文献类型：期刊文献

英文题名：Ultra-fast construction of plaque-like Li2TiO3/TiO2 heterostructure for efficient gas-solid phase CO2 photoreduction

作者：Bi, Wei[1];Hu, Yanjie[1];Jiang, Nan[1];Zhang, Ling[1];Jiang, Hao[1];Zhao, Xing[1];Wang, Chengyun[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2020

卷号：269

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

收录：;EI(收录号：20200908234571);WOS:【SCI-EXPANDED(收录号:WOS:000532683200056)】；

基金：This work was supported by the National Natural Science Foundation of China (21978088, 91534202, 51673063), Sponsored by the Shanghai Pujiang Program (18PJ1402100), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutes of High Learning, the Basic Research Program of Shanghai (17JC1402300), the Social Development Program of Shanghai (17DZ1200900), the Shanghai City Board of education research and innovation project, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Ultra-fast reaction process; Ultra-high temperature; Plaque-like Li2TiO3/TiO2 heterostructure; Photocatalytic CO2 reduction; Catalytic behavior and mechanism

摘要：Exploring a facile and universal strategy to fabricate an efficient heterostructure is a big challenge for achieving highly active and selective CO2 photoreduction. Herein, a plaque-like Li2TiO3/TiO2 heterostructure was in-situ constructed by the gradual intercalation of Li ions into the lattice of TiO2 from the outside and eventually formed the Li2TiO3 phase on the surface of TiO2 in an ultra-high temperature about 2000 K within several milliseconds. This novel structure has a significant improvement in the adsorption capacity of CO2 and reduction of the oxygen defect trap by introduction of Li species. Furthermore, owing to the built-in electric field directed from Li2TiO3 to TiO2, electrons are forced to move to the oxygen atom sites in Li2TiO3, which helps the plaque-like Li2TiO3/TiO2 heterostructure photocatalyst achieve nearly 3 times performance improvement with about 100 % selectivity towards CO. Theoretically and experimentally, we proposed a possible catalytic behavior and mechanism that Li2TiO3/TiO2 heterostructure will choose a shorter pathway through intermediate formate conversion to CO, as the free energy reduce by 26.53 % from 0.98 eV to 0.72 eV. This work gives a new insight for constructing heterostructure in an ultra-fast reaction process, and provides a rational reference for developing highly efficient photocatalysts towards CO2 reduction.