期刊
CHEMSUSCHEM
卷 6, 期 10, 页码 2009-2015出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300409
关键词
charge transfer; copper; hydrogen; photochemistry; water splitting
资金
- 973 program [2013CB632402]
- 863 Program [2012AA062701]
- NSFC [51102190, 51072154, 51272199]
- Fundamental Research Funds for the Central Universities [2013-VII-030]
- Self-determined and Innovative Research Funds of SKLWUT [2013-ZD-1]
- Australian Research Council (ARC) through the Discovery Project program [DP1095861, DP130104459]
Copper modification is an efficient way to enhance the photocatalytic activity of ZnS-based materials; however, the mechanisms of Cu2+ surface and bulk modifications for improving the activity are quite different. In this work, two different synthetic pathways were devised to prepare surface and bulk Cu2+-modified ZnxCd1-xS photocatalysts through cation-exchange and coprecipitation methods, respectively. Different Cu2+ modifications brought different effects on the phase structure, morphology, surface area, optical property, as well as the photocatalytic H-2-production activity of the final products. The optimized Cu2+-surface-modified ZnxCd1-xS photocatalyst has a high H-2-production rate of 4638.5molh(-1)g(-1) and an apparent quantum efficiency of 20.9% at 420nm, exceeding that of Cu2+-bulk-modified catalyst at the same copper content. Cu2+ surface modification not only brings a new electron-transferring pathway (interfacial charge transfer), but also produces new surface active sites for H-2 evolution, reducing the recombination rate of photogenerated charge carriers.
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