Boosted photoreduction of diluted CO_(2) through oxygen vacancy engineering in NiO nanoplatelets  

作　　者：Weiyi Chen Xueming Liu Bin Han Shujie Liang Hong Deng Zhang Lin 

机构地区：[1]School of Environment and Energy,Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling,South China University of Technology,Guangzhou,510006,China [2]Guangdong Engineering and Technology Research Center for Environmental Nanomaterials,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education),South China University of Technology,Guangzhou,510006,China

出　　处：《Nano Research》2021年第3期730-737,共8页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21777046 and 21836002);the National Key Research and Development Program of China(No.2019YFA0210400);the Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06N569);Guangdong Science and Technology Program(No.2020B121201003);the Science and Technology Project of Guangzhou(No.201803030002).

摘　　要：Converting carbon dioxide(CO_(2))to diverse value-added products through photocatalysis can validly alleviate the critical issues of greenhouse effect and energy shortages simultaneously.In particular,based on practical considerations,exploring novel catalysts to achieve efficient photoreduction of diluted CO_(2) is necessary and urgent.However,this process is extremely challenging owing to the disturbance of competitive adsorption at low CO_(2) concentration.Herein,we delicately synthesize oxygen vacancy-laden NiO nanoplatelets(r-NiO)via calcination under Ar protection to reduce diluted CO_(2) through visible light irradiation(>400 nm)assisted by a Ru-based photosensitizer.Benefitting from the strongly CO_(2) adsorption energy of oxygen vacancies,which was confirmed by density functional calculations,the r-NiO catalysts exhibit higher activity and selectivity(6.28×10^(3)µmol·h^(−1)·g^(−1);82.11%)for diluted CO_(2)-to-CO conversion than that of the normal NiO(3.94×10^(3)µmol·h^(−1)·g^(−1);65.26%).Besides,the presence of oxygen vacancies can also promote the separation of electron-hole pairs.Our research demonstrates that oxygen vacancies could act as promising candidates for photocatalytic CO_(2) reduction,offering fundamental guidance for the actual photoreduction of diluted CO_(2) in the future.

关 键 词：diluted CO_(2) photocatalytic reduction oxygen vacancies NiO nanoplatelets ADSORPTION 

分 类 号：O64[理学—物理化学]