期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 14, 页码 3066-3074出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201102966
关键词
photoelectrochemical water splitting; nanoparticles; catalysts; photostability; photoanodes
类别
资金
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Natural Science Foundation of China [21073090, 11174129, 50902068]
- National Basic Research Program of China [2011CB933303]
- Jiangsu Provincial Science and Technology Research Program [BK2011056]
Despite the fact that Ta3N5 absorbs a major fraction of the visible spectrum, the rapid decrease of photocurrent encountered in water photoelectrolysis over time remains a serious hurdle for the practical application of Ta3N5 photoelectrodes. Here, by employing a Co3O4 nanoparticle water oxidation catalyst (WOC) as well as an alkaline electrolyte, the photostability of Ta3N5 electrode is significantly improved. Co3O4/Ta3N5 photoanode exhibits the best durability against photocorrosion to date, when compared with Co(OH)x/Ta3N5 and IrO2/Ta3N5 photoanodes. Specifically, about 75% of the initial stable photocurrent remains after 2 h irradiation at 1.2 V vs. RHE (reversible hydrogen electrode). Meanwhile, a photocurrent density of 3.1 mA cm-2 has been achieved on Co3O4/Ta3N5 photoanode at 1.2 V vs. RHE with backside illumination under 1 sun AM 1.5 G simulated sunlight. The reason for the relatively high stability is discussed on the basis of electron microscopic observations and photoelectrochemical measurements, and the surface nitrogen content is monitored by X-ray photoelectron spectroscopic analysis.
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