期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 263, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118333
关键词
Z-Scheme photocatalysis; WO3; H-2 evolution; CuCl; Charge carrier dynamics
资金
- Strategic Research Infrastructure Project of MEXT
- Cooperative Research Program of Institute for Catalysis, Hokkaido University [17A1001]
- [19H02820]
- [19H04708]
WO3 is one of the most popular materials for visible-light photocatalysts. However, its conduction band minimum is too low for water reduction. Here, we found that WO3 can assist water reduction by using visible light in a CuCl2 aqueous solution. Photoirradiation of WO3 in CuCl2 reduces Cu2+ to form indissoluble Cud adducts, and as-produced CuCl/WO3 was active for H-2 evolution under UV-light. This composite has very low reactivity under visible light ( > 400 nm), but visible-light assisted H-2 evolution was observed with simultaneous irradiation with UV light: the activity was increased similar to 1.7 fold. Transient absorption measurements revealed that Z-schematic recombination initially takes place between photogenerated electrons in WO3 and holes in CuCl. As a result, the lifetime of electrons in Cud was increased, enhancing H2 evolution. These results demonstrate that inactive narrow-band gap materials can be used to enhance the activity of wide-band gap materials under sunlight illumination.
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