期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 10, 页码 3047-3051出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201409906
关键词
cocatalysts; interface engineering; photocatalysis; tantalum nitride; water splitting
资金
- Basic Research Program of China (973 Program) [2014CB239403]
- National Natural Science Foundation of China [21361140346, 21373210]
Cocatalysts have been extensively used to promote water oxidation efficiency in solar-to-chemical energy conversion, but the influence of interface compatibility between semiconductor and cocatalyst has been rarely addressed. Here we demonstrate a feasible strategy of interface wettability modification to enhance water oxidation efficiency of the state-of-the-art CoOx/Ta3N5 system. When the hydrophobic feature of a Ta3N5 semiconductor was modulated to a hydrophilic one by insitu or exsitu surface coating with a magnesia nanolayer (2-5nm), the interfacial contact between the hydrophilic CoOx cocatalyst and the modified hydrophilic Ta3N5 semiconductor was greatly improved. Consequently, the visible-light-driven photocatalytic oxygen evolution rate of the resulting CoOx/MgO(in)-Ta3N5 photocatalyst is ca. 23 times that of the pristine Ta3N5 sample, with a new record (11.3%) of apparent quantum efficiency (AQE) under 500-600nm illumination.
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