期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 10, 页码 2980-2985出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201411200
关键词
charge separation; photocatalysis; semiconductors; silicon; surface chemistry
资金
- 973 Program [2014CB848900]
- NSFC [91123010, 21471141, 21101145, 21473166]
- Recruitment Program of Global Experts
- CAS Hundred Talent Program
- Specialized Research Fund for the Doctoral Program of Higher Education [20123402110050]
- Fundamental Research Funds for the Central Universities [WK2060190025, WK2310000035]
- Beijing National Laboratory for Molecular Sciences [2013002]
Silicon should be an ideal semiconductor material if it can be proven usable for photocatalytic water splitting, given its high natural abundance. Thus it is imperative to explore the possibility of water splitting by running photocatalysis on a silicon surface and to decode the mechanism behind it. It is reported that hydrogen gas can indeed be produced from Si nanowires when illuminated in water, but the reactions are not a real water-splitting process. Instead, the production of hydrogen gas on the Si nanowires occurs through the cleavage of SiH bonds and the formation of SiOH bonds, resulting in the low probability of generating oxygen. On the other hand, these two types of surface dangling bonds both extract photoexcited electrons, whose competition greatly impacts on carrier lifetime and reaction efficiency. Thus surface chemistry holds the key to achieving high efficiency in such a photocatalytic system.
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