期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 4, 期 5, 页码 1759-1764出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee01034d
关键词
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资金
- NSF (IGERT) [DGE-050-4573]
- Swiss Federal Office of Energy, PEC-House [102326]
- University of Washington
- UW Initiative Fund (UIF)
- Sun Catalytix
A photo-assisted electrodeposition approach was used to deposit a cobalt-phosphate water oxidation catalyst (Co-Pi) onto recently improved dendritic mesostructures of alpha-Fe2O3. A comparison between this approach, electrodeposition of Co-Pi, and Co2+ wet impregnation showed that photo-assisted electrodeposition of Co-Pi yields superior alpha-Fe2O3 photoanodes for photoelectrochemical water oxidation. Stable photocurrent densities of 1.0 mA cm(-2) at 1.0 V and 2.8 mA cm(-2) at 1.23 V vs. RHE measured under standard illumination and basic conditions were achieved. By allowing deposition only where visible light generates oxidizing equivalents, photo-assisted electrodeposition provides a more uniform distribution of Co-Pi onto alpha-Fe2O3 than obtained by electrodeposition. This approach of fabricating catalyst-modified metal-oxide photoelectrodes may be attractive for optimization in conjunction with tandem or hybrid photoelectrochemical cells.
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