Internal electric field modulation by copper vacancy concentration of cuprous sulfide nanosheets for enhanced selective CO_(2) photoreduction  

作　　者：Xian Shi Weidong Dai Xiaoqian Li Yang Bai Qin Ren Yao Lei Xing'an Dong 

机构地区：[1]School of Chemistry and Environmental Engineering,Sichuan University of Science&Engineering,Zigong 643000,Sichuan,China [2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,School of Oil&Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan,China [3]Chongqing Key Laboratory of Photo-Electric Functional Materials,College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,Sichuan,China [4]Research Center for Environmental and Energy Catalysis,Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China

出　　处：《Journal of Energy Chemistry》2024年第4期324-330,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52200123);the Open Project of Key Laboratory of Green Chemical Engineering Process of Ministry of Education(GCP2022007);the Scientific Research and Innovation Team Program of Sichuan University of Science and Engineering(SUSE652A014)。

摘　　要：Although the internal electric field(IEF)of photocatalysts is acknowledged as a potent driving force for photocharge separation,modulating the IEF intensity to achieve enhanced photocatalytic performances remains a challenge.Herein,cuprous sulfide nanosheets with different Cu vacancy concentration were employed to study IEF modulation and corresponding direct charge transfer.Among the samples,Cu_(1.8)S nanosheets possessed intensified IEF intensity compared with those of Cu_(2)S and Cu_(1.95)S nanosheets,suggesting that an enhanced IEF intensity could be achieved by introducing more Cu vacancies.This intensified IEF of Cu_(1.8)S nanosheets induced numerous photogenerated electrons to migrate to its surface,and the dissociative electrons were then captured by Cu vacancies,resulting in efficient charge separation spatially.In addition,the Cu vacancies on Cu_(1.8)S nanosheets accumulated electrons as active sites to lower the energy barrier of rate-determining step of CO_(2)photoreduction,leading to the selective conversion of CO_(2)to CO.Herein,the manipulation of IEF intensity through Cu vacancy concentration regulation of cuprous sulfide photocatalysts for efficient charge separation has been discussed,providing a scientific strategy to rationally improve photocata lytic performances for solar energy conversion.

关 键 词：Internal electric field intensity Cuprous sulfide photocatalysts Cu vacancies Charge separation Selective CO_(2) photoreduction 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]