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2d/2d S-scheme heterojunction with a covalent organic framework and g-C_(3)N_(4) nanosheets for highly efficient photocatalytic H2 evolution

引用

Chinese Journal of Catalysis 2022年第10期43卷 2592-2605页

作者： Pengyu dong Aicaijun Zhang Ting Cheng Jinkang Pan Jun Song Lei Zhang Rongfeng Guan Xinguo Xi Jinlong Zhang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051JiangsuChina School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051JiangsuChina Key Laboratory for Ecological-Environment materials of Jiangsu Province School of Materials Science and EngineeringYancheng Institute of TechnologyYancheng 224051JiangsuChina Key Laboratory for Advanced materials and Institute of Fine Chemicals School of Chemistry&Molecular EngineeringShanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource UtilizationEast China University of Science and TechnologyShanghai 200237China

The fabrication of S-scheme heterojunctions with fast charge transfer and good interface contacts,such as intermolecularπ–πinteractions,is a promising approach to improve photocatalytic performance.A unique two-dimensional/two-dimensional(2d/2d)S-scheme heterojunction containing TpPa-1-COF/g-C_(3)N_(4) nanosheets(denoted as TPCNNS)was *** established maximum interfacial interaction between TpPa-1-COF NS and g-C_(3)N_(4) NS may result in aπ–πconjugated ***,the difference in the work functions of TpPa-1-COF and g-C_(3)N_(4) results in a large Fermi level gap,leading to upward/downward band edge *** spontaneous interfacial charge transfer from g-C_(3)N_(4) to TpPa-1-COF at theπ–πconjugated interface area results in the presence of a built-in electric field,according to the charge density difference analysis based on density functional theory *** an enhanced built-in electric field can efficiently drive directional charge migration via the S-scheme mechanism,which enhances charge separation and ***,an approximately 2.8 and 5.6 times increase in the photocatalytic hydrogen evolution rate was recorded in TPCNNS-2(1153μmol g^(-1) h^(-1))compared to pristine TpPa-1-COF and g-C_(3)N_(4) NS,respectively,under visible light ***,this work opens new avenues in the fabrication of 2d/2dπ–πconjugated S-scheme heterojunction photocatalysts with highly efficient hydrogen evolution performance.

关键词： Covalent organic framework g-C_(3)N_(4) π-πConjugated 2d/2d material S-Scheme heterojunction Photocatalytic hydrogen evolution

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