期刊
CHEMCATCHEM
卷 14, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202201107
关键词
defective engineering; dual vacancies; metallic oxide; photocatalytic hydrogen generation; pollutants removal
资金
- National Natural Science Foundation of China
- Zhejiang Provincial Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Zhuhai Science and Technology Bureau
- [22006131]
- [22276171]
- [22106136]
- [LQ20B070010]
- [2020T130598]
- [2019M662106]
- [ZH22017003210025PWC]
The mechanism of Ti vacancies and O vacancies in TiO2 for photocatalytic hydrogen production was investigated. It was found that TiO2 with both O vacancies and Ti vacancies showed the highest photocatalytic hydrogen production. O vacancies acted as emitters for electron migration and provided adsorption sites for water molecules, while Ti vacancies served as electron traps for hydrogen proton reduction. This study provides insights for the development of efficient non-precious metal catalysts for photocatalytic hydrogen production.
The mechanism of TiO2 with Ti vacancy and O vacancy in photocatalytic hydrogen production is unknown. Herein, TiO2 with three types of vacancies was constructed. It was found that DV-Ti-3O containing both O vacancies and Ti vacancies had the highest photocatalytic hydrogen production of 12.42 mmol.g(-1).h(-1) twice that of SV-Ti, where the O vacancy acted as an emitter providing a directional path for the migration of photogenerated electrons and provided the adsorption sites for water molecules, while the introduction of Ti vacancies took the role as electron traps to collect more electrons for hydrogen proton reduction. DV-Ti-3O achieved ultra-fast migration of electronics from O vacancies to Ti vacancies and created ideas for defective engineering of non-precious metal catalysts for photocatalytic hydrogen production and organic pollutants removal.
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