOI: 10.1016/j.jallcom.2017.06.166

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  • Pinhole-Free Perovskite Films by Methylamine Iodide Solution-Assisted Repair for High-Efficiency Photovoltaics under Ambient Conditions 査読有り

    Wang L., Liu F., Liu F., Liu T., Wang J., Cai X., Wang G., Ma T., Ma T., Jiang C.

    ACS Applied Materials and Interfaces   8 ( 45 )   30920 - 30925   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016 American Chemical Society.In this study, we demonstrate a simple strategy for obtaining pinhole-free, homogeneous, well-crystallized perovskite films under ambient conditions. The preparation of perovskite film with high light-harvesting efficiency and long carrier lifetime is verified. By applying this film in TiO2-based perovskite solar cells (PVSCs), we achieved a high power-conversion efficiency (PCE) of 13.07%, which is doubled with respect to that of the PVSC not subjected to the same improvement procedure (6.54%). High open-circuit photovoltage, photocurrent density, and fill factor are the main contributions to the high PCE that results from low trap density and high recombination resistance of the resultant perovskite films. This work paves a new means for fabricating high-performance perovskite films and PVSC devices in an ambient atmosphere.

    DOI: 10.1021/acsami.6b09978

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  • Concentration gradient controlled growth of large-grain CH3NH3PbI3 films and enhanced photovoltaic performance of solar cells in ambient conditions. 査読有り

    Chunfeng Lan, Shuai Zhao, Chu Zhang, Weiguo Liu, Shuzi Hayase, Tingli Ma

    CrystEngComm   18 ( 48 )   9243 - 9251   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c6ce02151d

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  • Facile synthesis and characterization of sulfur doped low bandgap bismuth based perovskites by soluble precursor route 査読有り

    Vigneshwaran M., Ohta T., Iikubo S., Kapil G., Ripolles T., Ogomi Y., Ma T., Pandey S., Shen Q., Toyoda T., Yoshino K., Minemoto T., Hayase S.

    Chemistry of Materials   28 ( 18 )   6436 - 6440   2016年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016 American Chemical Society.The bismuth based perovskite with the structure (CH3NH3)3Bi2I9 (MBI) is rapidly emerging as eco-friendly and stable semiconducting material as a substitute for the lead halide perovskites. A relatively higher bandgap of MBI (about 2.1 eV) has been found to be a bottleneck in realizing the high photovoltaic performance similar to that of lead halide based perovskites. We demonstrate the bandgap engineering of novel bismuth based perovskites obtained by in situ sulfur doping of MBI via the thermal decomposition of Bi(xt)3 (xt = ethyl xanthate) precursor. Colors of the obtained films clearly changed from orange to black when annealed from 80 to 120 °C. Formation of sulfur doped MA3Bi2I9 was confirmed by XRD and the presence of sulfur was confirmed through XPS. In this work, obtained sulfur doped bismuth perovskites exhibited a bandgap of 1.45 eV which is even lower than that of most commonly used lead halide perovskites. Hall-Effect measurements showed that the carrier concentration and mobility are much higher as compared to that of undoped MA3Bi2I9.

    DOI: 10.1021/acs.chemmater.6b02315

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  • Strategic improvement of the long-term stability of perovskite materials and perovskite solar cells

    Tingting Xu, Lixin Chen, Zhanhu Guo, and Tingli Ma

    Physical Chemistry Chemical Physics ( Physical Chemistry Chemical Physics )   18   27026 - 27050   2016年09月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

    DOI: 10.1039/C6CP04553G

  • Strategic improvement of the long-term stability of perovskite materials and perovskite solar cells 査読有り

    Tingting Xu, Lixin Chen, Zhanhu Guo, Tingli Ma

    Physical Chemistry Chemical Physics   39 ( 18 )   27026 - 27050   2016年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c6cp04553g

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  • A new D-D-π-A dye for efficient dye-sensitized solar cells 査読有り

    Yu X., Jiang H., Wang Y., Shi Y., Ma T., Bao M.

    Journal of Energy Chemistry   25 ( 5 )   769 - 774   2016年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.jechem.2016.05.005

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  • Recent progress of silicon composites as anode materials for secondary batteries 査読有り

    Jingjing Wang, Tingting Xu, Xiao Huang, Huan Lia, Tingli Ma

    RSC Advances   6   87778 - 87790   2016年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c6ra08971b

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  • Recent progress of silicon composites as anode materials for secondary batteries

    Jingjing Wang, Tingting Xu, Xiao Huang, Huan Li, and Tingli Ma

    RSC Advances ( RSC Advances )   2016年08月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)

  • Double perovskite material as an electrode for intermediate-temperature solid oxide fuel cells application 査読有り

    Zhang W., Zhang Z., Gao L., Ma T., Ma T.

    Progress in Chemistry   28 ( 6 )   961 - 974   2016年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016, Editorial Office of Progress in Chemistry. All right reserved.Solid oxide fuel cells (SOFCs) have attracted considerable attention because of their high energy conversion efficiency (reach up to 80%), low emission of pollutants, and excellent fuel flexibility. Conventional SOFCs need to be operated at high temperature typically at ~1000 ℃ to obtain the required performance. This high operating temperature leads to the degradation of fuel cell performance, interfacial reactions among the components, and limited choice of materials. Therefore, intermediate temperature solid oxide fuel cell (IT-SOFCs) would be a development trend for the next generation of SOFCs which could be commercialized in the future. Lowing the operating temperature from traditional 1000 ℃ to 500~800 ℃ or even lower not only significantly prolongs the lifetime of materials and reduces the SOFCs system costs, but also provides a broader range for material selection. Therefore, it is necessary to develop a new electrode material with high electrochemical activity in intermediate temperature range to improve electrochemical performance. As one of the mixed ionic-electronic conductors (MIECs), the reaction sites of double perovskite materials extend the active sites from the three phase boundary to the entire exposed surface, which affords low polarization resistance and high performance at intermediate operating temperature. Meanwhile, due to the high ability of transporting oxygen ions, the low thermal expansion coefficient, good catalytic activity and high tolerance to sulfur poisoning and strong resistance against carbon deposition, the double-perovskite oxide becomes a promising electrode material for the IT-SOFCs. This review focuses on the structure stability, electronic and ionic conductivity as well as catalytic activity of perovskite materials. The main concerns about current double perovskite based electrode materials are summarized and the main future research directions are proposed.

    DOI: 10.7536/PC150706

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  • Enhanced photoactivities of TiO<inf>2</inf> particles induced by bio-inspired micro-nanoscale substrate 査読有り

    Gao L., Wang Y., Yan Y., Li Q., Hao C., Ma T.

    Journal of Colloid and Interface Science   470   10 - 13   2016年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2016 Elsevier Inc.A silicon substrate with bio-inspired micro-nanoscale structure has been fabricated by wet etching, which is used as TiO2 particles supporting substrate and makes them recovery more easily. It has been shown that the structure facilitates TiO2 with large surface area and suppresses light reflection more effectively, which results in a high photocatalytic performance. The photocatalytic and stable performance has been applied on degrading methyl orange (MO).

    DOI: 10.1016/j.jcis.2016.02.029

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  • Tandem Dye-Sensitized Solar Cells Based on TCO-less Back Contact Bottom Electrodes 査読有り

    Baranwal A., Fujikawa N., Nishimura T., Ogomi Y., Pandey S., Ma T., Hayase S.

    Journal of Physics: Conference Series   704 ( 1 )   2016年04月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Mechanically stacked and series connected tandem dye sensitized solar cells (T-DSSCs) are fabricated in novel architectures. The architecture consist of TCO tandem DSSCs stacked with TCO-less back contact DSSCs as bottom electrodes (TCO-less tandem DSSCs). Resulting TCO-less tandem DSSCs architecture finds its usefulness in efficient photon harvesting due to improved light transmission and enhanced photons reaching to the bottom electrodes. The fabricated tandem performance was verified with visible light harvesting model dyes D131 and N719 as a proof of concept and provided the photoconversion efficiency (PCE) of 6.06% under simulated condition. Introduction of panchromatic photon harvesting by utilizing near infrared light absorbing Si-phthalocyanine dye in combination with the modified tandem DSSC architecture led to enhancement in the PCE up to 7.19%.

    DOI: 10.1088/1742-6596/704/1/012003

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  • Oxygen vacancy formation and migration in double perovskite Sr2CrMoO6: a first-principles study. 査読有り

    Shuai Zhao, Liguo Gao, Chunfeng Lan, Shyam S. Pandey, Shuzi Hayase, Tingli Ma

    RSC Advances   2016   2016年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c6ra05581h

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  • Design of far-red sensitizing squaraine dyes aiming towards the fine tuning of dye molecular structure 査読有り

    Morimoto T., Fujikawa N., Ogomi Y., Pandey S., Ma T., Hayase S.

    Journal of Nanoscience and Nanotechnology   16 ( 4 )   3282 - 3288   2016年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2016 American Scientific Publishers. All rights reserved.Model squaraine dyes having sharp and narrow absorptions mainly in the far-red wavelength region has been logically designed, synthesized and used for their application as sensitizer in the dye-sensitized solar cells (DSSC). In order to have fine control on energetics, dyes having same mother core and alkyl chain length varying only in molecular symmetry and position of substituent were designed. It has been found that even keeping all other structural factor constant, only positional variation of substituent leads to not only in the variation of energetics by 0.1 eV but affects the photovoltaic characteristics also. Optimum concentration of dye de-aggregating agent was found to be 100 times with respect to the sensitizing dye concentration. Amongst dyes utilized in this work best performance was obtained for unsymmetrical dye SQ-40 giving a photoconversion efficiency of 4.01% under simulated solar irradiation at global AM 1.5.

    DOI: 10.1166/jnn.2016.12304

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  • Indoor light performance of coil type cylindrical dye sensitized solar cells 査読有り

    Kapil G., Ogomi Y., Pandey S., Ma T., Hayase S.

    Journal of Nanoscience and Nanotechnology   16 ( 4 )   3183 - 3187   2016年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2016 American Scientific Publishers. All rights reserved.A very good performance under low/diffused light intensities is one of the application areas in which dye-sensitized solar cells (DSSCs) can be utilized effectively compared to their inorganic silicon solar cell counterparts. In this article, we have investigated the 1 SUN and low intensity fluorescent light performance of Titanium (Ti)-coil based cylindrical DSSC (C-DSSC) using ruthenium based N719 dye and organic dyes such as D205 and Y123. Electrochemical impedance spectroscopic results were analyzed for variable solar cell performances. Reflecting mirror with parabolic geometry as concentrator was also utilized to tap diffused light for indoor applications. Fluorescent light at relatively lower illumination intensities (0.2 mW/cm2 to 0.5 mW/cm2) were used for the investigation of TCO-less C-DSSC performance with and without reflector geometry. Furthermore, the DSSC performances were analyzed and compared with the commercially available amorphous silicon based solar cell for indoor applications.

    DOI: 10.1166/jnn.2016.12324

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  • Graphene-mediated highly-dispersed MoS2 nanosheets with enhanced triiodide reduction activity for dye-sensitized solar cells. 査読有り

    Chang Yua, Xiangtong Meng, Xuedan Song, Suxia Liang, Qiang Dong, Gang Wang, Ce Hao, Xichuan Yang, Tingli Ma, Pulickel M. Ajayanb, Jieshan Qiu

    Carbon   100   474 - 483   2016年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.carbon.2016.01.042

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  • First principles analysis of oxygen vacancy formation and migration in Sr2BMoO6 (B = Mg, Co, Ni). 査読有り

    Shuai Zhao,a Liguo Gao,b Chunfeng Lan,a Shyam S. Pandey,a Shuzi Hayasea and Tingli Ma*a

    RSC Advances   6   31968 - 31975   2016年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c6ra02297a

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  • Amorphous Inorganic Electron-Selective Layers for Efficient Perovskite Solar Cells: Feasible Strategy Towards Room-Temperature Fabrication. 査読有り

    Kai Wang,Yantao Shi,Bo Li,Liang Zhao,Wei Wang,Xiangyuan Wang,Xiaogong Bai,Shufeng Wang,Ce Hao, Tingli Ma*

    Advanced Materials   28 ( 9 )   1891 - 1897   2016年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/adma.201505241

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  • Catalytic activities enhanced by abundant structural defects and balanced N distribution of N-doped graphene in oxygen reduction reaction. 査読有り

    Xiaogong Bai, Yantao Shi, Jiahao Guo, Liguo Gao, Kai Wanga, Yi Du, Tingli Ma*

    Journal of Power Sources   306   85 - 91   2016年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.jpowsour.2015.10.081

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  • Investigation on structures, band gaps, and electronic structures of lead free La2NiMnO6 double perovskite materials for potential application of solar cell. 査読有り

    Chunfeng Lan, Shuai Zhao, Tingting Xu, Jie Ma, Shuzi Hayase, Tingli Ma

    Journal of Alloys and Compounds   655   208 - 214   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.jallcom.2015.09.187

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  • Enhancing the performance of transparent conductive oxide-less back contact dye-sensitized solar cells by facile diffusion of cobalt species through TiO<inf>2</inf> nanopores 査読有り

    Molla M., Kawano M., Baranwal A., Pandey S., Ogomi Y., Ma T., Hayase S.

    RSC Advances   6 ( 40 )   33353 - 33360   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry 2016.We report a back contact (BC) transparent conductive oxide (TCO)-less dye-sensitized solar cell (DSSC) fabricated utilizing a Co2+/3+ redox shuttle based electrolyte. A new strategy has been proposed for the reduction of the electrolyte layer by coating with a TiO2 nanoparticle spacer (TN spacer) with controlled thickness. The negatively charged TN spacer was found to decrease the diffusion of cobalt species through the TN spacer due to electrostatic interactions leading to a hampered photoconversion efficiency of 4.41%. This sluggish diffusion of bulky cobalt ions was amicably facilitated by passivating the negatively charged TN spacer surface with dye molecules. Facile transport of electrolyte ions in the nanopores of the passivated TN spacer was further confirmed by electrochemical impedance spectroscopy and estimation of the diffusion of Co3+ species in the nanopores of the passivated TN spacer using cyclic voltammetry. The TCO-less BC-DSSC in combination with the cobalt electrolyte fabricated in this novel device architecture exhibits a significantly improved photoconversion efficiency of 6.42% after the TN spacer was passivated with the porphyrin-based dye YD2-o-C8.

    DOI: 10.1039/c6ra04894c

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  • Earth-abundant and nano-micro composite catalysts of Fe3O4@reduced graphene oxide for green and economical mesoscopic photovoltaic devices with high efficiencies up to 9%. 査読有り

    Huawei Zhou, Jie Yin*, Zhonghao Nie, Zhaojin Yang, Dongjie Li, Junhu Wang, Xin Liu, Changzi Jin, Xianxi Zhang*, Tingli Ma*

    Journal of Materials Chemistry A   2016 ( 4 )   67 - 73   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c5ta06525a

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  • Antisolvent diffusion-induced growth, equilibrium behaviours in aqueous solution and optical properties of CH3NH3PbI3 single crystals for photovoltaic applications 査読有り

    Huawei Zhou, Zhonghao Nie, Jie Yin, Yuanwei Sun, Hongyan Zhuo, Daqi Wang, Dacheng Li, Jianmin Dou, Xianxi Zhang, Tingli Ma*

    RSC Advances   104 ( 5 )   85344 - 85349   2015年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c5ra17579h

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  • Effects of 4-tert-butylpyridine on perovskite formation and performance of solution-processed perovskite solar cells 査読有り

    Shi Y., Wang X., Zhang H., Li B., Lu H., Ma T., Hao C.

    Journal of Materials Chemistry A   3 ( 44 )   22191 - 22198   2015年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © The Royal Society of Chemistry.To obtain highly efficient perovskite solar cells (PSCs), effective controls on perovskite crystallinity, homogeneity, and surface morphology are crucial. Herein, we demonstrate the flexible and facile use of TBP to improve the crystallinity of perovskite in two-step or one-step routes. For the two-step route, addition of TBP into DMF when dissolving PbI2 for spin-coating resulted in a porous layer composed of randomly packed PbI2 nanocrystals. This approach subsequently offered a widely enlarged contact area facilitating interfacial reaction with CH3NH3I and greatly improved CH3NH3PbI3 crystallization. Based on this strategy, PCEs of CH3NH3PbI3-based PSCs were improved from 6.71% to 10.62% (i.e., 58% enhancement). For the one-step route, TBP as an additive resulted in orientational and better crystallinity, by which the PCEs of CH3NH3PbI3-xClx-based planar PSCs increased from 11.11% to 15.01%, showing a remarkable enhancement as high as 35%. Using TBP as one multifunctional additive, it is thought that our strategy in this work offers a new idea for the fabrication of highly efficient PSCs.

    DOI: 10.1039/c5ta05988g

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  • Synthesis of highly effective Pt/carbon fiber composite counter electrode catalyst for dye-sensitized solar cells

    Hongyue Guo, Yajing Zhu, Wenyan Li, Haikuo Zheng, Kezhong Wu, Keqiang Ding, Bei Ruan, Anders Hagfeldt, Tingli Ma, Mingxing Wu*

    Electrochimica Acta   176   997 - 1000   2015年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.electacta.2015.07.103

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  • Combining novel device architecture and NIR dye towards the fabrication of transparent conductive oxide-less tandem dye sensitized solar cells 査読有り

    Ajay Kumar Baranwal, Naotaka Fujikawa, Azwar Hayat, Yuhei Ogomi, Shyam S. Pandey, Tingli Ma and Shuzi Hayase

    Applied Physics Express   10 ( 8 )   2015年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.7567/APEX.8.102301

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    CiNii Article

  • Counter electrode materials combined with redox couples in dye- and quantum dot-sensitized solar cells. 査読有り

    Mingxing Wu,* Xiao Lin, Yudi Wang, Tingli Ma*

    Journal of Materials Chemistry A   2015 ( 3 )   19638 - 19656   2015年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c5ta03682h

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  • Investigation of metal xanthates as latent curing catalysts for epoxy resin via formation of in-situ metal sulfides 査読有り

    Vagvala T., Pandey S., Ogomi Y., Ma T., Hayase S.

    Inorganica Chimica Acta   435   292 - 298   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 Elsevier B.V. All rights reserved.Cu(I), Pb(II), Sb(III), Zn(II), Cd(II), In(III), Ga(III) xanthates were synthesized and characterized by <sup>1</sup>H NMR, <sup>13</sup>C NMR, infrared spectroscopy and elemental analysis. The final product of decomposition of metal xanthates at 200 °C subjected to XRD and EDS analysis, confirmed generation of metal sulfides. The curing behavior was analyzed by performing curing time investigation of epoxy composite as a function of temperature employing 5% metal xanthates as catalysts. None of the metal xanthates demonstrated any significant curing of epoxy composite prior to 150 °C proving their latent curing potency. Ga(III) xanthate exhibited comparatively the most effective catalytic property. Thermogravimetric analysis utilized to examine the thermal behavior of metal xanthates indicated, metal xanthates which are air-stable at ambient temperatures undergo latent decomposition upon thermal annealing. The order of curing time at a given temperature and the trend of decomposition temperature of metal xanthate under consideration was observed to be similar. XRD and EDS study of epoxy composite consisting of metal xanthates cured by thermal annealing illustrated generation of metal sulfide in-situ in the matrix. It was presumed that the phenomena of metal xanthates under investigation yielding corresponding in-situ metal sulfides in the epoxy composite upon thermal annealing in a latent fashion is responsible for exhibiting latent curing catalytic activity.

    DOI: 10.1016/j.ica.2015.07.020

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  • Electrocatalytic properties of iron chalcogenides as low-cost counter electrode materials for dye-sensitized solar cells 査読有り

    Jiahao Guo, Suxia Liang, Yantao Shi,* Bo Li, Ce Hao, Xuchun Wang, Tingli Ma

    RSC Advances   89 ( 5 )   72553 - 72561   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c5ra13147b

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  • CH&lt;inf&gt;3&lt;/inf&gt;NH&lt;inf&gt;3&lt;/inf&gt;PbI&lt;inf&gt;3&lt;/inf&gt; and CH&lt;inf&gt;3&lt;/inf&gt;NH&lt;inf&gt;3&lt;/inf&gt;PbI&lt;inf&gt;3- x&lt;/inf&gt;Cl&lt;inf&gt;x&lt;/inf&gt; in planar or mesoporous perovskite solar cells: Comprehensive insight into the dependence of performance on architecture 査読有り

    Shi Y., Xing Y., Li Y., Dong Q., Wang K., Du Y., Bai X., Wang S., Chen Z., Ma T., Ma T.

    Journal of Physical Chemistry C   119 ( 28 )   15868 - 15873   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 American Chemical Society.In perovskite solar cells (PSCs), issues of compatibility between the photoabsorber and the cell architecture arise. In this work, we systematically demonstrated the characteristics of PSCs with an organometal halide, CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf> or CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3-x</inf>Cl<inf>x</inf>, in a planar or mesoporous architecture, and the dependence of the cell photovoltaic performance on the architecture was illustrated in detail. In addition to the inherent photoelectric characteristics, CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf> and CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3-x</inf>Cl<inf>x</inf> also differ in other aspects, such as light absorption, crystallinity, surface coverage, and dissociation of the photogenerated electrons. For PSCs with CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf>, the mesoporous ones gave high power conversion efficiencies (PCE) of up to 14.05%, which is much higher than those of the planar ones (up to 6.76%). For PSCs with CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3-x</inf>Cl<inf>x</inf>, the planar and mesoporous devices exhibited PCEs of up to 12.67% and 7.87%, respectively, quite in contrast with the case of CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf>.

    DOI: 10.1021/acs.jpcc.5b02784

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  • Perovskite Solar Cell Using a Two-Dimensional Titania Nanosheet Thin Film as the Compact Layer 査読有り

    Can Li, Yahui Li, Yujin Xing, Zelin Zhang, Xianfeng Zhang, Zhen Li, Yantao Shi, Tingli Ma, Renzhi Ma, Kunlin Wang, and Jinquan Wei*

    ACS Applied Materials & Interfaces   7 ( 28 )   15117 - 15122   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/acsami.5b01959

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  • First principles study on the electronic and optical properties of B-site ordered double perovskite Sr2MMoO6 (M=Mg, Ca, and Zn). 査読有り

    Shuai Zhao, Chunfeng Lan, Jie Ma, Shyam S. Pandey, Shuzi Hayase, Tingli Ma*

    Solid State Communications   213-214   19 - 23   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.ssc.2015.04.012

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  • Insight into Perovskite Solar Cells Based on SnO2 Compact Electron-Selective Layer. 査読有り

    Qingshun Dong, Yantao Shi*, Kai Wang, Yu Li, Shufeng Wang, Hong Zhang, Yujin Xing, Yi Du, Xiaogong Bai, Tingli Ma*

    The Journal of Physical Chemistry C   119 ( 19 )   10212 - 10217   2015年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/acs.jpcc.5b00541

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  • Dye-sensitized solar cells based on axially ligated phosphorus-phthalocyanine dyes 査読有り

    Azwar Hayat, Gururaj M. Shivashimpi, Terumi Nishimura, Naotaka Fujikawa, Yuhei Ogomi, Yoshihiro Yamaguchi, Shyam S. Pandey, Tingli Ma and Shuzi Hayase*

    Applied Physics Express   8 ( 4 )   2015年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.7567/APEX.8.047001

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    CiNii Article

  • Low-Temperature Processed and Carbon-Based ZnO/CH3NH3PbI3/C Planar Heterojunction Perovskite Solar Cells. 査読有り

    Huawei Zhou, Yantao Shi, Kai Wang, Qingshun Dong, Xiaogong Bai, Yujin Xing, Yi Du, and Tingli Ma

    Journal of Physical Chemistry C   119 ( 9 )   4600 - 4605   2015年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/jp512101d

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  • Low-Temperature and Solution-Processed Amorphous WOX as Electron-Selective Layer for Perovskite Solar Cells. 査読有り

    Kai Wang, Yantao Shi*, Qingshun Dong, Yu Li, Shufeng Wang, Xufeng Yu, Mengyao Wu, Tingli Ma*

    The Journal of Physical Chemistry Letters   6 ( 5 )   755 - 759   2015年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/acs.jpclett.5b00010

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  • Atomically thin MoSe<inf>2</inf>/graphene and WSe<inf>2</inf>/graphene nanosheets for the highly efficient oxygen reduction reaction 査読有り

    Guo J., Guo J., Shi Y., Bai X., Wang X., Ma T., Ma T.

    Journal of Materials Chemistry A   3 ( 48 )   24397 - 24404   2015年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 The Royal Society of Chemistry.As a conceptually new class of 2D materials, inorganic graphene analogue (IGA) ultrathin nanosheets perform an increasingly vital function in various electronic devices. However, the relatively low electrical conductivity of IGA ultrathin nanosheets severely hampers their application as electrode materials in devices. Through in situ synthesis, we report the combination of inorganic graphene and graphene into atomically thin nanosheets as efficient electrocatalysts for the oxygen reduction reaction (ORR). Benefitting from the advantages of both IGAs and reduced graphene oxide, the g-MoSe2 and g-WSe2 nanocomposites showed excellent ORR activity associated with a number of exchanged electrons close to four, which corresponded to the complete reduction of oxygen into water. In particular, the two electrocatalysts exhibited a positive onset potential of -0.02 V (close to that of Pt/C, 0.02 V) and a high kinetic current density (JK) of 10.22 mA cm-2 for g-MoSe2 and 10.77 mA cm-2 for g-WSe2 at -0.20 V. Compared with commercial Pt/C, these catalysts possess outstanding long-term durability and fuel crossover resistance capacity in alkaline media. Therefore, nanocomposites of inorganic graphene and graphene can be developed into low-cost and efficient alternatives (to the noble metal Pt) to be used as cathodic electrodes in fuel cells.

    DOI: 10.1039/c5ta06909b

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  • Transparent conductive oxide-less back contact dye-sensitized solar cells using cobalt electrolyte 査読有り

    Molla M., Mizukoshi N., Furukawa H., Ogomi Y., Pandey S., Ma T., Hayase S.

    Progress in Photovoltaics: Research and Applications   23 ( 9 )   1100 - 1109   2015年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Copyright © 2014 John Wiley & Sons, Ltd.Transparent conductive oxide-less (TCO-less) dye-sensitized solar cells (DSSCs) have been fabricated and characterized using nanoporous TiO<inf>2</inf>-coated stainless steel metal mesh as flexible photoanode and cobalt bipyridyl complex (Co(bpy))-based one electron redox shuttle electrolyte. Attempts have been made towards enhancing the efficiency of TCO-less DSSCs to match with their TCO-based DSSC counterparts. It has been found that surface protection of metal mesh is highly required for enhancing the efficiency of TCO-less DSSCs specially using cobalt electrolytes as confirmed by dark current-voltage characteristics. Photocurrent action spectra clearly reveal that TCO-based DSSCs using (Co(bpy)) electrolyte exhibits photon harvesting (incident photon to current conversion efficiency (IPCE) 52%) in the 370-450 nm wavelength region as compared to photon harvesting at peak absorption of the dye (IPCE 56% at 550 nm), which is almost the same (IPCE 47%) in the 400-610 nm wavelength region for TCO-less DSSCs. Under similar experimental conditions, replacing indoline dye D-205 to porphyrin-based dye YD2-o-C8 led to the enhancement in the photoconversion efficiency from 3.33% to 4.84% under simulated solar irradiation.

    DOI: 10.1002/pip.2526

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  • Synthesis of CH<inf>3</inf>NH<inf>3</inf>Sr<inf>x</inf>Pb<inf>(1-x)</inf>I<inf>3</inf>with less Pb content and its application in all-solid thin film solar cells 査読有り

    Bai X., Shi Y., Wang K., Dong Q., Xing Y., Zhang H., Wang L., Ma T., Ma T.

    Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica   31 ( 2 )   285 - 290   2015年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © Editorial office of Acta Physico-Chimica Sinica.Hybrid organic-inorganic lead halide perovskite solar cells (PSCs) have recently undergone rapid progress and exhibit high photoelectric conversion efficiencies of up to 19.3%. As light-absorber in PSCs, the hybrid organic-inorganic lead halide perovskite cannot be used in large-scale applications because of its high Pb content. In this work, we replaced some Pb with Sr to synthesize a novel perovskite CH3NH3SrxPb(1-x)I3and used it as a light-absorber in PSCs. Compared with CH3NH3PbI3, CH3NH3Sr0.3Pb0.7I3is a better light-absorber but the corresponding photovoltaic performance in PSCs decreased obviously.

    DOI: 10.3866/PKU.WHXB201412241

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  • Relationship between diffusion of Co<sup>3+</sup>/Co<sup>2+</sup> redox species in nanopores of porous titania stained with dye molecules, dye molecular structures, and photovoltaic performances 査読有り

    Kawano M., Nishiyama T., Ogomi Y., Pandey S., Ma T., Hayase S.

    RSC Advances   5 ( 102 )   83725 - 83731   2015年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 The Royal Society of Chemistry.Diffusion of Co2+ and Co3+ in nanopores of porous titania stained with various dyes were evaluated and were compared with those of I-, and I3-. Diffusion of Co3+ in the bare nanopore was slower than that of I3-. Dyes adsorbed on the wall of nanopores affected these diffusion coefficients remarkably. The Co3+ diffusion in nanopores became faster when the nanopore wall was covered with dyes with long alkyl groups, probably because the long alkyl groups suppress the interaction between TiO2 surface and Co3+. Higher open circuit voltage (Voc) was obtained for the DSSC with fast Co3+ diffusion in nanopores because the fast diffusion suppresses the charge recombination between electrons in titania and Co3+ remaining in the nanopores. The fast diffusion in nanopores was applied to thin nanoparticle spacer (th: 5 μm) of DSSCs. After nanoparticle spacer was stained with dyes with long alkyl groups, the efficiency drastically increased from 2.8% to 5.3%.

    DOI: 10.1039/c5ra11992h

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  • Single-atom catalysis in mesoporous photovoltaics: The principle of utility maximization 査読有り

    Shi Y., Zhao C., Wei H., Guo J., Liang S., Wang A., Zhang T., Liu J., Ma T.

    Advanced Materials   26 ( 48 )   8147 - 8153   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.(Graph Presented) FeOx-supported single Pt atoms are used for the first time as counter electrodes (CEs) in dye-sensitized solar cells (DSCs), which are mesoporous photovoltaic devices. This system enables the investigation of the electrocatalytic behavior of a single-atom catalyst (SAC). Compared with conventional Pt CEs, the SAC-based CEs exhibit better reversibility as indicated by the peak-to-peak separation (Epp). A high degree of atom utilization is demonstrated.

    DOI: 10.1002/adma.201402978

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  • Highly effective Pt/MoSi2 composite counter electrode catalyst for dye-sensitized solar cell 査読有り

    Wu M., Lin Y., Guo H., Ma T., Hagfeldt A.

    Journal of Power Sources   263   154 - 157   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    MoSi2 is introduced into dye-sensitized solar cell (DSC) as counter electrode (CE) catalyst for the first time, and the DSC produces power conversion efficiency (PCE) of 4.87%. To improve the catalytic activity, Pt/MoSi2 composite catalyst is synthesized and it is found that 1.13 wt% of Pt loading is enough for achieving high catalytic activity. After optimization, the DSC using the Pt/MoSi2 composite CE shows high PCE of 7.68%, close to the Pt CE based DSC (7.94%). © 2014 Published by Elsevier B.V.

    DOI: 10.1016/j.jpowsour.2014.04.029

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  • Selenium as a photoabsorber for inorganic-organic hybrid solar cells 査読有り

    Wang K., Shi Y., Zhang H., Xing Y., Dong Q., Ma T.

    Physical Chemistry Chemical Physics   16 ( 42 )   23316 - 23319   2014年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © the Partner Organisations 2014.As an inorganic photoabsorber, selenium was used in a mesoscopic solar cell with a hybrid organic-inorganic structure of TiO2/Se/P3HT/PEDOT:PSS/Ag, in which the Se layer was prepared by vacuum thermal deposition and post thermal treatment. The microstructure, photoelectrical properties, as well as the rationality in structural design of the solar cell were illustrated in detail. Finally, the hybrid solar cell demonstrated a photoelectric conversion efficiency of 2.63%. This journal is

    DOI: 10.1039/c4cp02821j

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  • Pt-free counter electrode for dye-sensitized solar cells with high efficiency 査読有り

    Yun S., Hagfeldt A., Ma T.

    Advanced materials (Deerfield Beach, Fla.)   26 ( 36 )   6210 - 6237   2014年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Dye-sensitized solar cells (DSSCs) have attracted widespread attention in recent years as potential cost-effective alternatives to silicon-based and thin-film solar cells. Within typical DSSCs, the counter electrode (CE) is vital to collect electrons from the external circuit and catalyze the I3- reduction in the electrolyte. Careful design of the CEs can improve the catalytic activity and chemical stability associated with the liquid redox electrolyte used in most cells. In this Progress Report, advances made by our groups in the development of CEs for DSSCs are reviewed, highlighting important contributions that promise low-cost, efficient, and robust DSSC systems. Specifically, we focus on the design of novel Pt-free CE catalytic materials, including design ideas, fabrication approaches, characterization techniques, first-principle density functional theory (DFT) calculations, ab-initio Car-Parrinello molecular dynamics (CPMD) simulations, and stability evaluations, that serve as practical alternatives to conventional noble metal Pt electrodes. We stress the merits and demerits of well-designed Pt-free CEs, such as carbon materials, conductive polymers, transition metal compounds (TMCs) and their corresponding hybrids. Also, the prospects and challenges of alternative Pt catalysts for their applications in new-type DSSCs and other catalytic fields are discussed.

    DOI: 10.1002/adma.201402056

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  • All-solid perovskite solar cells with HOCO-R-NH<inf>3</inf><sup>+</sup>I<sup>-</sup> anchor-group inserted between porous titania and perovskite 査読有り

    Ogomi Y., Morita A., Tsukamoto S., Saitho T., Shen Q., Shen Q., Toyoda T., Toyoda T., Yoshino K., Yoshino K., Pandey S., Ma T., Hayase S., Hayase S.

    Journal of Physical Chemistry C   118 ( 30 )   16651 - 16659   2014年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    HOCO-R-NH3+I monolayer working as an anchor for perovskite (CH3NH3PbI3 (abbreviation: PEROVI3)) was inserted between the surface of porous metal oxide (titania or alumina) and the PEROVI3. Power conversion efficiency (PCE) of PEROVI3 solar cells increased from 8% to 10% after the HOCO-R-NH3+I- monolayer was inserted. Moreover, PCE of 12% was achieved for cells fabricated at optimized conditions. This increase in the efficiency was explained by retardation of charge recombination, and better PEROVI3 crystal growth, which improves PEROVI3 network on these porous metal oxides. It was proved that PEROVI3 crystal growth can be controlled by HOCO-R-NH3+I- on these porous metal oxides. © 2014 American Chemical Society.

    DOI: 10.1021/jp412627n

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  • Recent progress of counter electrode catalysts in dye-sensitized solar cells 査読有り

    Wu M., Ma T., Ma T.

    Journal of Physical Chemistry C   118 ( 30 )   16727 - 16742   2014年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    To realize long-term developments and practical application of the dye-sensitized solar cells (DSCs) requires a robust increase of the power conversion efficiency (PCE) and a significant decrease of the production cost. Fortunately, a new record PCE value of 12.3% was achieved by using cobalt-based redox couples combined with organic dye. Evidently, dye design is the key path to improve the PCE, while developing low cost counter electrode (CE) catalysts is one of the promising paths to reduce the production cost of DSCs by replacing the expensive Pt CE. In this article, we review the recent progress of CE catalysts involving Pt, carbon materials, inorganic materials, multiple compounds, polymers, and composites. We discuss the advantages and disadvantages of each catalyst and put forward ideas for designing new CE catalysts in future research for DSCs and other application fields. © 2014 American Chemical Society.

    DOI: 10.1021/jp412713h

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  • Synthesis of highly effective vanadium nitride (VN) peas as a counter electrode catalyst in dye-sensitized solar cells 査読有り

    Wu M., Guo H., Lin Y., Wu K., Ma T., Hagfeldt A.

    Journal of Physical Chemistry C   118 ( 24 )   12625 - 12631   2014年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Vanadium nitride (VN) peas and cubes were synthesized by regulating the molar ratio of the starting materials (urea/VOCl3) via the urea-metal chloride route. The as-prepared VN compounds were subsequently introduced into dye-sensitized solar cells (DSCs) as counter electrode (CE) catalysts for the regeneration of novel organic thiolate/disulfide (T-/T2) and traditional iodide/triiodide (I-/I3-) redox couples. The cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curve results proved that the catalytic activity of the prepared VN was significantly affected by particle shape and particle size. The VN peas showed the highest catalytic activity, followed by the small VN cubes and large VN cubes. The I-/I3-- electrolyte-based DSCs yielded a high power conversion efficiency (PCE) of 7.29%. The Pt-free VN CE catalysts are more suitable for the new organic redox couples of T-/T2. The DSCs based on VN peas CE showed a PCE of 5.57%, an enhancement of 40.7% relative to the Pt-CE-based DSCs (3.96%). © 2014 American Chemical Society.

    DOI: 10.1021/jp501797e

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  • A dual functional additive for the HTM layer in perovskite solar cells 査読有り

    Zhang H., Shi Y., Yan F., Wang L., Wang K., Xing Y., Dong Q., Ma T., Ma T.

    Chemical Communications   50 ( 39 )   5020 - 5022   2014年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The ionic liquid N-butyl-N′-(4-pyridylheptyl)imidazolium bis(trifluoromethane)sulfonimide (BuPyIm-TFSI) was used as a dual-functional additive to improve the electrical properties of the hole-transporting material (HTM) for perovskite solar cells. BuPyIm-TFSI improved the conductivity of HTM and reduced the dark current of the solar cell simultaneously, thereby greatly increasing the power conversion efficiency. © 2014 The Partner Organisations.

    DOI: 10.1039/c3cc49458f

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  • Influence of different substituents linked on fluorene spacer in organic sensitizers on photovoltaic properties 査読有り

    Ci Z., Yu X., Wang C., Ma T., Bao M.

    Dyes and Pigments   104   8 - 14   2014年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    New metal-free organic sensitizers containing a fluorene unit as a π-conjugated system, a diphenylamine as an electron donor, and a cyanoacrylic acid moiety as an electron acceptor were synthesized and used for dye-sensitized solar cells. The photophysical and electrochemical properties of these dyes were investigated, and their performances as sensitizers in solar cells were measured. One solar cell containing the n-hexyl group in the fluorene unit produced an η of 5.15% (Jsc = 9.69 mA cm-2, Voc = 0.77 V, and ff = 0.70) under 100 mW cm-2 simulated AM 1.5 G solar irradiation (100 mW cm-2). © 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.dyepig.2013.12.020

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  • Boron-doped graphene as a high-efficiency counter electrode for dye-sensitized solar cells 査読有り

    Fang H., Yu C., Ma T., Qiu J.

    Chemical Communications   50 ( 25 )   3328 - 3330   2014年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Boron-doped graphene, synthesized by annealing a mixture of graphite oxide and B2O3, has shown a high conversion efficiency of 6.73% as a counter electrode (CE) for dye-sensitized solar cells, which is better than the Pt CE. © The Royal Society of Chemistry 2014.

    DOI: 10.1039/c3cc48258h

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  • Room temperature solution processed tungsten carbide as an efficient hole extraction layer for organic photovoltaics 査読有り

    Cui W., Wu Z., Liu C., Wu M., Ma T., Wang S., Lee S., Sun B.

    Journal of Materials Chemistry A   2 ( 11 )   3734 - 3740   2014年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We demonstrated tungsten carbide (WC) as an efficient anode buffer layer for a high-performance inverted organic solar cell. The devices based on active layers comprised of either poly(3-hexylthiophene) (P3HT) or poly[[4,8-bis[(2- ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) mixed with fullerene derivatives have achieved power conversion efficiencies (PCEs) of 3.83% and 8.04%, respectively. The WC layer was deposited onto the active layer from a surfactant-free nanoparticle alcohol solution because the buffer layer was well functionalized, removing the requirement for oxygen-plasma or annealing treatment, while simultaneously allowing for optimum photogenerated charge-carrier collection in an inverted structure device. The WC-based device displayed an improved stability performance compared with the MoO 3-based one. The anode buffer layer introduced here was easy to implement and compatible with solution processed organic photovoltaics, and therefore applicable for potential cost-effective manufacturing processes. © 2014 The Royal Society of Chemistry.

    DOI: 10.1039/c3ta13473c

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  • CH3NH3SnxPb(1-x)I3 perovskite solar cells covering up to 1060 nm 査読有り

    Ogomi Y., Morita A., Tsukamoto S., Saitho T., Fujikawa N., Shen Q., Shen Q., Toyoda T., Toyoda T., Yoshino K., Yoshino K., Pandey S., Ma T., Hayase S., Hayase S.

    Journal of Physical Chemistry Letters   5 ( 6 )   1004 - 1011   2014年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We report photovoltaic performances of all-solid state Sn/Pb halide-based perovskite solar cells. The cell has the following composition: F-doped SnO 2 layered glass/compact titania layer/porous titania layer/CH 3NH3SnxPb(1-x)I3/ regioregular poly(3-hexylthiophene-2,5-diyl). Sn halide perovskite itself did not show photovoltaic properties. Photovoltaic properties were observed when PbI2 was added in SnI2. The best performance was obtained by using CH3NH3Sn0.5Pb0.5I 3 perovskite. 4.18% efficiency with open circuit voltage 0.42 V, fill factor 0.50, and short circuit current 20.04 mA/cm2 are reported. The edge of the incident photon to current efficiency curve reached 1060 nm, which was 260 nm red-shifted compared with that of CH3NH 3PbI3 perovskite solar cells. © 2014 American Chemical Society.

    DOI: 10.1021/jz5002117

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  • Interlaced W18O49 nanofibers as a superior catalyst for the counter electrode of highly efficient dyesensitized solar cells 査読有り

    Huawei Zhou,Yantao Shi,Qingshun Dong,Yanxiang Wang,Chao Zhu,Liang Wang,Ning Wang,Ying Wei, Shengyang Tao,Tingli Ma

    J. Mater. Chem. A   2014 ( 12 )   4347 - 4354   2014年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ta14345g

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  • Enhanced performance of supported HfO2 counter electrodes for redox couples used in dye-sensitized solar cells 査読有り

    Yun S., Pu H., Chen J., Hagfeldt A., Ma T.

    ChemSusChem   7 ( 2 )   442 - 450   2014年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Mesoporous-graphitic-carbon-supported HfO2 (HfO2-MGC) nanohybrids were synthesized by using a soft-template route. Characterization and a systematic investigation of the catalytic properties, stability, and catalytic mechanism were performed for HfO2-MGC counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). The new HfO2-MGC as a CE in DSSCs showed a surprisingly high efficiency of 7.75% for the triiodide/iodide redox couple and 3.69% for the disulfide/thiolate redox couple, greater than the Pt electrode in the corresponding electrolyte system, which opens up a possibility for its practical application. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/cssc.201301140

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  • Screen-printed Pt counter electrodes exhibiting high catalytic activity 査読有り

    Zhao C., Shi Y., Zhong Z., Ma T., Ma T.

    Cuihua Xuebao/Chinese Journal of Catalysis   35 ( 2 )   219 - 226   2014年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Counter electrodes (CEs) for dye-sensitized solar cells (DSCs) are important for collecting electrons and catalyzing the iodide/tri-iodide reaction. Pt CEs are commonly prepared by magnetron sputtering, which is expensive and requires vacuum conditions. Incorporating the low cost surfactant Span-85 improved the adhesion between the Pt particles and conductive substrate, and allowed Pt-based CEs to be screen-printed. The screen-printed CE was compared with those prepared by dip-coating and spin-coating. Photoelectric conversion efficiencies of 7.30%, 6.96% and 7.03% were achieved for DSCs containing screen-printed, dip-coated and spin-coated CEs, respectively. Optical transmittance measurements, scanning electron microscopy, and film adhesion tests results showed that the surfactant improved film adhesion and increased transmittance, and the screen-printed CEs exhibited comparable transmittance to the dip-coated CEs. Screen-printing resulted in Pt particles being more uniformly distributed on the substrate, when compared with dip-coating or spin-coating. Cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel-polarization curves showed that the catalytic activity of the screen-printed Pt-based CEs were higher than that of the other CEs. Screen-printing is suitable for realizing the low-cost large-scale production of large Pt-based CEs. © 2014, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

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  • Transparent conductive oxide-less back contact dye-sensitized solar cells using Zinc porphyrin dye employing cobalt complex redox shuttle 査読有り

    Molla M., Pandey S., Ogomi Y., Ma T., Hayase S.

    2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014   1538 - 1542   2014年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2014 IEEE.A transparent conductive oxide-less (TCO-less) dye-sensitized solar cell (DSSC) consisting of back-contacted stainless steel metal mesh electrode has been fabricated. In this work, [Co(bpy)3]3+/2+ complex based redox electrolyte and porphyrin dye as sensitizer were utilized. Owing to relatively deeper redox energy level for cobalt based electrolytes as compared to I3-/I- redox system, possibility of obtaining high open-circuit voltage was explored. Employing a thin film of Ti on the metal mesh as the charge recombination blocking layer resulted in enhanced photoconversion efficiency. TCO-less DSSC in combination with cobalt electrolyte gave the power conversion efficiency of 4.89% under simulated solar irradiation.

    DOI: 10.1109/PVSC.2014.6925209

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  • Titanium wire engineering and its effect on the performance of coil type cylindrical dye sensitized solar cells 査読有り

    Kapil G., Pandey S., Ogomi Y., Ma T., Hayase S.

    Organic Electronics: physics, materials, applications   15 ( 11 )   3399 - 3405   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2014 Elsevier B.V. All rights reserved.This paper reports a comparative study of the photovoltaic characteristics of titanium (Ti) metal wires with different diameter and surface treatments towards their utilization as photoanodes for coil-based dye-sensitized solar cells. The surface property of the Ti wire, especially oxidized overlayer and surface treatments have been found to greatly influence the adhesion as well as optimum electrical contact between coated nanoporous titanium oxide (TiO2) and Ti-wires. Implication of adhesion of nanoporous TiO2 on the titanium wire and its influence on photovoltaic performance was analyzed using electrochemical impedance spectroscopy. Results of X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy reveals the formation of anatase TiO2 nanosheets after the H2O2 surface treatment on the titanium wire resulting into enhancement in the extent of dye loading leading to enhanced photoconversion efficiency of 4.71% under simulated solar irradiation.

    DOI: 10.1016/j.orgel.2014.09.023

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  • Tandem dye-sensitized solar cells with a back-contact bottom electrode without a transparent conductive oxide layer 査読有り

    Baranwal A., Shiki T., Ogomi Y., Pandey S., Ma T., Hayase S.

    RSC Advances   4 ( 88 )   47735 - 47742   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © the Partner Organisations 2014.We report on the architecture of tandem dye-sensitized solar cells (DSSCs) with a back-contact bottom electrode without a transparent conductive oxide layer (TCO-less tandem DSSCs). The bottom electrode consists of glass/stained porous TiO2/back-contact porous metal. As the structure has fewer TCO layers than simple mechanical stack tandem DSSCs, more light reaches the bottom electrode. Two model dyes (D131 and N719) were used to confirm the tandem performance of the cells. The open-circuit voltage (Voc) was the sum of the Voc of the top cell and the Voc of the TCO-less bottom cell, showing that the cell worked as a tandem cell. The power conversion efficiency of the TCO-less tandem DSSC (7.10%) was greater than that of the stack tandem DSSCs (6.28%). This journal is

    DOI: 10.1039/c4ra07539k

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  • Superior catalytic activity of sub-5 μm-thick Pt/SiC films as counter electrodes for dye-sensitized solar cells 査読有り

    Yun S., Hagfeldt A., Ma T.

    ChemCatChem   6 ( 6 )   1584 - 1588   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cells with sub-5 μm-thick Pt/SiC-P (1.79 at. % Pt), Pt/SiC-M (0.45 at. % Pt), and Pt/SiC-R (0.39 at. % Pt) counter electrode (CE) films fabricated by using three different processes produced power conversion efficiencies of 6.82, 7.64, and 7.04 % that reached 86.5, 97.0, and 89.3 %, respectively, of the level obtained by using a print-Pt CE (7.88 %). These materials can reduce the cost of CEs and solve challenges involving Pt. The power of film: A small amount of Pt nanoparticles highly distributed on a SiC surface (Pt/SiC) shows superior catalytic activity for I3- reduction. Three different sub-5 μm-thick Pt/SiC films serving as counter electrodes in dye-sensitized solar cells show power conversion efficiencies of 6.82, 7.64, and 7.04 % and respectively reach 86.5, 97.0, and 89.3 % of the level obtained by using a print-Pt counter electrode (7.88 %). © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/cctc.201402003

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  • Promotional effect of silver nanoparticles on the performance of N-doped TiO<inf>2</inf> photoanode-based dye-sensitized solar cells 査読有り

    Lim S., Pandikumar A., Huang N., Lim H., Lim H., Gu G., Ma T.

    RSC Advances   4 ( 89 )   48236 - 48244   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © the Partner Organisations 2014.We report the first successful application of an N-TiO2-Ag nanocomposite as an efficient photoanode for highly efficient dye-sensitized solar cells (DSSC). The N-TiO2-Ag nanocomposites with different Ag contents were prepared using a simple chemical reduction method and characterized using various suitable techniques. The DSSC assembled with the N-TiO2-Ag-modified photoanode demonstrated an enhanced solar-to-electrical energy conversion efficiency of 8.15% compared to the photoanode of a DSSC composed of unmodified TiO2 (2.19%) under full sunlight illumination (100 mW cm-2, AM 1.5 G). This superior DSSC performance was due to the reduced band gap energy and retarded charge recombination that resulted from the introduction of plasmonic Ag nanoparticles on the surface of N-TiO2. The influence of the Ag content on the overall efficiency was also investigated, and the optimum Ag content for N-TiO2 was found to be 10 wt%. The enhanced solar energy conversion efficiency demonstrated by the N-TiO2-Ag nanocomposite makes it a promising alternative to conventional photoanode-based DSSCs. This journal is

    DOI: 10.1039/c4ra09775k

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  • Monolithic coal-based carbon counter electrodes for highly efficient dye-sensitized solar cells 査読有り

    Wang C., Meng F., Wang T., Ma T., Qiu J.

    Carbon   67   465 - 474   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A novel method for the preparation of monolithic coal-based porous carbon counter electrodes (CEs) for high performance dye-sensitized solar cells has been reported. Rigid monolithic coal-based carbon CE has been synthesized by preferential densification of one side of porous carbon plate formulated by caking bituminous coal powder. The phase, surface composition, and surface micro&nanotexture of the monolithic porous carbon plates have been characterized by X-ray diffraction, X-ray photoelectron energy spectroscopy, nitrogen sorption, scanning electron microscopy, and transmission electron microscopy. The coalbased carbon monolithic CEs exhibit a low internal resistance and high energy conversion efficiency (up to 6.38%). When the surface of the porous substrate was modified with mesoporous carbon as catalytic layer, the energy conversion efficiency can be further enhanced up to 8.73%, which is comparable to that of the platinized fluorine-doped tin oxide glass based device. © 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2013.10.019

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  • Influence of different electron acceptors in organic sensitizers on the performance of dye-sensitized solar cells 査読有り

    Yu X., Ci Z., Liu T., Feng X., Wang C., Ma T., Bao M.

    Dyes and Pigments   102   126 - 132   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Five kinds of triphenylamine-based organic dyes with different electron acceptors were designed and synthesized as sensitizers for dye-sensitized solar cells (DSSCs). The photophysical and electrochemical properties of these dyes were investigated and their performance as sensitizers in DSSCs was measured. The dye with cyanoacrylic acid electron acceptor exhibits the highest solar-to-electrical energy conversion efficiency of 4.93% (short-circuit photocurrent density Jsc = 8.59 mA cm-2, open-circuit photovoltage Voc = 0.77 V, and fill factor ff = 0.75) under 100 mW cm-2-simulated AM 1.5 G solar irradiation. © 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.dyepig.2013.10.045

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  • High electrocatalytic activity of W<inf>18</inf>O<inf>49</inf>nanowires for cobalt complex and ferrocenium redox mediators 査読有り

    Zhou H., Shi Y., Dong Q., Wang L., Zhang H., Ma T.

    RSC Advances   4 ( 79 )   42190 - 42196   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © the Partner Organisations 2014.Understanding the relationship between the surface of electrocatalysts and the catalytic properties of different redox mediators is beneficial to the rational design of efficient catalysts for use in practical catalytic processes. Previous research observed that surface oxygen vacancies (SOVs) affected the catalytic activity for triiodide/iodide (I-/I3-) and T2/T-(T-= 5-mercapto-1-methyltetrazole ion) redox mediators in dye-sensitized solar cells (DSCs). However, the electrocatalytic properties of larger and steric metal complex redox mediators (cobalt complex, ferrocenium) on SOVs of W18O49are unclear and have never been reported. In this study, we investigated the electrocatalytic properties of cobalt complex and ferrocenium redox mediators on SOVs of W18O49. Results indicated that the catalytic performance of W18O49nanowires (NWs) as a counter electrode for cobalt complex and ferrocenium redox mediators was comparable to that of Pt. After SOVs filling, the reduction reaction activity of the cobalt complex decreases slightly whereas it increases slightly for ferrocenium. These findings enrich our understanding of heterogeneous catalytic reactions on the surface of transition metal complexes for different redox mediators. This journal is

    DOI: 10.1039/c4ra07906j

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  • Fabrication and characterization of coil type transparent conductive oxide-less cylindrical dye-sensitized solar cells 査読有り

    Kapil G., Ohara J., Ogomi Y., Pandey S., Ma T., Hayase S.

    RSC Advances   4 ( 44 )   22959 - 22963   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Flexible metal wires were used to fabricate transparent conductive oxide (TCO)-less cylindrical dye-sensitized solar cells (DSSCs) with a very easy and fast fabrication process. The nature of the wire and interfacial contact between the metal wire and nanoporous TiO2 layer affected the charge transport giving the photoconversion efficiency of 3.88%. © 2014 the Partner Organisations.

    DOI: 10.1039/c4ra02999b

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  • All-solid Sn/Pb halide perovskite sensitized solar cells 査読有り

    Ogomi Y., Morita A., Tsukamoto S., Saitho T., Fujikawa N., Qing S., Qing S., Toyoda T., Toyoda T., Yoshino K., Yoshino K., Pandey S., Ma T., Hayase S., Hayase S.

    2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014   151 - 155   2014年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2014 IEEE.We have succeeded in harvesting energy in near infrared region (NIR) by using air stable Sn doped metal halide perovskite materials. The edge of the incident photon to current efficiency (IPCE) edge reached 1060 nm. 4.18 % efficiency is reported. The photovoltaic performance was compared with Pb halide perovskite solar cell with 14.4% efficiency, leading to the conclusion that the low FF and Voc are associated with low shunt resistance (Rsh). One of the methods to suppress the charge recombination will be reported, which includes passivation of porous titania surface states with aminoacid HI salts. The relationship among the surface states of titaniaor alumina, and crystallinity of the perovskites induced by surface passivation molecules, and photovoltaic performances are discussed.

    DOI: 10.1109/PVSC.2014.6925439

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  • Low-cost pt-free counter electrode catalysts in dye-sensitized solar cells 査読有り

    Wu M., Ma T.

    Green Energy and Technology   ( 9781447164722 )   77 - 87   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © Springer-Verlag London 2014. Dye-sensitized solar cells (DSCs) are potential candidates to silicon solar cells due to their merits of simple fabrication procedure, low-cost, and good plasticity. Till date, great advances have been achieved in the design of dyes, redox couples, and counter electrode (CE) catalysts for DSCs and the highest energy conversion efficiency is up to 12.3%. In this part, our attention focuses on CE catalysts. Besides Pt, carbon materials, conductive polymers, transition metal compounds (carbides, nitrides, oxides, sulfides, phosphides, selenides), and composite catalysts, denoted as Pt-free catalysts, have been introduced into DSCs as CE catalysts. In the following sections, we give a summary of Pt-free CE catalysts and highlight the advantages and disadvantages of each variety of Pt-free catalysts.

    DOI: 10.1007/978-1-4471-6473-9_4

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  • Composite Catalyst of Rosin Carbon/Fe3O4: Highly Efficient Counter Electrode for Dye-Sensitized Solar Cell 査読有り

    Liang Wang, Yantao Shi*, Yanxiang Wang, Hong Zhang, Hua wei Zhou, Ying Wei, Shengyang Tao ,Tingli Ma*

    Chem. Commun.   2014 ( 50 )   1701 - 1703   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3cc47163b

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  • Dye-sensitized solar cells from fundamental research to application 査読有り

    Ma T., Shi Y., Wang L., Zhou H., Guo J.

    Advanced Optoelectronics for Energy and Environment, AOEE 2013   2013年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    In this paper, we will report the recent progress in improvement of efficiency and reduction of cost of DSCs. In particular, the preparation of high-performance DSC materials and the fabrication of quasi-solid and all-solid large-sized DSCs based on rigid and flexible substrates will be presented. © OSA 2013.

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  • From Marine Plant to Photovoltaic Devices 査読有り

    Liang Wang, Yantao Shi*, Xiaogong Bai, Yujin Xing, Hong Zhang, Lin Wang, Wei Guo, Ning Wang, Tingli Ma*, Michael Gratzel

    Energy & Environmental Science   2014 ( 7 )   343 - 346   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ee42767f

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  • Low-cost and high-performance CoMoS<inf>4</inf> and NiMoS<inf>4</inf> counter electrodes for dye-sensitized solar cells 査読有り

    Zheng X., Guo J., Shi Y., Xiong F., Zhang W., Ma T., Li C.

    Chemical Communications   49 ( 83 )   9645 - 9647   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Porous chalcogels CoMoS4 and NiMoS4 made by a facile solution reaction displayed good electrocatalytic activity in the redox reaction of the I-/I3- shuttle. Dye-sensitized solar cells with these ternary compounds as counter electrodes (CEs) showed photovoltaic performance similar to the devices made with noble metal platinum CE (7.46%). © The Royal Society of Chemistry 2013.

    DOI: 10.1039/c3cc45064c

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  • Morphology dependence of performance of counter electrodes for dye-sensitized solar cells of hydrothermally prepared hierarchical Cu2ZnSnS4 nanostructures 査読有り

    Yahong Xie*, Chunyang Zhang, Fan Yue, Yun Zhang, Yantao Shi ,TingliMa

    RSC Advances   2013 ( 3 )   23264 - 23268   2013年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ra43731k

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  • A low-cost bio-inspired integrated carbon counter electrode for high conversion efficiency dye-sensitized solar cells 査読有り

    Wang C., Meng F., Wu M., Lin X., Wang T., Qiu J., Ma T.

    Physical Chemistry Chemical Physics   15 ( 34 )   14182 - 14187   2013年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A novel bio-inspired Pt- and FTO-free integrated pure carbon counter electrode (CE) for dye-sensitized solar cells (DSSCs) has been designed and fabricated using a porous carbon sheet as a conducting substrate and ordered mesoporous carbon (OMC) as the catalytic layer. A rigid, crustose lichen-like, integrated carbon-carbon composite architecture with a catalytic layer rooted in a porous conducting substrate was formed by a process of polymer precursor spin coating, infiltration and pyrolysis. The integrated pure carbon CE shows very low series resistance (Rs), owing to the high conductivity of the carbon sheet (sheet resistance of 488 mΩ □-1) and low charge-transfer resistance (Rct), due to the large specific surface area of the OMC layer that is accessible to the redox couple. The values of Rs and Rct are much lower than those of a platinized fluorine-doped thin oxide glass (Pt/FTO) electrode. Cells with this CE show high solar-to-electricity conversion efficiencies (8.11%), comparable to that of Pt/FTO based devices (8.16%). © the Owner Societies 2013.

    DOI: 10.1039/c3cp52525b

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  • TiC/Pt composite catalyst as counter electrode for dye-sensitized solar cells with long-term stability and high efficiency 査読有り

    Wu M., Wu M., Wang Y., Lin X., Guo W., Wu K., Lin Y., Guo H., Ma T.

    Journal of Materials Chemistry A   1 ( 34 )   9672 - 9679   2013年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Titanium carbide/platinum (TiC/Pt) composites were prepared by a simple chemical route and subsequently introduced into dye-sensitized solar cells (DSCs) as counter electrode (CE) catalysts to improve the catalytic activity and reduce the cost of DSCs. The DSC using TiC/Pt (containing 0.12 wt% of Pt) CE showed high power conversion efficiency (PCE) of 7.63%, higher than those of DSCs using TiC and Pt CEs (6.40% and 7.16%, respectively). After a long-term (one year) stability test, the PCE of the DSC using this CE retained 86.9% of its highest value, proving the outstanding durability of the TiC/Pt composite. In large-scale DSCs (55 mm × 75 mm), the DSC using TiC/Pt CE yielded a PCE of 4.98%, comparable to that of a DSC using Pt CE (4.94%). This work points out the feasibility of using TiC/Pt composite CEs in practical applications. © 2013 The Royal Society of Chemistry.

    DOI: 10.1039/c3ta12077e

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  • Highly efficient telluride electrocatalysts for use as Pt-free counter electrodes in dye-sensitized solar cells 査読有り

    Jiahao Guo, Yantao Shi*, Yuting Chu ,Tingli Ma*

    Chem. Commun   10 ( 1039 )   C3CC45698F   2013年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3cc45698f

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  • Economical, green and dual-function pyridyl iodides as electrolyte components for high efficiency dye-sensitized solar cells 査読有り

    Hong Zhang, Yantao Shi*, Liang Wang, Chaolei Wang, Huawei Zhou, Wei Guo ,Tingli Ma*

    Chem. Commun.   2013 ( 49 )   9003 - 9005   2013年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3cc44520h

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  • One-step synthesis of nano-scaled tungsten oxides and carbides for dye-sensitized solar cells as counter electrode catalysts 査読有り

    Wu M., Mu L., Wang Y., Lin Y., Guo H., Ma T.

    Journal of Materials Chemistry A   1 ( 25 )   7519 - 7524   2013年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Nano-scaled tungsten oxides and carbides are synthesized using a simple one-step chemical method. They are subsequently introduced into dye-sensitized solar cells (DSCs) as counter electrode (CE) catalysts to replace the expensive Pt. The catalytic mechanism is investigated by measurements of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel-polarization curve for the as-prepared catalysts. The DSCs using WC/W <inf>2</inf>C, W<inf>2</inf>C and WO<inf>2</inf> as CE catalysts yield high power conversion efficiency (PCE) of 6.23%, 6.68%, and 6.88%, respectively, comparable to that of the DSC using Pt CE. The results demonstrate that tungsten oxides and carbides are the potential alternative to the expensive Pt CE for reducing the cost of DSCs. © The Royal Society of Chemistry 2013.

    DOI: 10.1039/c3ta10628d

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  • Notable catalytic activity of oxygen-vacancy-rich WO2.72 nanorod bundles as counter electrodes for dye-sensitized solar cells 査読有り

    Huawei Zhou, Yantao Shi*, Liang Wang, Hong Zhang, Chunyu Zhao, Anders Hagfeldtb ,Tingli Ma

    Chem. Commun.   2013 ( 49 )   7626 - 7628   2013年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3cc44518f

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  • Effect of the compact Ti layer on the efficiency of dye-sensitized solar cells assembled using stainless steel sheets 査読有り

    Meng L., Meng L., Meng L., Wu M., Wang Y., Guo W., Ma C., Ma T., Silva R.

    Applied Surface Science   275   222 - 226   2013年06月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Titanium films have been deposited on stainless steel metal sheets using dc magnetron sputtering technique at different substrate temperatures. The structure of the titanium films strongly depend on the substrate temperature. The titanium film deposited at the substrate temperature lower than 300 °C has a loose flat sheet grains structure and the titanium film prepared at the substrate temperature higher than 500 °C has a dense nubby grains structure. The DSSC assembled using stainless steel sheet coated with titanium film deposited at high substrate temperature has a low charge transfer resistance in the TiO2/Ti interface and results in a high conversion efficiency. The DSSC assembled using stainless steel sheet coated with titanium film deposited at temperature higher than 500 °C has higher conversion efficiency than that assembled using titanium metal sheet as the substrate. The maximum conversion efficiency, 2.26% is obtained for DSSC assembled using stainless steel sheet coated with titanium film deposited at 700 °C substrate temperature, which is about 70% of the conversion efficiency of the FTO reference cell used in this study. © 2013 Elsevier B.V.

    DOI: 10.1016/j.apsusc.2012.12.157

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  • Effect of enhanced pyrolysis platinized processes on the performance of counter electrodes 査読有り

    Xin G., Wu L., Huang X., Wen B., Ma T.

    Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering   42 ( 6 )   1130 - 1133   2013年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    To improve the photoelectric conversion efficiency and reduce the cost of platinized electrodes of dye-sensitized solar cells (DSSCs), a systemic study was performed for preparing efficient platinized counter electrodes (CE) by the pyrolysis method, and an optimum process was obtained. Results indicate that the platinized CE using the optimizing pyrolysis achieves high photovoltaic efficiency close to that of the sputtering platinized electrodes, and this method may be used to economically prepare large-sized and high-performance platinum loaded CE. Copyright © 2013, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

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  • First Application of Bis(oxalate)borate Ionic Liquids (ILBOBs) in High- Performance Dye-sensitized Solar Cells 査読有り

    Liang Wang, Hong Zhang, Rile Ge, Chaolei Wang, Wei Guo, Yantao Shi, Yanan Gao* ,Ting Li Ma*

    RSC Adv.   2013 ( 3 )   12975 - 12980   2013年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ra41180j

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  • Highly Efficient and Low Cost Pt-based Binary and Ternary Composite Catalysts as Counter Electrode for Dye-Sensitized Solar Cells 査読有り

    Yudi Wang, Chunyu Zhao, Mngxing Wu, Wei Liu ,Tingli Ma*

    Electrochimica Acta   2013 ( 105 )   671 - 676   2013年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.electacta.2013.04.154

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  • Solid-State Synthesis of ZnO Nanostructures for Quasi-Solid Dye-Sensitized Solar Cells with High Efficiencies up to 6.46% 査読有り

    Yantao Shi*, Kai Wang , Yi Du , Hong Zhang , Junfu Gu , Chao Zhu , Lin Wang , Wei Guo , Anders Hagfeldt , Ning Wang , Tingli Ma

    Adv Mater.   2013 ( 25 )   4413 - 4419   2013年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/adma.201301852

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  • Ultrarapid Sonochemical Synthesis of ZnO Hierarchical Structures: From Fundamental Research to High Efficiencies up to 6.42% for Quasi-Solid Dye-Sensitized Solar Cells 査読有り

    Yantao Shi, Chao Zhu, Lin Wang, Chunyu Zhao, Wei Li, Kwok Kwong Fung, Tingli Ma*, Anders Hagfeldt, Ning Wang*

    Chemistry of Materials   2013 ( 26(6) )   1000 - 1012   2013年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/cm400220q

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  • Influence of the benzo[d]thiazole-derived π-bridges on the optical and photovoltaic performance of D-π-A dyes 査読有り

    Ci Z., Yu X., Bao M., Wang C., Ma T.

    Dyes and Pigments   96 ( 3 )   619 - 625   2013年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    New metal-free organic sensitizers containing a benzo[d]thiazole or phenyl unit as the π-conjugated system, a triphenylamine as an electron donor, and a cyanoacrylic acid moiety as an electron acceptor were synthesized and used for dye-sensitized solar cells. Photophysical and electrochemical properties of these dyes were investigated, and their performances as sensitizers in solar cells were measured. The introduction of a benzo[d]thiazole unit into the molecular structure resulted in a high incident photon-to-current conversion efficiency (more than 70%) from 340 nm to 600 nm. One solar cell containing a benzo[d]thiazole unit, produced a η of 5.85% (JSC = 10.63 mA cm-2, VOC = 0.72 V, and ff = 0.77) under 100 mW cm -2 simulated AM 1.5 G solar irradiation. © 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.dyepig.2012.11.004

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  • Preparation of FTO-free and coal based carbon counter electrodes for dye sensitized solar cells 査読有り

    Meng F., Wang C., Wu M., Lin X., Wang T., Ma T.

    Wuji Cailiao Xuebao/Journal of Inorganic Materials   28 ( 3 )   273 - 277   2013年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The coal-based carbon counter electrodes (CEs) with low-cost and high-performance were prepared from different coal powders such as gas coal, coking coal and lean coal, and they were used to substitute both conductive glass substrate and catalyst layer. The effects of impregnation and surface modification of the coal-based carbon CEs on their structure and photovoltaic performance were investigated. XRD, SEM and electrochemical impedance spectroscope were used to character the structure and performance of coal based carbon CEs. Results show that the coal based carbon CE after impregnated is the integrative CE with porous top surface and dense bottom. The solar cell with coal based carbon CE with surface modified demonstrates high photovoltaic performance with open circuit photo-voltage (Voc) of 0.79 V, short circuit photocurrent density (Jsc) of 13.48 mA/cm2, fill factor (FF) of 0.67, and solar-to-electricity conversion efficiency (η) of 7.16%, which is 30% higher than that of the cell with graphite electrode, and comparable to that of the cell with Pt electrode. The results indicate that the as-prepared coal based carbon CE is a promising CE candidate for substitute conventional Pt/FTO counter electrode.

    DOI: 10.3724/SP.J.1077.2013.12237

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  • Great improvement of catalytic activity of oxide counter electrodes fabricated in N<inf>2</inf> atmosphere for dye-sensitized solar cells 査読有り

    Wu M., Wu M., Lin X., Lin X., Guo W., Wang Y., Chu L., Ma T., Wu K.

    Chemical Communications   49 ( 11 )   1058 - 1060   2013年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The dye-sensitized solar cells (DSCs) using SnO2 and Nb 2O5 counter electrodes (CEs) prepared in N2 atmosphere yielded power conversion efficiencies (PCE) of 6.09% and 4.65%, much higher than the PCE values (1.84%, 0.97%) of the DSCs using the same SnO 2 and Nb2O5 CEs prepared in air. © 2013 The Royal Society of Chemistry.

    DOI: 10.1039/c2cc37360b

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  • A new type of lowcost counter electrode catalyst based on platinum nanoparticles loaded onto silicon carbide (Pt/SiC) for dye-sensitized solar cells. 査読有り

    Sining Yun*, Liang Wang, Chunyu Zhao, Yanxiang Wang ,Tingli Ma*

    Phys. Chem. Chem. Phys.   2013 ( 15 )   4286 - 4290   2013年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3cp44048f

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  • Synthesis and photoelectric properties of an organic dye containing benzo[1,2-b:4,5-b']dithiophene for dye-sensitized solar cells 査読有り

    Gao, Y.-R., Chu, L.-L., Guo, W., Ma, T.-L.

    Chinese Chemical Letters   24 ( 2 )   149 - 152   2013年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.cclet.2013.01.010

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  • Printable fabrication of Pt-and-ITO free counter electrode for all flexible quasi-solid dye-sensitized solar cells 査読有り

    Huawei Zhou, Yantao Shi*, Da Qin, Jiang An, Lingling Chu, Chaolei Wang, Yudi Wang, Wei Guo, Liang Wang ,Tingli Ma*

    J. Mater. Chem. A   2013 ( 1 )   3932 - 3237   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ta00960b

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  • Printable electrolytes for highly efficient quasi-solid-state dye-sensitized solar cells. 査読有り

    Chaolei Wang, Liang Wang, Yantao Shi, Hong Zhang ,Tingli Ma

    Electrochimica Acta,   2013 ( 91 )   302 - 306   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.electacta.2012.12.096

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  • A simple template synthesis of hierarchically mesoporous TiO<inf>2</inf> microsphere for dye-sensitized solar cells 査読有り

    Guo W., Wang K., Shen Y., Zhang H., Weng T., Ma T., Ma T.

    Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica   29 ( 1 )   82 - 88   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Mesoporous TiO2 microspheres were synthesized using a simple template method. The effect of the alkyl chain length on the synthesis and properties of the TiO2 microspheres was studied. A high power conversion efficiency (9.5%-10.1%) was attained by the dye-sensitized solar cells (DSCs) fabricated with the hierarchically mesoporous TiO2 microsphere films. The physical properties of the TiO2 microspheres were analyzed by X-ray diffraction (XRD), N2 physisorption (BET), and scanning electron microscopy (SEM). The results indicated the TiO2 microsphere crystal structure to be in the pure anatase phase; the rough surface microstructure of the TiO2 microspheres, formed through accumulation of nanocrystalline (14-18 nm diameter) TiO2 particles, provides a proper large surface area and mesoporous structure. The hierarchically mesoporous TiO2 microspheres can form good paths for mass transport, and also act as light scattering layers for efficient light harvesting. Meanwhile, the rough TiO2 microsphere surface ensures a sufficient amount of dye uptake, and consequently improves the photo-generated electron density. Electrochemical impedance analysis demonstrated the advantage of using microspheres for mass transport in electrolytes. © Editorial office of Acta Physico-Chimica Sinica.

    DOI: 10.3866/PKU.WHXB201211071

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  • Metal Oxide/Carbide/Carbon Nanocomposites: In Situ Synthesis, Characterization, Calculation and its Application as Efficient Counter Electrode Catalyst for Dye-Sensitized Solar Cells 査読有り

    Sining Yun*, Hong Zhang, Huihai Pu, Junhong Chen, Anders Hagfeldt , Tingli Ma

    Advanced Energy Materials   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/aenm.201300242

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  • Pt-like Behavior of High-Performance Counter Electrodes Prepared from Binary Tantalum Compounds Showing High Electrocatalytic Activity for Dye-Sensitized Solar Cells. 査読有り

    Dr. Sining Yun*, Mingxing Wu, Yudi Wang, Jing Shi, Xiao Lin, Anders Hagfeldt , Tingli Ma*

    ChemSusChem.   2013 ( 6 )   411 - 416   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/cssc.201200845

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  • Economical hafnium oxygen nitride binary/ternary nanocomposite counter electrode catalysts for high-efficiency dye-sensitized solar cells 査読有り

    Sining Yun*, Huawei Zhou, Liang Wang, Hong Zhang ,Tingli Ma*

    J. Mater. Chem. A,   2013 ( 1(4) )   1341 - 1348   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c2ta00680d

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  • Highly Stable Gel-State Dye-Sensitized Solar Cells Based on High Soluble Polyvinyl Acetate 査読有り

    Liang Wang, Hong Zhang, Chaolei Wang ,Tingli Ma*

    ACS Sustainable Chem   2013 ( 1(2) )   205 - 208   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/sc300153b

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  • Cost-effective and morphology-controllable niobium diselenides for highly efficient counter electrodes of dye-sensitized solar cells 査読有り

    Jiahao Guo, Yantao Shi*, Chao Zhu, Lin Wang, Ning Wang ,Tingli Ma*

    J. Mater. Chem. A   2013 ( 1 )   11874   2013年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c3ta12349a

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  • Highly efficient dye-sensitized solar cells based on N-doped titania electrodes 査読有り

    Shen Y., Guo W., Ma T.

    Taiyangneng Xuebao/Acta Energiae Solaris Sinica   33 ( 12 )   2050 - 2055   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Three kinds of N-doped titania (TiO2-xNx) were synthesized by wet methods using ammonia, urea, and triethylamine as nitrogen sources, respectively. The effect of different nitrogen sources on the properties of TiO2-xNx powder and film were investigated in detail. These results show that all three TiO2-xNx are pure phase of anatase. New absorption peaks from 400 nm to 550 nm in visible light region were observed in UV-Vis spectra. Surface area and nitrogen doping amount varied with doping methods. The three kinds of TiO2-xNx electrodes were introduced into dye-sensitized solar cells. TiO2-xNx using ammonia as nitrogen sources exhibits the highest efficiency of 8.32%. Comparing with pure TiO2 and commercial P25 electrodes, 17% and 44% improvement in efficiency were realized in dye-sensitized TiO2-xNx solar cells. The mechanism of electron transport time and electron lifetime of TiO2-xNx and pure TiO2 was studied. The results indicate that synergistic effect of fast electron transport and high dye uptake contributes to high photovoltaic performance.

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  • Enhanced Photoconversion Efficiency of All-Flexible Dye-Sensitized Solar Cells Based on a Ti Substrate with TiO2 Nanoforest Underlayer 査読有り

    Jiang An, Wei Guo ,Tingli Ma

    Wiley Interscience   2012 ( 8 )   3427 - 3431   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/smll.201200802

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  • Non-Pt counter electrode catalysts using tantalum oxide for low-cost dye-sensitized solar cells 査読有り

    Yun S., Wang L., Guo W., Ma T.

    Electrochemistry Communications   24 ( 1 )   69 - 73   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The Pt-like electrocatalytic activity of counter electrodes (CEs) prepared from tantalum oxides for dye-sensitized solar cells (DSCs) is demonstrated. The low ratio of oxygen to metal atom of the oxide favors the electrocatalytic activity of these CE materials for I 3- reduction in DSCs. TaO, used as a CE in DSCs, shows superior electrocatalytic activity and a high power conversion efficiency of 6.48%, up to 90.5% of the level obtained using Pt as a CE (7.16%). This work develops the use of novel tantalum oxide CE materials for low cost and high efficiency DSCs. © 2012 Elsevier B.V.

    DOI: 10.1016/j.elecom.2012.08.008

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  • An Autocatalytic Factor in the Loss of Efficiency in Dye-Sensitized Solar Cells 査読有り

    Jiang An, Wei Guo ,Tingli Ma

    Wiley Interscience ChemCatChem   2012 ( 4 )   1255 - 1258   2012年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1002/cctc.201200061

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  • Pt-free Catalysts Used as Counter Electrodes in Dye-sensitized Solar Cells 査読有り

    Mingxing Wu ,Tingli Ma

    Wiley Interscience ChemSusChem,   2012 ( DOI: 10.1002 )   2012年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    This Minireview summarizes the development of platinum-free catalysts for use as counter electrodes in dye-sensitized solar cells. These catalysts comprise various metals, carbon materials, conductive polymers, and inorganic materials (transition metal carbides, nitrides, oxides, sulfides, and phosphides). The research work reported so far highlights the importance of a proper match between counter electrode catalyst and redox couple.

  • Improvement of adhesion of Pt-free counter electrodes for low-cost dye-sensitized solar cells 査読有り

    Yurong Gao, Lingling Chu, Mingxing Wu, Linlin Wang, Wei Guo ,Tingli Ma

    Elseviser Science Journal of Photochemistry and Photobiology A:Chemistry.   2012 ( 245 )   66 - 71   2012年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We fabricated low-cost carbon and carbides counterelectrodes (CEs) with excellent adhesion by adding an industrial conductive carbon paste (CC) as a binder for dye-sensitizedsolarcells (DSSCs). We compared the electrochemical catalytic activity of CC and carbon dye (Cd)/CC in the reduction of triiodide to iodide using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).

    DOI: 10.1016/j.jphotochem.2012.07.005

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  • Optimization of the Performance of Dye-Sensitized Solar Cells Based on Pt-Like TiC Counter Electrodes 査読有り

    Yudi Wang, Mingxing Wu, Xiao Lin, Anders Hagfeldt ,Tingli Ma

    Wiley Interscience European Journal of Inorganic Chemistry   2012 ( 22 )   3557 - 3561   2012年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Titanium carbide (TiC) has been used as a counter electrode (CE) catalyst in place of Pt for triiodide reduction in dye-sensitized solar cells (DSCs). Its catalytic activity can be comparable to that of Pt. The effect of the thickness of the TiC layer on the performance of the DSCs was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and Tafel polarization measurements.

    DOI: 10.1002/ejic.201200329

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  • Fabrication and Application of a Carbon Counter Electrode with Excellent Adhesion Properties for Dye-Sensitized Solar Cells 査読有り

    CHU Ling-Ling, GAO Yu-Rong, WU Ming-Xing, WANG Lin-Lin ,MA Ting-Li

    Chinese Chemical Society Acta Phys. Chim. Sin   2012 ( 28(07) )   1739 - 1744   2012年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    investigating the influence of CC on the performance of DSSCs, we also chose several transition metal carbides, including molybdenum carbide (MoC), tungsten carbide (WC), ordered mesoporous carbon (OMC), MoC embedded in OMC (MoC-OMC), and WC embedded in OMC (WC-OMC) as catalytic materials of CEs. DSSCs based on the carbon and carbides CEs reached efficiencies of 4.50–6.81%.

    DOI: 10.3866/PKU.WHXB201204232

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  • SnS-Quantum Dot Solar Cells Using Novel TiC Counter Electrode and Organic Redox Couples 査読有り

    Wei Guo, Yihua Shen, Mingxing Wu, LinLin Wang ,Tingli Ma

    Wiley Interscience Chemistry - A European Journal.   2012 ( 18 )   7862 - 7868   2012年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Low-cost quantum-dot sensitized solar cells (QDSSCs) were fabricated by using the earth-abundant element SnS quantum dot, novel TiC counter electrodes, and the organic disulfide/thiolate (T2/T−) redox couple, and reached an efficiency of 1.03 %. QDSSCs based on I−/I3−, T2/T−, and S2−/Sx2− redox couples were assembled to study the role of the redox couples in the regeneration of sensitizers. Charge-extraction results reveal the reasons for the difference in JSC in three QDSSCs based on I−/I3−, T2/T−, and S2−/Sx2− redox couples.

    DOI: 10.1002/chem.201103904

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  • Transparent Flexible Pt Counter Electrodes for High Performance Dye-Sensitized Solar Cells 査読有り

    Yudi Wang,Chunyu Zhao, Mingxing Wu,Wei Liu ,Tingli Ma

    Royal Society of Chemistry   2012 ( 22 )   22155 - 22159   2012年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A transparent flexible Pt counter electrode (CE) was prepared on indium tin oxide–polyethylene naphthalate film using a simple dip coating method for dye-sensitized solar cells (DSCs), and a high catalytic activity was achieved. The DSC using this transparent flexible CE gave a power conversion efficiency (PCE) of 6.95% with front illumination, and a PCE of 5.18% with rear illumination.

    DOI: 10.1039/c2jm35348b

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  • Highly efficient inorganic–organic heterojunction solar cells based on SnS-sensitized spherical TiO2 electrodes 査読有り

    Wei Guo, and Tingli Ma*

    Chem. Commun.   ( 48 )   6133 - 6135   2012年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1039/c2cc31903a

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  • Study of influencing factors for performance of large-scale dye-sensitized solar cells based on the semi-empirical model 査読有り

    Wu B., Wang L., Wang Y., Ma T.

    Wuli Xuebao/Acta Physica Sinica   61 ( 7 )   2012年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Based on some physical and geometric parameters, the influence of internal resistance on the cell performance is analyzed and a semi-empirical mathematical model of the efficiency is built for some configurations of large-scale dye-sensitized solar cells. Three configurations of large-scale cells are investigated, in which the independent units are connected in series and in parallel, as well as in series-parallel. The efficiencies of the three-type large-scale cells are calculated according to their physical and geometric parameters. The applicability of the model is analyzed by comparing the calculated efficiencies with the measured ones. The influences of the physical and geometric parameters on the cell performance are investigated based on the semi-empirical mathematical model. It is found that the optimization of the performance of large-scale cells can be carried by analyzing the influences of physical and geometric parameters using the semi-empirical mathematical model. © 2012 Chinese Physical Society.

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  • Highly efficient inorganic–organic heterojunction solar cells based on SnS-sensitized spherical TiO2 electrodes 査読有り

    Wei Guo, Yihua Shen, Mingxing Wu , Tingli Ma

    Royal Society of Chemistry; Chem. Commun   2012 ( 48 )   6133 - 6135   2012年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    All-solid-state inorganic–organic heterojunction solar cells (HSCs) were designed and fabricated using earth-abundant All-solid-state inorganic–organic heterojunction solar cells (HSCs) were designed and fabricated using earth-abundant

  • High-perform-ance phosphide/carbon counter electrode for both iodide and organic redox couples in dye-sensitized solar cells 査読有り

    Mingxing Wu, Jin Bai, Yudi Wang, Anjie Wang, Xiao Lin, Anders Hagfeldt ,Tingli Ma

    Royal Society of Chemistry; J. Mater. Chem.   2012 ( 22 )   11121 - 11127   2012年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    In the present study, molybdenum phosphide (MoP), nickel phosphide (Ni5P4), and carbon-supported Ni5P4 (Ni5P4/C) were proposed for use as counter electrode (CE) catalysts in dye-sensitized solar cells (DSCs) for the regeneration of both the conventional I3−/I− redox couple and a new organic T2/T− redox couple. For the I3−/I− redox couple, the DSCs using MoP and Ni5P4 CE yielded a power conversion efficiency (PCE) of 4.92 and 5.71%, and the DSC using Ni5P4/C showed a high PCE of 7.54%, which was close to that of the DSC using Pt CE (7.76%).

    DOI: 10.1039/c2jm30832k

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  • Economical Pt-Free Catalysts for Counter Electrodes of Dye-Sensitized Solar Cells 査読有り

    Mingxing Wu, Xiao Lin and Tingli Ma

    American Chemical Society   ( 134 )   3419 - 3428   2012年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1021/ja209657v

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  • Platinum-free catalysts as counter electrodes in dye-sensitized solar cells 査読有り

    Wu M., Ma T.

    ChemSusChem   5 ( 8 )   1343 - 1357   2012年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Sun sans Pt: This Minireview summarizes the development of platinum-free catalysts for use as counter electrodes in dye-sensitized solar cells. These catalysts comprise various metals, carbon materials, conductive polymers, and inorganic materials (transition metal carbides, nitrides, oxides, sulfides, and phosphides). The research work reported so far highlights the importance of a proper match between counter electrode catalyst and redox couple. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/cssc.201100676

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  • Several Highly Efficient Catalysts for Pt-free and FTO-free Counter Electrodes of Dye-Sensitized Solar Cells 査読有り

    Yudi Wang, Mingxing Wu, Xiao Lin ,Tingli Ma

    Royal Society of Chemistry; J. Mater. Chem.   2012 ( 22 )   4009 - 4014   2012年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Three nanomaterials, namely, titanium carbide (TiC), tungsten oxide (WO2), and vanadium nitride (VN), are introduced into dye-sensitized solar cells (DSCs) as counter electrode (CE) catalysts to replace the expensive Pt CE. Three kinds of substrates of bare glass (BG), Ti foil, and polyimide (PI) film are applied as F-doped tin oxide (FTO)-free substrates for rigid and flexible DSCs; thus realizing FTO-free and Pt-free CEs simultaneously in the DSC system. A carbon layer is used as an electron collector to replace the expensive FTO conductive layer in the insulative BG and PI film. Cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization curves are performed to compare the catalytic activities of these CEs for the reduction of triiodide to iodide.

    DOI: 10.1039/c2jm15182k

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  • Highly efficient catalysts for Co(II/III) redox couples in dye-sensitized solar cells 査読有り

    Liang Wang , Eric Wei-Guang Diau , Mingxing Wu , Hsueh-Pei Lu ,Tingli Ma

    Royal Society of Chemistry; Chem. Commun.   2012 ( 48 )   2600 - 2602   2012年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We developed several low-cost catalysts with high catalytic activity, which were used as counter electrodes in dye-sensitized solar cells (DSCs). They showed higher efficiencies than that of Pt. The efficiencies were improved by 18–42% for the DSCs composed of active carbon, niobium dioxide, ordered mesoporous carbon and commercial titanium carbide.

    DOI: 10.1039/c2cc17389a

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  • Tandem dye-sensitized solar cells 査読有り

    Miao Q., Gao Y., Ma T.

    Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices   17 ( 6 )   611 - 619   2011年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell (DSC) is considered as the third generation photovoltaic cell. To commercialize DSCs successfully, it is necessary to further improve the efficiency. One of the effective methods is improving the utilization ratio of the solar light and broadening the absorption spectra of the cell. Tandem dye-sensitized solar cells (TDSC) have attracted much attention due to their novel structure and particular characteristics. In this review, the research background and the recent progress of TDSC at home and abroad are summarized. The traditional TDSC, N-P type TDSC, hybrid DSC and the tandem cells based on the other type solar cell and DSC are introduced in detail. The recent progress and the existent problems are discussed. Furthermore, the structures, characteristics and efficiencies of every type tandem solar cells are analyzed. At last, the development tendency and promising prospects of TDSC are presented.

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  • Recent Progress on Bulk Heterojunction Polymer Solar Cells 査読有り

    Gao Yurong ,Ma Tingli

    Chinese Chemical Society Progress in Chemistry,   2011 ( 23 )   991 - 1013   2011年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Polymer solar cell has attracted considerable attention due to its advantages, such as light weight of device, simple process of production, and low-cost fabrication process. In this paper, we review the recent progress of the BHJ-PSC. First, we introduce the device structure and the work principle of the BHJ-PSC with the focus on the progress of donor and acceptor material.

  • Optimization of the photoelectric performance of large-scale all-flexible dye-sensitized solar cells 査読有り

    Lin X., Wu M., An J., Miao Q., Qin D., Ma T.

    Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica   27 ( 11 )   2577 - 2582   2011年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Highly efficient large scale flexible dye-sensitized solar cells (DSCs) were successfully designed and fabricated. By the introduction of a light scattering layer or pressure, the DSC efficiency was greatly improved. The flexible DSCs with a small surface area (0.4 cm × 0.4 cm) gave a high energy conversion efficiency of 5.50%. The energy conversion efficiencies of large area DSCs (2 cm×3 cm, active area of 2.7 cm2) improved from 1.52% to 1.81% and 2.50%, which is an increase of 20.0% and 66.7% compared with the DSCs prepared without any treatment. The 5 cm×7 cm DSCs (active area of 16.2 cm2) without any optimization showed an energy conversion efficiency of 1.60% under a sunlight intensity of 40 mW·cm-2. The mechanism for the improvement in efficiency was also studied. The results of electrochemical impedance spectroscopy (EIS) demonstrated that the pressure method can significantly reduce the series resistance (Rs) and the charge transfer resistance (Rct) in the TiO2/dye/electrolyte interface. Scanning electron microscopy (SEM) showed that the TiO2 particles were far more closely connected after pressing, which was helpful for electron transport in the TiO2 network as well as for dye adsorption. In addition, the photovoltaic parameters of these flexible DSCs were found to be stable after the 900 h stability tests. The experimental results obtained for these flexible DSCs can be used as a foundation for further basic research and for industrialization technical research. © Editorial office of Acta Physico-Chimica Sinica.

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  • The new type of hybrid and tandem dye-sensitized solar cells 査読有り

    Miao Q., Gao J., Wang Z., Gao Y., Ma T.

    Acta Chimica Sinica   69 ( 19 )   2207 - 2214   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell (DSC) is a new type of photovoltaic cell. To further improve the energy conversion efficiency of DSCs, one method is broadening the absorption spectra and improving the utilization ratio of light. In this paper, three types of tandem DSCs and a new type of hybrid DSC prepared by a film-transfer technique were investigated. The superposition character of tandem DSCs and the influencing factors of the efficiencies of the top and bottom cells in different structure were systematically studied. Then, we investigated the superposition character of hybrid DSC and the mechanism on VOC. The results show that the hybrid structure can achieve a panchromatic response. The superposition of IPCE and JSC were confirmed. The high efficiency of 11.05% was achieved. The high VOC of hybrid DSC was correlated to the different degree of back reactions at the TiO2/dye/electrolyte interface. The highest efficiency of hybrid DSC was achieved when compared with tandem DSC and co-sensitized DSC under the same conditions.

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  • Economical and effective sulfide catalysts for dye-sensitized solar cells as counter electrodes 査読有り

    Mingxing Wu, Yudi Wang, Xiao Lin ,Tingli Ma

    Royal Society of Chemistry; Physical Chemistry Chemical Physics   2011 ( 13 )   19298 - 19301   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Molybdenum sulfide (MoS2) and tungsten sulfide (WS2) are proposed as counter electrode (CE) catalysts in a I3_/I_ and T2/T_ based dye-sensitized solar cells (DSCs) system. The I3_/I_ based DSCs usingMoS2 andWS2 CEs achieved power conversion efficiencies of 7.59% and 7.73%, respectively.

    DOI: 10.1039/c1cp22819f

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  • In situ Synthesized Economical Tungsten Dioxide imbedded in Mesoporous Carbon for Dye-sensitized Solar Cells as Counter Electrode Catalyst 査読有り

    Mingxing Wu, Xiao Lin, Liang Wang, Wei Guo, Yudi Wang, Jinqiu Xiao ,Tingli Ma

    American Chemical Society J Phys Chem C   2011 ( DOI:10.1021 )   2011年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Tungsten dioxide imbedded in mesoporous carbon (WO2_MC) was obtained by in situ synthesis and then introduced into dyesensitized solar cells (DSCs) as a counter electrode (CE) catalyst. Catalytic activity for redox couple regeneration was improved significantly through combining high electrical conductivity and catalytic activity into one material, WO2_MC.

    DOI: 10.1021/jp205886d

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  • Effect of N Dopant Amount on the Performance of Dye-Sensitized Solar Cells Based on N-Doped TiO2 Electrodes 査読有り

    Wei Guo, Yihua Shen, Liqiong Wu, Yurong Gao ,Tingli Ma

    American Chemical Society J Phys Chem C   2011 ( 115 )   21494 - 21499   2011年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We investigated the effect of varying amounts of N dopant on the performance of dye-sensitized solar cells (DSCs) based on the N-doped TiO2 electrodes. An interesting hierarchically macro-/mesoporous N-doped TiO2 structure with parallel macro-channels was formed by a simple template-free wet method. A series of N-doped TiO2 electrodes with varying N dopant amounts were fabricated for the DSCs.

    DOI: 10.1021/jp2057496

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  • Novel counter electrode catalysts of niobium oxides supersede Pt for dye-sensitized solar cells. 査読有り

    Xiao Lin, Mingxing Wu, Yudi Wang ,Tingli Ma

    Royal Society of Chemistry; Chem. Commun   2011 ( 147 )   11489 - 1149   2011年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Synthesized niobium oxides (Nb2O5 and NbO2) were applied for the first time as counter electrodes (CEs) in dye-sensitized solar cells (DSCs). The DSC using NbO2 CE showed a higher power conversion efficiency of 7.88%, compared with that of the DSC using Pt CE (7.65%).

    DOI: 10.1039/c1cc14973c

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  • Effect of annealing temperature on the hydrogen production of TiO <inf>2</inf> nanotube arrays in a two-compartment photoelectrochemical cell 査読有り

    Sun Y., Yan K., Wang G., Guo W., Ma T.

    Journal of Physical Chemistry C   115 ( 26 )   12844 - 12849   2011年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Due to the energy crisis, it is necessary to develop clean and renewable energy sources. In this study, we report an efficient and economical technology to produce hydrogen from solar energy by splitting water in a two-compartment photoelectrochemical (PEC) cell without any external applied voltage. To enhance the solar conversion efficiency, highly ordered TiO2 nanotube arrays with 4 μm in length were synthesized by a rapid anodization process in ethylene glycol electrolyte. Crystal phase and morphology of the TiO2 nanotubes (NTs) samples annealed at various temperatures were characterized by XRD and FESEM. Transient photocurrent response and linear sweep voltammetry curves were measured using electrochemical working station under solar light illumination. The photocatalytic activity was evaluated by the hydrogen production in the PEC cell. The results indicated that the crystal phase and morphology of TiO2 NTs had no great changes at low annealing temperatures. Anatase phase and tubular structure of TiO2 NTs were stable up to 450 °C. With further increase in temperature, the crystallization transformation from anatase to rutile phase appeared, accompanied by the destruction of tubular structures. Due to the excellent crystallization and the maintenance of tubular structures, TiO2 NTs annealed at 450 °C exhibited the highest photoconversion efficiency of 4.49% and maximum hydrogen production rate of 122 μmol/(h·cm2), which is superior to most of those reported so far. © 2011 American Chemical Society.

    DOI: 10.1021/jp1116118

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  • A New Type of Dye-sensitized Solar Cells with a Multilayered Photoanode Prepared by a Film-transfer Technique,. 査読有り

    Miao Qing qing ,Tingli Ma

    Wiley Interscience Adv. Mater.   2011 ( 23 )   2764 - 2768   2011年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    we have successively fabricated the DSCs with multilayered photoanodes by the fi lm-transfer technique.The IPCE of DSCs based on the visible and NIR dyes demonstrated that the multilayered structure can achieve a panchromatic response. The superposition of J SC for multilayered DSCs was obtained by using two complementary dyes, AP and ZnPc. The conversion effi ciency was improved by 37.6%, 21.0%, and 12.1% compared with tandem DSC and co-sensitized DSC by using mixture and layered adsorption methods under similar conditions.

    DOI: 10.1002/adma.201100820

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  • Highly efficient Dye-sensitized Solar Cells based on N-doped TiO2 Electrodes. 査読有り

    Wei Guo, Qingqing Miao, Gang Xin, Liqiong Wu, Tingli Ma

    Elseviser Science Acta Energiae Solaris Sinica. Accepted   2011 ( 219 )   180 - 187   2011年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Three kinds of N-doped titania (TiO2-xNx) were synthesized by wet methods using ammonia, urea, and triethylamine as nitrogen sources, respectively. The effect of different nitrogen sources on the properties of TiO2-xNx powder and film were investigated in detail. These results show that all three TiO2-xNx are pure phase of anatase. Comparing with pure TiO2 and commercial P25 electrodes, a 17% and 44% improvement in efficiency was realized in dye-sensitized TiO2-xNx solar cells.

  • Two flexible counter electrodes based on molybdenum and tungsten nitrides for dye-sensitized solar cells 査読有り

    Mingxing Wu,Qingyu Zhang,Chunyu Ma ,Tingli Ma

    Royal Society of Chemistry; J. Mater. Chem.   2011 ( 21 )   10761 - 10766   2011年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Two novel flexible counter electrodes (CEs) on Ti sheets using molybdenum and tungsten nitrides (Mo2N, W2N) as catalysts were synthesized and used in a dye-sensitized solar cell (DSC) system. High catalytic activity of the two nitride CEs for the reduction of triiodide were proved.

    DOI: 10.1039/c1jm11422k

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  • Bulk heterojunction polymer solar cells 査読有り

    Gao Y., Ma T.

    Progress in Chemistry   23 ( 5 )   991 - 1013   2011年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Polymer solar cell has attracted considerable attention due to its advantages, such as light weight of device, simple process of production, and low-cost fabrication process. Bulk heterojunction polymer solar cell (BHJ-PSC) is one of the device with excellent performance. In this paper, we review the recent progress of the BHJ-PSC. First, we introduce the device structure and the work principle of the BHJ-PSC with the focus on the progress of donor and acceptor material. Furthermore, we discuss several important factors for effecting morphology of the active layer, such as solvents, additives, ratio of donor and accepter, and annealing condition. In addition, tandem cell and inverted cell are also introduced. Finally, the solutions to improve performance of the BHJ-PSC and the application prospects of the BHJ-PSC are presented.

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  • Synthesis, structure and physicochemical properties of a saddle-distorted porphyrin with a peripheral carboxyl group 査読有り

    Sankar M., Ishizuka T., Wang Z., Ma T., Shiro M., Kojima T.

    Journal of Porphyrins and Phthalocyanines   15 ( 5-6 )   421 - 432   2011年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A saddle-distorted porphyrin bearing a carboxyl group as a hydrogen-bonding site on a meso-phenyl group was synthesized and characterized. A supramolecular structure with intermolecular hydrogen bonding was revealed by X-ray diffraction analysis. The effects of the peripheral carboxyl group on the physicochemical properties of the porphyrin as well as on self-assembly were investigated by spectroscopic measurements in solutions. The redox properties of the porphyrin and its Zn(II) complex were also studied by electrochemical measurements and their application to dye-sensitized solar cells was examined. © 2011 World Scientific Publishing Company.

    DOI: 10.1142/S1088424611003379

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  • Low-cost dye-sensitized solar cell based on nine kinds of carbon counter electrodes, 査読有り

    Mingxing Wu, Xiao Lin and Tingli Ma

    Royal Society of Chemistry;Energy Environ. Sci.   2011 ( 4 )   2308 - 2315   2011年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Nine kinds of carbon materials were introduced into dye-sensitized solar cells (DSCs) system as counter electrodes (CEs). We also compared the electrochemical catalytic activity of these carbon materials with Pt for the reduction of triiodide to iodide

    DOI: 10.1039/c1ee01059j

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  • Highly catalytic counter electrodes for organic redox couple of thiolate/disulfide in dye-sensitized solar cells 査読有り

    Liang Wang,Mingxing Wu,Yurong Gao ,Tingli Ma

    American Institute of Physics Appl. Phys. Lett   2011   2011年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We synthesized a low-cost, highly catalytic tungsten carbide that was embedded in ordered mesoporous carbon WC-OMC. This was used as a counter electrode CE in dye-sensitized solar cells _DSCs_. For comparison, we also evaluated the catalytic activity of bare WC, and several normal carbon materials for the organic redox couple of thiolate/disulfide.

    DOI: 10.1063/1.3595684

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  • Low-Cost Molybdenum Carbide and Tungsten Carbide Counter Electrodes for Dye-Sensitized Solar Cells 査読有り

    Mingxing Wu, Xiao Lin and Tingli Ma*

    Angew. Chem. Int. Ed   2011 ( 50 )   3520 - 3524   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • Low-cost molybdenum carbide and tungsten carbide counter electrodes for dye-sensitized solar cells 査読有り

    Wu M., Lin X., Hagfeldt A., Ma T.

    Angewandte Chemie - International Edition   50 ( 15 )   3520 - 3524   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Sunny prospects for renewable energy: Molybdenum and tungsten carbides embedded in ordered nanomesoporous carbon materials as well as Mo2C and WC are proposed as alternatives to the expensive platinum counter electrode (Pt CE). The preparation of the CEs was optimized, and the dye-sensitized solar cells (DSCs; see picture) equipped with these CEs show a higher energy conversion efficiency than those devices with a Pt CE. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/anie.201006635

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  • Effects of hydroxyl group numbers of coadsorbents on photovoltaic performances of dye-sensitized solar cells 査読有り

    Lin H., Liu Y., Liu C., Li X., Shen H., Zhang J., Ma T., Li J.

    Journal of Electroanalytical Chemistry   653 ( 1-2 )   81 - 85   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Surface treatment of ruthenium dye (Bu4N)2[Ru(dcbpyH) 2(NCS)2]-sensitized TiO2 films using diethyl 4-methylphenylphosphonate as a coadsorbent results in large improvements in DSC performance, 24% larger overall conversion efficiency and 55 mV higher open-circuit voltage without current penalty. Introducing another two coadsorbents ethyl 4-methylphenylphosphonate and 4-methoxyphenylphosphonic acid brings in negative effects. Analysis by impedance spectroscopy indicated that this was attributed to different numbers of proton-releasing hydroxyl groups of the coadsorbents and consequently different proton-adsorbing chemical environments on the surface of TiO2 photoanodes. © 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jelechem.2010.12.025

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  • Performance of Dye-sensitized Solar Cells Based on MWCNTs/TiO2-xNx Nanocomposite Electrodes 査読有り

    Wei Guo, Yihua Shen, Liqiong Wu, Yurong Gao , Tingli Ma

    Wiley Interscience Eur.J Inorg. Chem   2011   1776 - 1783   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The effect of MWCNTs on the photovoltaic performance of the DSCs was studied in detail.
    A high energy conversion efficiency of 7.66% was achieved in the dye-sensitized MWCNT/TiO2 nanocomposites solar cells.

    DOI: 10.1002/ejic.201001241

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  • Dye-sensitized solar cells using 20 natural dyes as sensitizers 査読有り

    Huizhi Zhou,Tingli Ma

    Elseviser Science J Photochem Photobiol A: Chem,   2011 ( 219 )   188 - 194   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Twenty natural dyes, extracted from natural materials such as flowers, leaves, fruits, traditional Chinese medicines, and beverages, were used as sensitizers to fabricate dye-sensitized solar cells (DSCs). The photo-to-electric conversion efficiency of the DSC sensitized by the ethanol extract of mangosteen pericarp without purification reached 1.17%.

    DOI: 10.1016/j.jphotochem.2011.02.008

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  • Highly Efficient Dye-Sensitized Solar Cells Based on Nitrogen-Doped Titania with Excellent Stability 査読有り

    Wei Guo, Liqiong Wu, Zhuo Chen ,Tingli Ma

    Elseviser Science J Photochem Photobiol A: Chem,   2011 ( 219 )   180 - 187   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A series of nitrogen-doped and undoped TiO2 nanocrystals was prepared by several simple methods.Needle-like N-doped TiO2 nanocrystals and nanoparticles were obtained from commercial TiO2 powders. Several dye-sensitized solar cells (DSCs) were fabricated based on N-doped and undoped TiO2 electrodes. The N-doped DSCs achieved a high conversion efficiency of 10.1% and 4.8% using an organic electrolyte and an ionic liquid electrolyte,respectively.

    DOI: 10.1016/j.jphotochem.2011.01.004

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  • Influence of Nitrogen Dopants on N-doped TiO2 Electrodes and Their Applications in Dye-sensitized Solar Cells 査読有り

    Wei Guo, Yihua Shen ,Tingli Ma

    Elseviser Science Electrochim Acta   2011 ( 56 )   4611 - 4617   2011年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Three different types of nanocrystalline, N-doped TiO2 electrodes were synthesized using several nitrogen dopants through wet methods. The obtained nanocrystalline, N-doped TiO2 electrodes possessed different crystallite sizes, surface areas, and N-doping amounts. Characterizations were performed

    DOI: 10.1016/j.electacta.2011.02.091

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  • Studies of high-efficient and low-cost dye-sensitized solar cells 査読有り

    Qingqing Miao ,Tingli Ma

    Chinese Chemical Society  Frontiers of Optoelectronics in China,   2011 ( 4 )   103 - 107   2011年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell (DSSC) is a new type of photoelectric device. To commercialize DSSC successfully, it is necessary to further improve the efficiency of energy conversion and reduce its cost. Nitrogen-doped (N-doped) TiO2 photoanode, the carbon counter electrode (CE), and a new type of hybrid photoanode were investigated in this study.

    DOI: 10.1007/s12200-011-0201-6

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  • A novel catalyst of WO2 nanorod for the counter electrode of dye-sensitized solar cells 査読有り

    Mingxing Wu, Xiao Lin, Tingli Ma

    Royal Society of Chemistry; Chem. Commun.   2011 ( 47 )   4535 - 4537   2011年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Tungsten dioxide (WO2) nanorods were synthesized, which showed excellent catalytic activity for the reduction of triiodide to iodide. The dye-sensitized solar cell (DSC) using WO2 as a counter electrode (CE) reached a high energy conversion efficiency of 7.25%, which can match the performance of the DSC based on a Pt CE.

    DOI: 10.1039/c1cc10638d

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  • Fabrication and characterization of dye-sensitized solar cell with different microstructure ZnO 査読有り

    Wang Y., Ma T., Fan X., Li X.

    Materials Science Forum   663-665   857 - 860   2011年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    In order to improve the performance of the dye-sensitized solar cells based on ZnO films, ZnO nanoparticles of different size and morphology were prepared by hydrothermal and solvothermal synthesis methods. Electrodes applied to dye-sensitized solar cell were prepared by the screen-printing method. The effects of ZnO nanoparticles of different size and morphology on the photovoltaic characteristics of dye-sensitized ZnO solar cells were investigated. The results show that: The short-circuit current density and the energy conversion efficiency of the ZnO nanosheets DSSC are 0.13 mA/cm 2 and 0.02%. The short-circuit current density and the energy conversion efficiency of cells prepared with ZnO nanorods with diameter 500nm and length 5μm are 1.91 mA/cm2 and 0.03%.The best performance achieved in the present work was a conversion efficiency of 3.46% for the cells prepared with ZnO nanoparticles with diameters 80nm. © (2011) Trans Tech Publications.

    DOI: 10.4028/www.scientific.net/MSF.663-665.857

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  • Synthesis of TiO<inf>2</inf> nanopowders and their applications in dye-sensitized solar cell 査読有り

    Sun J., Wang Y., Xu M., Ma T., Fan X.

    Materials Science Forum   663-665   848 - 851   2011年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Dye-sensitized solar cells (DSSC) are currently attracting widespread interest for the conversion of sunlight into electricity because of their low cost and high efficiency. In these cells, photo-anode is one of the key components for high power conversion efficiencies. In this paper, TiO 2 nanopowders were prepared by the non-hydrolytic sol-gel method using TiCl4 as precursor, absolute ethanol and isopropanol as oxygen donor. Several different TiO2 nanopowders were used to fabricate TiO2 solar cells, and properties of TiO2 solar cells were characterized. The solar cell prepared with grainsize 50∼80nm TiO 2 nanopowders generated a short-circuit photocurrent of 13.17 mA/cm2, an open-circuit photovoltage of 789 mV, a fill factor of 69.8% and the efficiency of 7.25% under the light intensity of 100 mW/cm 2. © (2011) Trans Tech Publications.

    DOI: 10.4028/www.scientific.net/MSF.663-665.848

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  • Study of SrTiO 3 prepared by molten salt synthesis process for water splitting 査読有り

    Xin G., Guo W., Ma T.

    Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology   51 ( 1 )   20 - 24   2011年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The five photocatalysts of SrTiO 3 were prepared by molten salt synthesis (MSS) process and solid state reaction (SSR) process. The properties of the obtained samples were characterized by X-ray diffraction, BET and scanning electron microscope. The samples obtained by the MSS process showed the cubic particles. NiO x as a co-catalyst was coated on the surface of SrTiO 3 by an impregnated process, and the photocatalysis reactions for water splitting were evaluated with the NiO x-SrTiO 3 catalyst. The experimental results show that the photocatalysis reactivity of SrTiO 3 is influenced obviously by the synthesis process. And the reactivity of SrTiO 3 prepared by MSS process with NaCl is better than that of SSR process. The water can be split into hydrogen and oxygen effectively.

    Scopus

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  • Dye-sensitized Solar Cells Based on Nitrogen-doped Titania Electrodes. 査読有り

    Wei Guo, Qingqing Miao, Gang Xin, Liqiong Wu, Tingli Ma

    Material Science and Engineering Key Engineering Materials Journal   2010 ( 451 )   21 - 27   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell(DSC) is a new type of photovoltaic device. This paper mainly describes the research results of the development of a novel nitrogen-doped photoanode for DSC in our group. Highly efficient dye-sensitized solar cells (DSCs) of 7.6-10.1% were fabricated.

    DOI: 10.4028/www.scientific.net/KEM.451.21

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  • High-efficiency flexible dye-sensitized solar cells fabricated by a novel friction-transfer technique 査読有り

    Li Yang, Liqiong Wu, Mingxing Wu, Gang Xin, Hong Lin ,Tingli Ma

    Elseviser Science Electrochem Commun   2010 ( 2 )   1000 - 1003   2010年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    All-transparent and all-flexible dye-sensitized solar cells (DSCs) were fabricated using a novel, facile, and low-lost friction-transfer technique, which involved assembling TiO2 films on flexible substrates via hightemperature sintering. This friction-transfer technique led to a 25% enhancement in conversion efficiency compared with the compression method.

    DOI: 10.1016/j.elecom.2010.05.026

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  • A new class of organic dyes based on acenaphthopyrazine for dye-sensitized solar cells. 査読有り

    Zhixia Kong, Huizhi Zhou, Jingnan Cui, Tingli Ma, Licheng Sun

    Elseviser Science J Photochem Photobiol A: Chem,   2010 ( 213 )   152 - 157   2010年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A new class of organic dyes based on acenaphthopyrazine derivatives, containing pyrazine group as the electron acceptor and o-dicarboxyl acids as the anchoring groups were designed and synthesized for application in dye-sensitized solar cells (DSCs). These dyes have short synthesis routes and are easily adsorbed on the surface of TiO2.

    DOI: 10.1016/j.jphotochem.2010.05.017

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  • Dye-sensitized solar cell using natural dyes as sensitizers 査読有り

    Zhou H., Wu L., Miao Q., Xin G., Ma T.

    INEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings   775 - 776   2010年05月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Dye-sensitized solar cell (DSC) is a new class of green photovoltaic cell based on photosynthesis principle in nature. We fabricated the DSCs using ten natural dyes as sensitizers, which extracted from the materials existing in nature and our life, such as flowers, leaves, fruits, traditional Chinese medicines, and beverages. The photoelectrochemical performances of the DSCs based on the dyes showed that the open circuit voltages (Voc) varied from 0.49-0.69 V and the short circuit photocurrent densities (Jsc) were in the range of 0.74-2.69 mA/cm2. It is expected that the energy conversion efficiency can be further improved by introducing functional group and optimizing structure of natural dye. ©2010 IEEE.

    DOI: 10.1109/INEC.2010.5424470

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  • Photoelectrochemical immunosensor by a ru-bipy label on a nanostructured TiO2 electrode 査読有り

    Wu L., Miao Q., Guo W., Zhou H., Ma T.

    INEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings   1389 - 1390   2010年05月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    A newly developed photoelectrochemistry analytical methodology was applied to selective detection of the immunoreaction between anti human IgG and human IgG. The method is based on the principle of the dye-sensitized solar cell, using an NHS-ester derivative of ruthenium polypyridine as the signal indicator and nanoparticle TiO2 as electrode material. After performing the affinity reaction, photoelectrochemical measurement showed that anodic photocurrent was turned on and off repeatedly by control of incidental visible-light, due to light absorption of the ruthenium compound immobilized on the electrode. Owing to its separate source for excitation (light) and detection (current) and the use of electronic detection, the photoelectrochemistry system is expected as a sensitive and low cost method for the detection of biological affinity interaction. ©2010 IEEE.

    DOI: 10.1109/INEC.2010.5424840

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  • Flexible dye-sensitized solar cells 査読有り

    Li Y., Xin G., Wu L., Ma T.

    Progress in Chemistry   21 ( 10 )   2242 - 2249   2009年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell (DSSC) is a new type of photoelectric cells. The research of the flexible DSSC has become more and more important to the photovoltaic industry, which is in pursuit of low-cost production and new application. This paper introduces the latest progress in the research of flexible DSSC, including the choice of the flexible substrates and structure of DSSC. It also reviews several methods for fabrication of nano-porous TiO 2 films, such as hydrothermal method, low-temperature heating, electrophoretic deposition, chemical vapor deposition, microwave irradiation, compression, as well as the new fabrication of flexible counter electrodes. At last, the development tendency and prospects of DSSC are presented.

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  • Effect of annealing temperature on the photocatalytic activity of WO <inf>3</inf> for O <inf>2</inf> evolution 査読有り

    Xin G., Guo W., Ma T.

    Applied Surface Science   256 ( 1 )   165 - 169   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Commercial WO 3 powder was annealed in air at four different temperatures and characterized by XRD and BET. The samples were used for the photooxidation of H 2 O to O 2 under visible light irradiation (λ > 420 nm) in the presence of IO 3- and the evolved gases were analyzed by gas chromatography. The results showed that the WO 3 photocatalyst of monoclinic phase, which was obtained by annealing at 750 °C for 4 h, displayed the best activity in terms of O 2 evolution among all the samples. Moreover, the activity was also found to be slightly affected by the grain size of the WO 3 samples. © 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.apsusc.2009.07.102

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  • Effect of Annealing Temperature on the Photocatalytic Activity of WO3 for O2 evolution, 査読有り

    Gang Xin, Wei Guo, Tingli Ma

    Elseviser Science Appl Surf. Sci.   2009 ( 256 )   165 - 169   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Commercial WO3 powder was annealed in air at four different temperatures and characterized by XRD and BET. The samples were used for the photooxidation of H2O to O2 under visible light irradiation(l > 420 nm) in the presence of IO3_ and the evolved gases were analyzed by gas chromatography. The results showed that the WO3 photocatalyst of monoclinic phase.

  • Progress of Large-scale Dye-sensitized Solar Cell. 査読有り

    吴宝山, 王琳琳,马廷丽

    Chinese Chemical Society Chinese Journal of Power Sources.   2009 ( 11 )   952 - 954   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    大面積の色素増感太陽電池の高効率化について研究した。本論文はデバイスのデザインおよび機能材料の開発研究結果、あるいは光電流および光電圧などの電池の性能を向上する改善策を見出した。

  • Flexible Dye-Sensitized Solar Cells 査読有り

    Li Yang, Gang Xin, Liqiong Wu,Tingli Ma

    Chinese Chemical Society Progress in Chemistry   2009 ( 21 )   2242 - 2249   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye2sensitized solar cell (DSSC) is a new type of photoelectric cells. The research of the flexible DSSC has become more and more important to the photovoltaic industry , which is in pursuit of low2cost production and new application. This paper introduces the latest progress in the research of flexible DSSC , including the choice of the flexible ubstrates and structure of DSSC.

  • Progress in Dye-sensitized nanocrystalline TiO2 Solar Cells 査読有り

    Tingli Ma*,Qingqing Miao

    Chinese Chemical Society Functional Material (Chinese)   2007 ( 38 )   1150 - 1152   2007年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized solar cell(DSC) is a new type of photovoltaic device. This paper mainly describes the mainly research results of the development of a novel nitrogen-doped photoanode for DSCs in our group. Highly efficient dye-sensitized solar cells (DSCs) of 7.6-10.1% were fabricated using prepared nitrogen-doped titania electrodes. The results of the stability test indicated that the DSCs fabricated by the nitrogen-doped titania exhibited great stability.

  • Transient Absorption Spectra of Dynamic Analysis for Electron and Holes in TiO2 Films 査読有り

    Tingli Ma

    Japan Society of Applied Physics Analytical Chemistry (Japan)   2006 ( 11 )   587 - 588   2006年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    色素増感太陽電池の初期過程は、光励起によって色素から半導体へ電子が注入される過程である。本論文は過渡吸収分光法について議論し、反応中間体を計測する手法ぴょび反応機構を研究する手法を紹介した。

  • Progress in a new type of plastic organic solar cell 査読有り

    Ma T.

    Progress in Chemistry   18 ( 2-3 )   176 - 181   2006年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dye-sensitized nanocrystalline electrochemical solar cell (DSC) is a new type of photoelectric cells. It is considered that DSC is a credible alternative to silicon photovoltaic device. This paper introduces the progress of the studies on plastic DSC. Four methods for fabrication of the TiO2 electrodes under low temperature compression, hydrothermal synthesis, microwave irradiation and electrophoretic deposition, are described. The performances of the solar cell based on plastic substrate counter electrodes are reviewed. The tendency and prospects of the organic solar cell are presented.

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  • Study on novel counter electrodes for dye-sensitized crystalline solar cells 査読有り

    Fang X., Zhang Z., Ma T.

    Taiyangneng Xuebao/Acta Energiae Solaris Sinica   27 ( 2 )   111 - 115   2006年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Four types of novel counter electrodes based on flexible metal and plastic substrates have been fabricated and performance characteristics of the dye-sensitized solar cells (DSCs) composed of these counter electrodes have been investigated. The DSCs composed of the counter electrodes based on a stainless steel substrate, a nickel sheet and a conducting plastic film, respectively. The solar conversion efficiencies of 5% have obtained. The counter electrode based on the stainless steel substrate has the merit of improving the conversion efficiency of the DSCs by reducing its internal resistance. The stabilities of the metal and plastic substrates in the electrolyte solution were tested. The long-term stabilities of the DSCs based on these novel counter electrodes were examined, and the routes to improve the long-term stabilities of the DSCs were presented.

    Scopus

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  • Progress of Organic Thin Film solar cells 査読有り

    Tingli Ma

    Japan Society of Applied Physics Progress in Chemistry   2006 ( 2 )   176 - 183   2006年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    色素増感太陽電池は次世代の太陽電池として脚光を浴びている。本文は薄膜太陽電池の研究状況について紹介した。また低温による成膜する方法について紹介した。

  • High-efficiency dye-sensitized solar cell based on a nitrogen-doped nanostructured titania electrode 査読有り

    Ma T., Akiyama M., Abe E., Imai I.

    Nano Letters   5 ( 12 )   2543 - 2547   2005年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode. The properties of the nitrogen-doped titania powder, film, and solar cell were investigated. The substitution of oxygen sites with nitrogen atoms in the titania structure was confirmed by X-ray photoemission spectroscopy (XPS). The UV-vis spectrum of the nitrogen-doped powder and film showed a visible light absorption in the wavelength range from 400 to 535 nm. An enhancement of the incident photon-to-current conversion efficiency (IPCE) in the range of 380-520 nm and 550-750 nm was observed. An 8% overall conversion efficiency has been achieved. The results of the stability test indicated that the solar cell fabricated by the nitrogen-doped titania exhibited great stability. © 2005 American Chemical Society.

    DOI: 10.1021/nl051885l

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  • High efficiency dye-sensitized solar cell based on nitrogen-doped nanocrystalline titania 査読有り

    TL. Ma, K. Akiyama, E. Abe

    Royal Society of Chemistry; Nano Lett..   2005 ( 12 )   2543 - 2547   2005年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode. The properties of the nitrogen-doped titania powder, film, and solar cell were investigated. An enhancement of the incident photon-to-current conversion efficiency (IPCE) in the range of 380-520 nm and 550-750 nm was observed.

  • Flexible counter electrodes based on metal sheet and polymer film for dye-sensitized solar cells 査読有り

    Fang X., Ma T., Akiyama M., Guan G., Tsunematsu S., Abe E.

    Thin Solid Films   472 ( 1-2 )   242 - 245   2005年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Several types of counter electrodes based on flexible metal and plastic substrates for dye-sensitized solar cells (DSCs) have been investigated. The DSCs composed of the counter electrodes based on a stainless steel substrate, a nickel sheet and a conducting plastic film, have obtained conversion efficiencies comparable to that based on the conducting glass. The counter electrode based on the stainless steel substrate has the merit of improving the fill factor and conversion efficiency of the DSC by reducing its internal resistance. The counter electrode based on a polyester film can be aimed at lower cost markets. These counter electrodes based on the metal and plastic substrates are applicable for flexible DSCs. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2004.07.083

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  • Properties of several types of novel counter electrodes for dye-sensitized solar cells 査読有り

    Ma T., Fang X., Akiyama M., Inoue K., Noma H., Abe E.

    Journal of Electroanalytical Chemistry   574 ( 1 )   77 - 83   2004年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The properties of several types of counter electrodes based on metal, plastic, and glass substrates for use in dye-sensitized solar cells (DSCs) were investigated. High conversion efficiencies of ca. 5% for the DSCs based on a stainless steel, nickel sheet and conducting plastic film were obtained. The sheet resistances of the substrates and the platinized counter electrodes were measured. For the large-size DSCs based on the stainless steel counter electrode, the fill factor and conversion efficiency were improved by 20% by reducing the internal resistance of the cell. The stability of the metal and plastic substrates in the electrolyte and the long-term stability of the solar cell based on these counter electrodes were examined. The results revealed that the stainless steel, Ni, and ITOPEN electrodes have good stabilities in the electrolyte. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jelechem.2004.08.002

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  • Effect of the thickness of the Pt film coated on a counter electrode on the performance of a dye-sensitized solar cell 査読有り

    Fang X., Ma T., Guan G., Akiyama M., Kida T., Abe E.

    Journal of Electroanalytical Chemistry   570 ( 2 )   257 - 263   2004年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The effects of the thickness and morphology of a Pt film coated on a counter electrode on the performance of a dye-sensitized solar cell (DSC) were investigated. Deposition of a Pt film ranging in thickness from 2 to 415 nm gradually decreases the sheet resistance of the counter electrode. No significant difference in the charge-transfer resistance at the electrolyte|counter electrode interface was observed for a Pt film thickness ranging from 25 to 415 nm. A high energy conversion efficiency of approximately 5% can be obtained for DSCs based on a counter electrode with a very thin Pt film of 2 nm, as well as with a 415-nm thick Pt film. These results are important for reducing production costs by reducing the required amount of expensive platinum. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jelechem.2004.04.004

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  • Performances characteristics of dye-sensitized solar cells based on counter electrodes with Pt films of different thickness 査読有り

    Fang X., Ma T., Guan G., Akiyama M., Abe E.

    Journal of Photochemistry and Photobiology A: Chemistry   164 ( 1-3 )   179 - 182   2004年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The effects of the thickness of Pt film on the property of platinized counter electrode and the performance of the dye-sensitized solar cell (DSC) were investigated. The Pt film sputtered on an FTO glass is constructed of Pt particles, and the grain size of the Pt particles gradually increased with the increase in the Pt film thickness. When the Pt film thickness exceeds 100 nm, further Pt deposition has no significant effect on the conductivity improvement. In the range between 10 and 415 nm, the Pt film thickness has no significant influence on the performance of the DSC. A high conversion efficiency of ca. 5% was obtained by the DSC composed of the counter electrode with Pt film of 10 nm thickness. These results are important for reducing the production cost by reducing the required amount of expensive platinum. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotochem.2003.12.024

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  • Hydrogen production from sewage sludge solubilized in hot-compressed water using photocatalyst under light irradiation 査読有り

    Kida T., Guan G., Yamada N., Ma T., Kimura K., Yoshida A.

    International Journal of Hydrogen Energy   29 ( 3 )   269 - 274   2004年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Photocatalytic hydrogen production from a digested sewage sludge solubilized in hot-compressed water (573K) was investigated in order to develop a low-cost sacrifice agent for CdS-based photocatalysts from biomass. H 2 evolution occurred over a LaMnO3/CdS composite photocatalyst under Xe lamp irradiation from water containing the solubilized sewage sludge and the amount of evolved H2 reached more than 30 mmol/g-catalyst for a 200 h-reaction; on the other hand, no H2 was formed in the absence of the solubilized sewage sludge. The H2 evolution rate was comparable to that when typical Na2S-Na 2SO3 sacrifice agents were used, suggesting the applicability of a biomass-derived sacrifice agent for photocatalysis. Organic compounds, such as methanol and formic acid, contained in the solubilized sewage sludge are responsible for the H2 evolution observed. © 2003 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijhydene.2003.08.007

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  • Photocatalytic H <inf>2</inf> evolution under visible light irradiation on CdS/ETS-4 composite 査読有り

    Guan G., Kida T., Kusakabe K., Kimura K., Fang X., Ma T., Abe E., Yoshida A.

    Chemical Physics Letters   385 ( 3-4 )   319 - 322   2004年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The photocatalytic activity of a CdS/ETS-4 composite for hydrogen production from water under visible light irradiation (λ>420 nm) was investigated. It is found that nano-sized CdS particles embedded in ETS-4 zeolite nano-pores showed stable photocatalytic activity in an aqueous solution containing Na 2 S and Na 2 SO 3 electron donors and the energy conversion efficiency (ECE) was improved by combining CdS with ETS-4. The results suggest that the encapsulation of CdS in ETS-4 zeolite is effective for improving the activity as well as the stability of CdS. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2004.01.002

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  • Reduction of aqueous CO<inf>2</inf> at ambient temperature using zero-valent iron-based composites 査読有り

    Guan G., Kida T., Ma T., Kimura K., Abe E., Yoshida A.

    Green Chemistry   5 ( 5 )   630 - 634   2003年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    The reduction of CO2 was investigated over zero-valent Fe 0 and Fe0-based composites in an aqueous solution at room temperature. It was found that H2 and a small amount of CH 4 were formed from the CO2-H2O-Fe0 system, while no H2 was formed without CO2. When potassium-promoted Fe0-based composites, Fe0-K-Al and Fe0-Cu-K-Al, were used, the CO2 reduction rates were increased and CH4, C3H8, CH3OH, and C2H5OH were produced together with H2. The fresh and used Fe0 powders after the reaction were analyzed by XPS, XRD, and photoemission yield measurements. The obtained results suggest that in the presence of CO2 as a proton source zero-valent Fe0 is readily oxidized to produce H2 stoichiometrically and that CO 2 is reduced catalytically over the Fe0-based composites with the resulting H2 to produce hydrocarbons and alcohols.

    DOI: 10.1039/b304395a

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  • Photocatalytic hydrogen production from water over a LaMnO<inf>3</inf>/CdS nanocomposite prepared by the reverse micelle method 査読有り

    Kida T., Guan G., Minami Y., Ma T., Yoshida A.

    Journal of Materials Chemistry   13 ( 5 )   1186 - 1191   2003年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A LaMnO3/CdS nanocomposite was prepared by a reverse micelle method and examined for its photocatalytic activity for H2 production from water containing electron donors (Na2S and Na2SO3) under visible light irradiation (λ > 420 nm). The prepared LaMnO3/CdS nanocomposite of 10-20 nm particle size showed 6 times higher photocatalytic activity than that of CdS; on the other hand, LaMnO3 showed no photocatalytic activity. It was also found that LaMnO3/CdS can continuously produce hydrogen from water in the presence of electron donors for more than 200 h. In order to account for the improvement in the activity, the valence edge potentials of CdS and LaMnO3 were investigated by photoemission yield measurements. The proposed energy band scheme for the LaMnO3/CdS composite suggests that photogenerated holes in the valence band of CdS can move to that of LaMnO3 and react with Na2S while photogenerated electrons remain in the conduction band of CdS and react with water to produce H2; this charge-carrier separation is responsible for the improved activity.

    DOI: 10.1039/b211812b

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  • Preparation and properties of nanostructured TiO<inf>2</inf> electrode by a polymer organic-medium screen-printing technique 査読有り

    Ma T., Kida T., Akiyama M., Inoue K., Tsunematsu S., Yao K., Noma H., Abe E.

    Electrochemistry Communications   5 ( 4 )   369 - 372   2003年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    An organic-medium screen-printing technique was developed for making porous TiO2 electrodes. The TiO2 pastes were prepared by mixing only 100% polyalkylene glycol and commercial nanocrystalline TiO2 powders. The obtained paste is highly printable and hard to evaporate during printing. The TiO2 electrodes have a very porous structure with large cavities. The dye-sensitized solar cell based on these meso-macroporous TiO2 electrodes exhibits high overall conversion efficiency of 4.3-5.8%, which is comparable to those of prepared by water or terpineol medium. © 2003 Published by Elsevier Science B.V.

    DOI: 10.1016/S1388-2481(03)00070-5

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  • Spectroscopic and photoelectrochemical study of sensitized layered niobate K <inf>4</inf> Nb <inf>6</inf> O <inf>17</inf> 査読有り

    Yao K., Nishimura S., Imai Y., Wang H., Ma T., Abe E., Tateyama H., Yamagishi A.

    Langmuir   19 ( 2 )   321 - 325   2003年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Different spectroscopic and photoelectrochemical behaviors were observed when racemic and enantiomeric [Ru(bpy) 3 ] 2+ complexes were intercalated in the interlayer of K 4 Nb 6 O 17 , even for the same intercalation amount. The results are interpreted in terms of the stronger interaction between racemic [Ru(bpy) 3 ] 2+ molecules in the interlayer spaces of K 4 Nb 6 O 17 . The faster emission decay and lower photocurrent of the racemic [Ru(bpy) 3 ] 2+ -K 4 Nb 6 O 17 compound compared to the enantiomeric ones suggest that stronger concentration quenching exists between the racemic [Ru(bpy) 3 ] 2+ ions in the interlayer of K 4 Nb 6 O 17 . Combining the spectroscopic and photoelectrochemical results, the racemic [Ru(bpy) 3 ] 2+ ions are considered to intercalate more densely than the enantiomeric [Ru(bpy) 3 ] 2+ ions in the interlayer of K 4 Nb 6 O 17 , even for the same intercalation amount. Two cationic dyes were also directly intercalated into K 4 Nb 6 O 17 . The spectroscopic and photoelectrochemical behaviors of the dye-K 4 Nb 6 O 17 compounds were investigated.

    DOI: 10.1021/la026065s

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  • Photoelectrochemical properties of TiO<inf>2</inf> electrodes sensitized by porphyrin derivatives with different numbers of carboxyl groups 査読有り

    Ma T., Inoue K., Yao K., Noma H., Shuji T., Abe E., Yu J., Wang X., Zhang B.

    Journal of Electroanalytical Chemistry   537 ( 1-2 )   31 - 38   2002年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The photochemical and photoelectrochemical properties of two porphyrin derivatives with different numbers of carboxyl groups were investigated. The two porphyrin derivatives are 5-(4-carboxyphenyl)-10,15,20-tritolylporphyrin (H2TC1PP) and 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (H2TC4PP). The interaction between the porphyrin and TiO2 is determined by the UV-vis spectra. Differences in adsorption behavior of the two porphyrin derivatives on the TiO2 electrode surface were observed. The IR data suggest that both of the porphyrins adsorb by bridging or bidentate chelate coordination on the TiO2 surface. Comparing the luminescence spectra of the two porphyrins in solution and the solid state, no spectral difference was observed. However, we found that the variation in the number of carboxyl groups has an influence on the fluorescence spectra of the adsorbed TiO2 electrode. Furthermore, we measured and compared the incident photon-to-current conversion efficiency (IPCE) and the light-to-electrical conversion efficiency of the porphyrin-sensitized solar cell. These results revealed that the number of functional groups influenced the photoelectrochemical properties of the cell. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0022-0728(02)01225-1

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  • Effect of functional group on photochemical properties and photosensitization of TiO<inf>2</inf> electrode sensitized by porphyrin derivatives 査読有り

    Ma T., Inoue K., Noma H., Yao K., Abe E.

    Journal of Photochemistry and Photobiology A: Chemistry   152 ( 1-3 )   207 - 212   2002年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A series of porphyrin derivatives containing carboxylic-, sulfo- and hydro- groups, 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP), 5,10,15,20-tetrakis(4-sulfophenyl)porphyrin (TSPP) and 5,10,15,20-tetraphenyl-porphyrin (TPP), were examined as sensitizers for porous nanocrystalline TiO2. The difference in the adsorption behavior on the TiO2 electrode surface was discussed. The interaction between the porphyrins and the TiO2 surface was determined and compared using UV-Vis spectra and X-ray photoelectron spectroscopy (XPS). The luminescence spectra of the porphyrins in DMF solution and adsorbed onto TiO2 electrodes were measured. The ionization potentials of the porphyrins in the solid state and adsorbed onto TiO2 electrodes were determined by a new approach using an apparatus for measuring the emission yield under atmospheric conditions. The importance of the binding states between the dye and TiO2 surface was discussed by comparison of the energy conversion efficiency in a dye-sensitized solar cell. The results indicate that the binding state and the amount of adsorbed dye are important factors affecting the properties of the dye-sensitized solar cell. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S1010-6030(02)00025-4

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  • Ionization potential studies of organic dye adsorbed onto TiO<inf>2</inf> electrode 査読有り

    Ma T., Inoue K., Noma H., Yao K., Abe E.

    Journal of Materials Science Letters   21 ( 13 )   1013 - 1014   2002年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A study was conducted on the relative energy levels of the seven organic dyes absorbed onto the TiO2 electrode using UV photoemission yield spectroscopy under an atmospheric condition. The energy levels revealed the shifts due to the adsorption on the surface of the TiO2 electrode, and this shift corresponded to the shifts observed by UV-vis spectra.

    DOI: 10.1023/A:1016008623732

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  • Fabrication and photoelectrochemical characterization of CdS particles in nanospaces of expandable mica 査読有り

    Yao K., Nishimura S., Ma T., Inoue K., Abe E., Tateyama H., Yamagishi A.

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   201 ( 1-3 )   63 - 71   2002年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Photoelectrochemical properties are investigated for CdS nanoparticles formed in a solution as well as in the nanospaces of expandable mica (EM). The smallest sized CdS particles (≈3 nm in diameter) were obtained in the nanospaces of Cd2+ exchanged EM (1.2 μm in crystal size) by reacting with H2S in the absence of interlayer water. The existence of interlayer water was found to influence the size of CdS particles remarkably. Smaller EM crystals limited the particle growth of CdS along the sheets. Photocurrent was measured for the CdS-EM suspensions/methylviologen system and the CdS-EM film electrode. The variation of the steady state photocurrent value (iss) with pH, showed that iss increased with the decrease of CdS particle size, while the intersection point (termed as pH0) showed a negative shift with the decrease of CdS particle size. The action spectrum of the CdS-EM film electrode was in good agreement with their absorption spectra of the suspension. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)00751-8

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  • Effect of Microchannel on Improving the Photoelectro- chemical Performance of Nanostructured TiO<inf>2</inf> Electrodes Sensitized by Ru Complex 査読有り

    Ma T., Inoue K., Kida T., Noma H., Abe E.

    International Journal of Nonlinear Sciences and Numerical Simulation   3 ( 3-4 )   445 - 448   2002年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The photoelectrochemical behaviors of the dye-sensitized nanoporous TiO2 solar cell with and without microchannels were studied. A remarkably enhancement in the photocurrent of the cell with the microchannels on the TiO2 electrode was observed. The resistances of the cells were valuated by measuring the electrical impedance. It was found that the resistances of the cell with the microchannels became smaller than those of the cell without microchannnels. These results suggest that the diffusion of the iodide/triiodide species in the electrolyte was promoted.

    DOI: 10.1515/IJNSNS.2002.3.3-4.445

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  • Spectroscopic and photoelectrochemical differences between racemic and enantiomeric [ru(phen)<inf>3</inf>]<sup>2+</sup> ions intercalated into layered niobate k<inf>4</inf>nb<inf>6</inf>o<inf>17</inf> 査読有り

    Yao K., Nishimura S., Ma T., Okamoto K., Inoue K., Abe E., Tateyama H., Yamagishi A.

    Journal of Electroanalytical Chemistry   510 ( 1-2 )   144 - 148   2001年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Chirality effects have been observed in the intercalation, spectroscopic and photoelectrochemical behavior when enantiomeric and racemic [Ru(phen)3]2+ complexes were intercalated in the interlayer spaces of K4Nb6O17. The results were interpreted in terms of a [Nb6O17]4--chelate and chelate-chelate interactions. The faster luminescence decay and higher photocurrent of the enantiomeric [Ru(phen)3]2+-K4Nb6O17 compounds than the racemic ones suggest that the emission of adsorbed [Ru(phen)3]2+ ions was not only quenched by adsorbed complexes (or concentration quenching) but also by the semiconductive host lattices. © 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0022-0728(01)00535-6

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  • Photoe lectrochem ical properties of nanocr ysta lline TiO<inf>2</inf> electrod es sensitized by porphyrin derivatives with different functional groups 査読有り

    Ma T., Inoue K., Yao K., Noma H., Abe E.

    Proceedings of the IEEE Conference on Nanotechnology   2001-January   522 - 527   2001年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2001 IEEE. Porous seminconductor TiO2 electrode was prepared by coating a conducting glass support. The photoelectrochemical properties of the nanocrystalline TiO2 electrodes sensitized by porphyrin derivatives with different functional groups, e.g., carboxyl, sulfonate and phenyl were investigated. It was found that the all porphyrin derivatives used in this study had sensitization effect. The interaction between the porphyrin and the TiO2 surface is determined and compared using UV-vis spectra. The adsorption behavior of the porphyrin on the TiO2 electrode surface was discussed. Furthermore, we examined the photoelectrochemical properties of a free base porphyrin with only one carboxylate group (H2TC1PP), the result obtained was compared with that of porphyrin with four carboxyl groups (H2TC4PP). It reveals that the higher photocurrent intensity of H2TC4PP can be obtained than that of H2TC1PP, and the energy conversion efficiency of the solar cell is very dependent on the structure of porphyrin. These results indicate that the binding state between the dye and semiconductor is an important factor affecting the properties of the dye-sensitized solar cell.

    DOI: 10.1109/NANO.2001.966478

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  • Photosensitization of porous TiO<inf>2</inf> semiconductor electrode with porphyrin derivatives 査読有り

    Ma T., Inoue K., Noma H., Yao K., Abe E., Akiyma T., Yamada S.

    Proceedings of SPIE - The International Society for Optical Engineering   4220   379 - 382   2000年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    A series of porphyrin derivatives containing carboxylic-, sulfo-, and phenyl groups, 5,10,15,20-tetrakis(4-carboxyphenyl)-porphyrin(H2TCPP), 5,10,15,20-tetrakis(4-sulfophenyl)-porphyrin(H2TSPP), and 5,10,15,20-tetraphenyl)-porphyrin(H2TPP), were used as sensitizers for porous nanocrystalline TiO2. The photosensitization and the absorption properties dye absorbed TiO2 electrodes were examined. The incident photo to current efficiencies (IPCE) of 40% for H2TCPP/TiO2 has been obtained at the wavelength of a maximum absorption of the dye in the presence of iodide as an electron donor. Under the same conditions, the electrode of H2TSPP and H2TPP shown the efficiencies of 10% and 2%, respectively. We also explored the influence of different substitute on absorption spectra of TiO2 electrode coated with these dyes.

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  • Synthesis and characterization of a novel macrocyclic ligand containing catechol donor groups and its oxovanadium (IV) complex 査読有り

    Ma T., Kojima T., Matsuda Y.

    Polyhedron   19 ( 9 )   1167 - 1172   2000年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A novel macrocyclic ligand containing catechol moieties, 9,10,21,22-tetrahydroxy-7,12,19,24-tetraoxo-2,3,4,5:8,9,10,11:14,15,16, 17:20,21,22,23-tetrabenzena-1,6,13,18-tetraazacyclotetracosane (H4L), was designed and synthesized. For comparison, an acyclic ligand, 1,4-bis(2,3-dihydroxybenzammido)benzene (H4La), was also synthesized. Their oxovanadium(IV) complexes K(ppn)[VO(L)] and K2[VO(La)] were prepared and characterized by IR, UV-Vis and ESR spectroscopies. The ESR spectra of the complexes measured at 77 K in diethyl sulfoxide-ethanol revealed unusual rhombic characteristics of the complexes, suggesting the coordination geometry of the complexes was distorted square-pyramidal. Based on these data, the complex is proposed to possess a bowl-like structure capped by the VO2+ moiety with a hydrophobic cavity. (C) 2000 Elsevier Science Ltd.

    DOI: 10.1016/S0277-5387(00)00387-9

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  • An efficient method for the synthesis of 4,5-disubstituted catechols 査読有り

    Ma T., Kojima T., Matsuda Y.

    Bulletin of the Chemical Society of Japan   73 ( 3 )   747 - 748   2000年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    4,5-Disubstituted catechols were prepared in high yields via successive Friedel-Crafts acylation in the presence of a Ti(IV) catalyst or I2 and reduction with triethylsilane of veratroles. This method provides an effective and well-regulated synthetic strategy toward catechol derivatives having a variety of substituents at the 4- and 5- positions.

    DOI: 10.1246/bcsj.73.747

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▼全件表示

著書

  • Dye-Sensitized Solar Cells -Theoretical Basis to Technical Application

    馬 廷麗,雲 斯寧(共著)

    化学工業出版社   2013年08月 

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    記述言語:中国語

  • Inorganic Materials for Dye-sensitized Solar Cells

    ZZhiQuanlin(単著)

    by Trans Tech Publications Inc., Switzerland  2011年05月 

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    記述言語:英語

  • 色素増感太陽電池の最新技術 “ポルフィリン(porphyrin)色素増感太陽電池の開発”

    馬 廷麗,安部 英一(共著 ,  範囲: 第八章)

    日本CMC出版社出版  2001年01月 

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    記述言語:日本語

    ポルフィリン類を用いた色素増感太陽電池についての研究成果及び著者等の研究結果について紹介する。

口頭発表・ポスター発表等

  • Petal-like FeSx/WS2 Heterojunction as a Highly Efficient Electrocatalyst for Hydrogen Envolution Reaction

    陳 翰林,馬 廷麗,李 艷強

    電気化学会第89回大会  2022年03月 

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    開催期間: 2022年03月15日 - 2022年03月17日   記述言語:英語  

  • Synthesis of one-dimensional vanadium-doped CoS/Co9S8 heterojunctions as bifunctional electrocatalysts for zinc-air battery

    黄 会勇

    電気化学会第89回大会  2022年03月 

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    開催期間: 2022年03月15日 - 2022年03月17日   記述言語:英語  

  • A cross-linked tin oxide/polymer composite gel electrolyte with adjustable porosity for enhanced sodium-ion batteries

    趙 越, 劉 宏彬, 馬 廷麗

    第62回電池討論会  2021年11月 

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    開催期間: 2021年11月30日 - 2021年12月02日   記述言語:英語  

  • A Double Perovskite Participation for Promoting Stability and Performance of Carbon-Based CsPbI2Br Perovskite Solar Cells

    Qianji Han, Shuzhang Yang, Liang Wang, Tingli Ma

    第 18 回「次世代の太陽光発電システム」シンポジウム  2021年10月 

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    開催期間: 2021年10月14日 - 2021年10月15日   記述言語:英語   開催地:オンライン  

  • Hierarchical porous architectures derived from low-cost biomass equisetum arvense as a promising anode material for lithium-ion batteries

    Yun Chen, Hongbin Liu, Tingli Ma

    The 88th ECSJ Spring Meeting 

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    開催期間: 2020年03月   記述言語:英語   開催地:Tokyo, Japan  

  • Hollow-Structure Engineering of Silicon-Carbon Anode for Ultra-Stable Lithium-ion Batteries

    Hongbin Liu, Yun Chen, Yue Zhao, Bo Jiang, Tingli Ma

    The 88th ECSJ Spring Meeting 

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    開催期間: 2020年03月   記述言語:英語   開催地:Tokyo, Japan  

  • Interfacial engineering for carbon-based perovskite solar cells

    Tingli Ma

    International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP20) 

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    開催期間: 2020年01月20日 - 2020年01月22日   記述言語:英語   開催地:筑波  

  • Bifunctional Dye Molecule in All-Inorganic CsPbIBr2 Perovskite Solar Cells with Efficiency Exceeding 10%

    Shuzhang Yang, Zhanglin Guo, Liguo Gao, Tingli Ma

    International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP20) 

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    開催期間: 2020年01月20日 - 2020年01月22日   記述言語:英語   開催地:筑波  

  • A New Strategy of Methylamine Iodide Solution Assisted Repair for Pinhole-Free Perovskite Films in High-Efficiency Photovoltaic under Ambient Conditions

    Liang Wang, Shuzhang Yang, Fengjing Liu, Chao Jiang, Tingli Ma

    International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP20) 

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    開催期間: 2020年01月20日 - 2020年01月22日   記述言語:英語   開催地:筑波  

  • プロブスカイト太陽電池の材料開発

    馬 廷麗

    第16回 「次世代の太陽光発電システム」シンポジウム  (独)日本学術振興会 産学協力研究委員会 第175 委員会

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    開催期間: 2019年07月04日 - 2019年07月05日   記述言語:日本語   開催地:宮崎  

  • Metal Ion Incorporation into CsPbI2Br for Stable and Efficient All-Inorganic Perovskite Solar Cells Based-on Carbon Electrode

    Tingli Ma

    10th International Conference on Materials for Advanced Technologies(ICMAT2019) 

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    開催期間: 2019年06月23日 - 2019年06月28日   記述言語:英語   開催地:Singapore  

  • Development of Novel and Highly Stable Crystals of Lead-Free Double Perovskite Based-on Bismuth

    Tingli Ma

    2019 MRS SPRING MEETING & EXHIBIT 

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    開催期間: 2019年04月22日 - 2019年04月26日   記述言語:英語   開催地:アメリカ、アリゾナ  

  • New 2D Materials for Highly Efficient Perovskite Solar Cells

    Tingli Ma

    International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19) 

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    開催期間: 2019年01月27日 - 2019年01月29日   記述言語:英語   開催地:京都