期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 30, 页码 16776-16783出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c04208
关键词
-
资金
- Ministry of Science and Technology, Taiwan [MOST-107-2221-E-006-187-MY3, MOST-107-2112-M-006023-MY3, 107-2221-E-218-012-MY3]
The study employed nickel oxide decoration on a p-n junction GaN photoanode prepared using a thermally annealed nickel film on a p-GaN surface layer, leading to increased photocurrent density and reduced photocorrosion.
Photoelectrochemical water splitting is a promising method of generating solar fuels. However, the direct solar-to-fuel approach has several critical issues on the photoelectrodes, such as bulk recombination, sluggish surface reaction kinetics, and photocorrosion. In this study, the photoanodes were prepared using a GaN p-n junction (p-n GaN) with the decoration of nickel oxide formed by the thermally annealed nickel film on the p-GaN surface layer. The surface p-n junction enhances the charge separation of the p-n GaN photoanodes, thereby increasing the photocurrent density as well as providing a higher photovoltage. The nickel oxide catalysts placed on the pn-GaN photoanodes lowered the activation energy and provided a facile route for the photogenerated holes to participate in water oxidation. As a result, the nickel oxide-decorated p-n junction GaN photoanodes exhibit a stable photocurrent density with negligible photocorrosion during the photoelectrochemical reactions.
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