Journal
APPLIED SURFACE SCIENCE
Volume 506, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145021
Keywords
Pt/TiO2; Bulk oxygen vacancy; Surface oxygen vacancy; Defect migration; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21677049, 21876051]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available