研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

分割表示453 件中 161 - 180 件目／全件表示 >>

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

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

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

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 & interfaces 12 ( 30 ) 34479 - 34486 2020年07月

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85078871234&origin=inward

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

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85072315281&origin=inward

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