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2D MXenes as Co-catalysts in Photocatalysis:Synthetic Methods

Nano-Micro Letters 2019年第4期11卷 403-424页

作者： Yuliang Sun Xing Meng yohan dall’agnese Chunxiang dall’agnese Shengnan Duan Yu Gao Gang Chen Xiao-Feng Wang Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012People’s Republic of China Jilin Key Engineering Laboratory of New Energy Materials and Technologies Jilin UniversityChangchun 130012People’s Republic of China A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphiaPA 19104USA Institute for Materials Discovery Faculty of Maths and Physical SciencesUniversity College LondonLondon WC1E 7JEUK

Since their seminal discovery in 2011,two-dimensional(2D)transition metal carbides/nitrides known as MXenes,that constitute a large family of 2D materials,have been targeted toward various applications due to their outstanding electronic *** functioning as co-catalyst in combination with certain photocatalysts have been applied in photocatalytic systems to enhance photogenerated charge separation,suppress rapid charge recombination,and convert solar energy into chemical energy or use it in the degradation of organic *** photocatalytic performance greatly depends on the composition and morphology of the photocatalyst,which,in turn,are determined by the method of preparation ***,we review the four different synthesis methods(mechanical mixing,self-assembly,in situ decoration,and oxidation)reported for MXenes in view of their application as co-catalyst in *** addition,the working mechanism for MXenes application in photocatalysis is discussed and an outlook for future research is also provided.

关键词： MXenes Photocatalysis Co-catalyst Synthetic methods

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Surface-Modified Metallic Ti3C2Tx MXene as Electron Transport Layer for Planar Heterojunction Perovskite Solar Cells

Surface-Modified Metallic Ti3C2Tx MXene as Electron Transpor...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Lin Yang Chunxiang dall’agnese yohan dall’agnese Gang Chen Yu Gao Yoshitaka Sanehira Ajay Kumar Jena Xiao-Feng Wang Yury Gogotsi Tsutomu Miyasaka Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University

MXenes are a large and rapidly expanding family of two-dimensional(2 D) materials which,owing to their unique optoelectronic properties and tunable surface termination,find a wide range of applications including energy storage and energy *** this work,TiCT MXene nanosheets are applied as a novel type of electron transport layer(ETL) in low-temperature processed planar-structured perovskite solar cells(PSCs).Interestingly,simple UV-ozone treatment of the metallic TiCT that increases the surface Ti-O bonds without any change in its bulk properties like high electron mobility improves its suitability as an *** electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency(PCE) from 5.00% in the case of TiCT without UV-ozone treatment to the champion PCE of 17.17%,achieved using the TiCT film after 30 minutes of UV-ozone *** the first report on the use of pure MXene layer as an ETL in PSCs,this work shows great potential of MXenes to be used in PSCs and displays their promises for applications in photovoltaic technology in general.

关键词： UV-ozone treatment Ti3C2Tx MXene electron transport layers perovskite solar cells

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Performance improvement of MXene-based perovskite solar cells upon property transition from metallic to semiconductive by oxidation of Ti3C2Tx in air

Performance improvement of MXene-based perovskite solar cell...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Lin Yang Dongxiao Kan Chunxiang dall’agnese yohan dall’agnese Baoning Wang Ajay Kumar Jena Yingjin Wei Gang Chen Xiao-Feng Wang Yury Gogotsi Tsutomu Miyasaka Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of PhysicsJilin University

The unique properties of MXenes that arise from terminated functional groups and oxidization of MXenes make them attractive for application in photovoltaic devices like perovskite solar cells(PSCs). Here, oxidation of TiCT hydrocolloid was carried out to tune its properties desirable for an electron transport layer(ETL) in low-temperature processed PSCs. The calculations of the energy levels were carried out by the Vienna ab initio Simulation Package(VASP) code based on density functional theory(DFT). Oxidation of TiCT can generate Ti-O bonds and effectively reduce the defects of the film fabricated by spin-coating, while a transition from metallic material to semiconductor occurred after heavy oxidation. A better matching of energy levels between perovskite and ETL layer in the case of a hybrid of oxidized and pristine TiCT renders a champion power conversion efficiency(PCE) of 18.29 %. The improvement in PCE can be attributed to the increased electron mobility in the ETL, which promotes electron transport and reduces the electronhole recombination. Hence, by presenting a simple method for high performance in PSCs by MXene-derived materials, the work demonstrates the great potential of these materials for applications in low-temperature processed PSCs and other photovoltaic technologies.

关键词： Ti3C2Tx MXene electron transport layers perovskite solar cells DFT calculations

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