文献类型：期刊文献

英文题名：Oxygen Vacancy Generation and Stabilization in CeO2-x by Cu Introduction with Improved CO2 Photocatalytic Reduction Activity

作者：Wang, Min[1,2,3];Shen, Meng[1,2];Jin, Xixiong[1,2];Tian, Jianjian[1,2];Li, Mengli[4];Zhou, Yajun[3];Zhang, Lingxia[1,2];Li, Yongsheng[3];Shi, Jianlin[1,2]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 1295 Ding Xi Rd, Shanghai 200050, Peoples R China;[2]Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, 19A Yuquan Rd, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]Jiaxing Univ, Sch Biol & Chem Engn, 56 South Yuexiu Rd, Jiaxing 314001, Zhejiang, Peoples R China

年份：2019

卷号：9

期号：5

起止页码：4573

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20192006912193);WOS:【SCI-EXPANDED(收录号:WOS:000467335600081)】；

基金：We acknowledge the financial support from the National Natural Science Foundation of China (51872317 and 21835007).

语种：英文

外文关键词：photocatalysis; CeO2; CO2 reduction; Cu introduction; oxygen vacancy

摘要：Introducing O vacancies into the lattice of a semiconductor photocatalyst can alter its intrinsic electronic properties and band gap, thus enhancing the visible light absorption, promoting the separation/transfer of photogenerated charge carriers, and resultantly elevating the photocatalytic activity of oxide semiconductors. Moreover, O vacancies can help adsorb and activate CO2 on photocatalyst surfaces, which, however, are prone to being filled by O atoms during the photoreduction reaction. In this work, Cu was introduced to increase the O vacancy concentration in CeO2-x and promote the photocatalytic activity of CeO2-x The sample Cu/CeO2-x -0.1 showed the highest photocatalytic activity with a CO yield of 8.25 mu mol g(-1) under 5 h irradiation, which is similar to 26 times that on CeO2-x. According to the analysis of Raman and X-ray photoelectron spectroscopy (XPS) spectra, it has been evidenced that Cu introduction benefits the chemical stabilization of O vacancies in CeO2-x during photocatalytic CO2 reduction, which is responsible for the improved and sustained photocatalytic activity.