文献类型：期刊文献

英文题名：Exploring the enhancement effects of hetero-metal doping in CeO2 on CO2 photocatalytic reduction performance

作者：Wang, Min[1,2,3];Shen, Meng[1,2];Jin, Xixiong[1,2];Tian, Jianjian[1,2];Shao, Yiran[1,2];Zhang, Lingxia[1,2,4];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]Univ Chinese Acad Sci, Sch Chem & Mat Sci, Hangzhou Inst Adv Study, 1 Sub Lane Xiangshan, Hangzhou 310024, Peoples R China

年份：2022

卷号：427

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20212610575804);WOS:【SCI-EXPANDED(收录号:WOS:000729139100002)】；

基金：We acknowledge the financial supports from the National Key R&D Program of China (2017YFE0127400) , National Natural Science Foundation of China (51872317, 21835007, Shang-hai Municipal Government S&T Project (Grant No. 17JC1404701) .

语种：英文

外文关键词：CeO2; Photocatalysis; Metal doping; In-situ FTIR; CO2 reduction

摘要：Doping hetero-metal ions in semiconductors, especially metal oxides, is a common practice to elevate their photocatalytic reduction activity. However, the underlying enhancement mechanism of doping different metal ions into the host lattice on photocatalytic CO2 reduction has been rarely explored and thus remains unclear. In this work, CeO2 nanoparticles doped with three different metal ions (CeM, M = Y, La, Mo) have been synthesized, which exhibited significantly improved photo-reduction CO2 activity. According to the analysis of Electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), Y and Mo doping results in increased oxygen vacancy concentration in CeO2, which promotes the absorption of UV-visible light and the separation/ transfer of electrons and holes, consequently elevating the catalytic activity. More importantly, through in-situ FT-IR, CO2 adsorption/activation and the intermediates generated on catalyst surface during CO2 photoreduction reaction were investigated and discussed in-depth. Similar carbonates and hydrocarbonates, such as HCO3xfffd;, bCO32xfffd; and m-CO32 , have been found to be produced on CeO2 and CeM, while these intermediates accumulated and strongly covered on the catalyst surface have been revealed to be responsible for the gradually declined CO2 reduction activity and stability.