Schottky-assisted S-scheme heterojunction photocatalyst CdS/Pt@NU-1000 for efficient visible-light-driven H_(2)evolution  

作　　者：Heng Yang Jie Guo Yang Xia Juntao Yan Lili Wen 

机构地区：[1]College of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China [2]College of Chemistry,Central China Normal University,Wuhan 430079,China [3]Key Laboratory of Green Chemical Engineering Process of Ministry of Education,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430072,China

出　　处：《Journal of Materials Science & Technology》2024年第28期155-164,共10页材料科学技术(英文版)

基　　金：supported by the National Nature Science Foundation of China(Nos.22171097,21771072,and 22108211);the Fundamental Research Funds for the Central Universities(Grant Nos.CCNU22QN008 and WUT:2021IVA019B).

摘　　要：Coupling metal-organic frameworks(MOFs)with inorganic semiconductors to construct S-scheme heterojunction photocatalysts is an effective way to facilitate photocarriers transfer and separation,as well as enhance redox ability for photocatalytic water-splitting into H_(2).However,the poor electrical conductivity 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 improvement 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 photocatalyst 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 H_(2)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 Xray 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.

关 键 词：Photocatalytic H_(2)production Schottky junction S-scheme heterojunction Interfacial charge transfer 

分 类 号：O64[理学—物理化学]