Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 12, Pages 4202-4207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja908730h
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Funding
- ACS-PRF (AC)
- NSF [DGE-050-4573]
- University of Washington
- UW Initiative Fund (UIF)
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A cobalt-phosphate water oxidation catalyst (Co-Pi) has been electrodeposited onto mesostructured alpha-Fe2O3 photoanodes. The photoelectrochemical properties of the resulting composite photoanodes were optimized for solar water oxidation under frontside illumination in pH 8 electrolytes. A kinetic bottleneck limiting the performance of such photoanodes was identified and shown to be largely overcome by more sparse deposition of Co-Pi onto the alpha-Fe2O3. Relative to alpha-Fe2O3 photoanodes, a sustained 5-fold enhancement in the photocurrent density and O-2 evolution rate was observed at +1.0 V vs RHE with the Co-Pi/alpha-Fe2O3 composite photoanodes. These results demonstrate that integration of this promising water oxidation catalyst with a photon-absorbing substrate can provide a substantial reduction in the external power needed to drive the catalyst's electrolysis chemistry.
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