文献类型：期刊文献

英文题名：Oxygen vacancy mediated bismuth stannate ultra-small nanoparticle towards photocatalytic CO2-to-CO conversion

作者：Guo, Shasha[1];Di, Jun[1];Chen, Chao[1];Zhu, Chao[1];Duan, Meilin[2];Lian, Cheng[3];Ji, Mengxia[4];Zhou, Weiqiang[5];Xu, Manzhang[1];Song, Pin[1];Long, Ran[2];Cao, Xun[1];Gu, Kaizhi[3];Xia, Jiexiang[4];Liu, Honglai[3];Zhao, Yanli[5];Song, Li[2];Xiong, Yujie[2];Li, Shuzhou[1];Liu, Zheng[1]

机构：[1]Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore;[2]Univ Sci & Technol China, CAS Ctr Excellence Nanosci, Sch Chem & Mat Sci, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Jiangsu Univ, Sch Chem & Chem Engn, Inst Energy Res, 301 Xuefu Rd, Zhenjiang 212013, Peoples R China;[5]Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, 21 Nanyang Link, Singapore 637371, Singapore

年份：2020

卷号：276

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20202208759570);WOS:【SCI-EXPANDED(收录号:WOS:000549171400021)】；

基金：This work was financially supported by Singapore National Research Foundation under NRF RF Award No. MOE2016-T2-1-131, Tier 1 2017-T1-001-075, MOE2018-T3-1-002. National Key R&D Program of China (2017YFA0207301), NSFC (21725102, U1832156). The computational work for this article was carried out on National Supercomputing Centre, Singapore (https://www.nscc.sg).

语种：英文

外文关键词：Bi2Sn2O7; Oxygen vacancy; Photocatalytic; CO(2)reduction

摘要：Photocatalytic CO2 reduction suffers from the weakness of high energy barrier, low efficiency and poor selectivity. Exploring effective strategy to enhance the adsorption and activation behavior of CO2 molecules is an alternative approach to boost CO2 photoreduction performance. In this work, abundant oxygen vacancies (V-O) are introduced onto Bi2Sn2O7 nanoparticles (NPs) by decreasing their size down to about 4 nm. The V-O mediated NPs exhibit a tremendous 8.1 times enhanced performance than the bulk counterpart towards CO2-to-CO conversion in pure water. This is attributed to fast charge diffusion and abundant Vo for effective CO2 adsorption and activation in the ultra-small nanoparticles. The V-O mediated Bi2Sn2O7 NPs have electron back donation nature and optimized electronic structure for effectively activating CO2, which were demonstrated by density functional theory calculations. During the reduction process, the Vo can effeciently stabilize the COOH* intermediates, and also lower the energy barrier of CO desorption determining step.