Schottky-assisted S-scheme heterojunction photocatalyst CdS/Pt@NU-1000 for efficient visible-light-driven H2 evolution

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外文摘要：Coupling metal-organic frameworks(MOFs)with inorganic semiconductors to construct S-scheme hetero-junction photocatalysts is an effective way to facilitate photocarriers transfer and separation,as well as enhance redox ability for photocatalytic water-splitting into H2.However,the poor electrical conductiv-ity of MOFs,fast recombination of photogenerated electron-hole pairs,and slow surface redox reaction rates on photocatalysts lead to inefficient consumption of all charge carriers thus impeding further im-provement of photocatalytic activity.Thus,optimizing the separation,transfer,and utilization efficiencies of interfacial charge carriers in MOFs-based S-scheme heterojunction may pave the way for achieving excellent photocatalytic activity.Herein,a novel Schottky-assisted S-scheme heterojunction photocata-lyst CdS/Pt@NU-1000 was prepared by the combination of Pt-embedded NU-1000 with CdS.The opti-mized photocatalyst CdS/0.7Pt@NU-1000 exhibits the highest visible-light-driven H2 evolution rate with 3.604 mmol g-1 h-1,which is 12.7 and 18.8 folds of that for single CdS and NU-1000,respectively.The splendid photocatalytic performance benefited from the broadened light absorption,and the synergis-tic effect of the formed Schottky junction and S-scheme heterojunction.Furthermore,the formation of the S-scheme system was validated by density functional theory(DFT)calculations,in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS),and electron paramagnetic resonance(EPR)test.This work can provide some guidance for the design of efficient heterojunction photocatalysts by optimizing interfacial charge transfer.

外文关键词：

Photocatalytic H2 productionSchottky junctionS-scheme heterojunctionInterfacial charge transfer

作者：

Heng Yang、Jie Guo、Yang Xia、Juntao Yan、Lili Wen

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作者单位：

College of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China

College of Chemistry,Central China Normal University,Wuhan 430079,China

Key Laboratory of Green Chemical Engineering Process of Ministry of Education,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430072,China

基金：

National Nature Science Foundation of ChinaNational Nature Science Foundation of ChinaNational Nature Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities

项目编号：

221710972177107222108211CCNU22QN008WUT:2021IVA019B

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.051

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.195(28)