期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 18, 页码 4897-4901出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201711761
关键词
chalcogens; electrochemistry; electrochromism; hydrogen evolution; viologens
资金
- Natural Science Foundation of China [21704081]
- National 1000-Plan program
- Cyrus Chung Ying Tang Foundation
- Xi'an Jiaotong University
A series of electron-accepting chalcogen-bridged viologens with narrow HOMO-LUMO bandgaps and low LUMO levels is reported. The optoelectronic properties of chalcogenoviologens can be readily tuned through heavy atom substitution (S, Se and Te). Herein, insitu electrochemical spectroscopy was performed on the proof-of-concept electrochromic devices (ECD). E-BnV2+ (E=Se, Te; BnV2+=benzyl viologen) was used for the visible-light-driven hydrogen evolution due to the strong visible-light absorption. Remarkably, E-BnV2+ was not only used as a photosensitizer, but also as an electron mediator, providing a new strategy to explore photocatalysts. The higher apparent quantum yield of Se-BnV2+ could be interpreted in terms of different energy levels, faster electron-transfer rates and faster formation of radical species.
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