文献类型：期刊文献

英文题名：Surface oxygen vacancies enriched Pt/TiO2 synthesized with a defect migration strategy for superior photocatalytic activity

作者：Qiu, Huan[1,2];Ma, Xujun[1,2];Sun, Chunyu[1,2];Zhao, Bin[3];Chen, Feng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Shenzhen Univ, Coll Mat Sci & Engn, 1066 Xueyuan Ave, Shenzhen 518055, Peoples R China

年份：2020

卷号：506

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20195107852071);WOS:【SCI-EXPANDED(收录号:WOS:000512983600064)】；

基金：This work was supported by the National Natural Science Foundation of China (21677049, 21876051).

语种：英文

外文关键词：Pt/TiO2; Bulk oxygen vacancy; Surface oxygen vacancy; Defect migration; Photocatalysis

摘要：Surface oxygen vacancies (Ovs) may act as growth centers for Pt nanoparticles (NPs) and stabilize Pt NPs to avoid spontaneous aggregation, which practically improves the photocatalytic activity of Pt/TiO2. In this work, a defect migration strategy is developed; that is, the number of surface Ovs on Pt/TiO2 is effectively increased by migrating bulk Ovs to the surface through a vacuum annealing process. The Ov-enriched surface of Pt/TiO2 increases the proportion of active Pt species (Pt-0 and Pt-OH), thus greatly facilitating the photocatalytic activity of the catalyst under visible-light irradiation. Specifically, the apparent rate constant for the typical sample of Pt-Ovs/Ti3+/TiO2 (PVTT) prepared with the defect migration strategy is about 4.44 times as much as that for the control sample (Pt-TiO2) without the contribution of Ovs.