期刊
NANO LETTERS
卷 13, 期 5, 页码 2064-2072出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl400343a
关键词
Solar water oxidation; electrocatalyst; nanotextured Si
类别
资金
- DOE [DE-FG36-08G018016]
- NSF [ARRA-ECCS0901113, CBET1236155]
- UCSD Academic Senate Research Award
- ONR-DURIP [N00014-08-1-0776]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1236155] Funding Source: National Science Foundation
We present a study of a transition metal oxide composite modified n-Si photoanode for efficient and stable water oxidation. This sputter-coated composite functions as a protective coating to prevent Si from photodecomposition, a Schottky heterojunction, a hole conducting layer for efficient charge separation and transportation, and an electrocatalyst to reduce the reaction overpotential. The formation of mixed-valence oxides composed of Ni and Ru effectively modifies the optical, electrical, and catalytic properties of the coating material, as well as the interfaces with Si. The successful application of this oxide composite on nanotextured Si demonstrates improved conversion efficiency due to enhanced catalytic activity, minimized reflection, and increased surface reaction sites. Although the coated nanotextured Si shows a noticeable degradation from 500 cycles of operation, the oxide composite provides a simple method to enable unstable photoanode materials for solar fuel conversion.
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