Constructing extrinsic oxygen vacancy on the surface of photocatalyst as CO_(2)and electrons reservoirs to improve photocatalytic CO_(2)reduction activity  

作　　者：Zaiyong Jiang Hao Li Zhimin Yuan Zheng Wang Maohong Fan Wenkang Miao Hong He 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]School of Chemistry&Chemical Engineering and Environmental Engineering,Weifang University,Weifang,Shandong 261061,China [3]Departments of Chemical and Petroleum Engineering,University of Wyoming,Laramie,WY 82071,USA [4]Materials Genome Institute,Shanghai University,Shanghai 200444,China

出　　处：《Journal of Environmental Sciences》2024年第6期37-45,共9页环境科学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.21637005);the China Postdoctoral Science Foundation(No.2020M670483)。

摘　　要：Constructing own oxygen vacancies in the photocatalysts is a very promising method to improve their photocatalytic CO_(2)reduction activity.However,some catalysts have excellent stabilities,making it difficult for them to construct their own oxygen vacancies.To simplify the above difficulty of stable photocatalysts,constructing extrinsic oxygen vacancies on their surface as a novel idea is proposed.Here,a stable TiO_(2)nanosheet is chosen as a research object,we uniformly deposited BiOCl quantum dots on their surface via a simple adsorption-deposition method.It is found that BiOCl quantum dots are able to simultaneously self-transform into defective BiOCl with many oxygen vacancies when the photocatalyst is performed photocatalytic CO_(2)reduction.These extrinsic oxygen vacancies can act as“CO_(2)and photo-generated electrons reservoirs”to improve CO_(2)capture and accelerate the separation of photogenerated electrons and holes.For the above reasons,the modified TiO_(2)showed obvious enhancement of photocatalytic CO_(2)reduction compared to pristine TiO_(2)and BiOCl.This work may open a new avenue to broaden the use of oxygen vacancies in the process of photocatalytic CO_(2)reduction.

关 键 词：Oxygen vacancy BiOCl PHOTOCATALYST CO_(2)reduction TiO_(2) 

分 类 号：X701[环境科学与工程—环境工程]