Journal
NANOSCALE
Volume 4, Issue 15, Pages 4430-4433Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr30862b
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Funding
- MOE ACRF Tier 1
- Centre of Artificial Photosynthesis
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A simple and inexpensive method to form a hematite photoanode for efficient water oxidation is reported. A very thin ZnO overlayer was deposited on top of a thin film of hematite and found, compared with non-treated hematite, to increase the photocurrent and reduce the onset potential for generating oxygen from water. After 3 cycles of ZnAc treatment, the photocurrent increased more than 40% to 1.08 mA cm(-2) at 0.23 V vs. Ag/AgCl and onset potential for water oxidation shifted by -170 mV. It is proposed that the ZnO overlayer changes the flat band potential of hematite and reduces the surface defects.
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