研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

分割表示453 件中 321 - 340 件目／全件表示 >>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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