Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 28, Pages 7295-7299Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201404697
Keywords
electrochemistry; ferrihydrite; photochemistry; tantalum nitride; water splitting
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Funding
- 973 National Basic Research Program of the Ministry of Science and Technology [2014CB239400]
- National Natural Science Foundation of China [21090340, 21373210]
- Hundred Talents Program of the Chinese Academy of Sciences
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Photoelectrochemical (PEC) water splitting is an ideal approach for renewable solar fuel production. One of the major problems is that narrow bandgap semiconductors, such as tantalum nitride, though possessing desirable band alignment for water splitting, suffer from poor photostability for water oxidation. For the first time it is shown that the presence of a ferrihydrite layer permits sustainable water oxidation at the tantalum nitride photoanode for at least 6 h with a benchmark photocurrent over 5 mAcm(-2), whereas the bare photoanode rapidly degrades within minutes. The remarkably enhanced photostability stems from the ferrihydrite, which acts as a hole-storage layer. Furthermore, this work demonstrates that it can be a general strategy for protecting narrow bandgap semi-conductors against photocorrosion in solar water splitting.
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