Interface-induced charge transfer pathway switching of a Cu_(2)O-TiO_(2)photocatalyst from p-n to S-scheme heterojunction for effective photocatalytic H_(2)evolution  

作　　者：Kaihui Huang Guijie Liang Shaolong Sun Haobin Hu Xiaoming Peng Rongchen Shen Xin Li 

机构地区：[1]Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization,Ministry of Agriculture and Rural Affairs,South China Agricultural University,Guangzhou 510642,China [2]Hubei Key Lab Low Dimens Optoelect Mat&Devices,Hubei University of Arts and Science,Xiangyang 441053,China [3]College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China [4]Key Laboratory of Efficient Utilization of Oil and Gas Resources in Longdong,College of Petroleum and Chemical Engineering,Longdong University,Qingyang 745000,China [5]State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,China

出　　处：《Journal of Materials Science & Technology》2024年第26期98-106,共9页材料科学技术(英文版)

基　　金：X.Li thanks the National Natural Science Foundation of China(Nos.21975084 and 51672089);the Natural Science Foundation of Guangdong Province(No.2021A1515010075)for their support.;X.Peng thanks the State Key Laboratory of Pollution Control and Resource Reuse Foundation(No.PCRRF21028)for the support.

摘　　要：Photocatalytic hydrogen evolution from water splitting is an appealing method for producing clean chemical fuels.Cu_(2)O,with a suitable bandgap,holds promise as a semiconductor for this process.However,the strong photo-corrosion and rapid charge recombination of Cu_(2)O strongly limit its application in the photocatalytic fields.Herein,an S-scheme heterojunction photocatalyst composed of TiO_(2)and Cu_(2)O was rationally designed to effectively avoid the photo-corrosion of Cu_(2)O.The introduction of an interfacial nitrogen-doped carbon(NC)layer switches the heterojunction interfacial charge transfer pathway from the p-n to S-scheme heterojunction,which avoids excessive accumulation of photogenerated holes on the surface of Cu_(2)O.Meanwhile,the hybrid structure shows a broad spectral response(300-800 nm)and efficient charge separation and transfer efficiency.Interestingly,the highest photocatalytic hydrogen evolution rate of TiO_(2)-NC-3%Cu_(2)O-3%Ni is 13521.9μmol g^(-1)h^(-1),which is approximately 664.1 times higher than that of pure Cu_(2)O.In-situ X-ray photoelectron spectroscopy and Kelvin probe confirm the charge transfer mechanism of S-scheme heterojunction.The formation of S-scheme heterojunctions effectively accelerates the separation of photogenerated electron-hole pairs and enhances redox capacity,thereby improving the photocatalytic performance and stability of Cu_(2)O.This study provides valuable insights into the rational design of highly efficient Cu_(2)O-based heterojunction photocatalysts for hydrogen production.

关 键 词：Photocatalytic hydrogen evolution Cu_(2)O S-scheme heterojunction Charge separation mechanism Nitrogen doped carbon 

分 类 号：TG1[金属学及工艺—金属学]