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Photoelectrochemical Water Oxidation by Cobalt Catalyst (“Co−Pi”)/α-Fe2O3 Composite Photoanodes: Oxygen Evolution and Resolution of a Kinetic Bottleneck
Abstract
A cobalt-phosphate water oxidation catalyst ("Co-Pi") has been electrodeposited onto mesostructured alpha-Fe(2)O(3) 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-Fe(2)O(3). Relative to alpha-Fe(2)O(3) 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-Fe(2)O(3) 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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Cited by
Walter, M. G., Warren, E. L., McKone, J. R., Boettcher, S. W., Mi, Q., Santori, E. A., & Lewis, N. S. (2010) · Chemical Reviews · doi:10.1021/cr1002326 · Cited by 9,388
Earth-abundant catalysts for electrochemical and photoelectrochemical water splitting
Roger, I., Shipman, M. A., & Symes, M. D. (2017) · Nature Reviews Chemistry · doi:10.1038/s41570-016-0003 · Cited by 3,503
Roles of Cocatalysts in Photocatalysis and Photoelectrocatalysis
Yang, J., Wang, D., Han, H., & Li, C. (2013) · Accounts of Chemical Research · doi:10.1021/ar300227e · Cited by 2,848
Anantharaj, S., Ede, S. R., Sakthikumar, K., Karthick, K., Mishra, S., & Kundu, S. (2016) · ACS Catalysis · doi:10.1021/acscatal.6b02479 · Cited by 2,503
The Mechanism of Water Oxidation: From Electrolysis via Homogeneous to Biological Catalysis
Dau, H., Limberg, C., Reier, T., Risch, M., Roggan, S., & Strasser, P. (2010) · ChemCatChem · doi:10.1002/cctc.201000126 · Cited by 1,783
Metadata
- Authors
- Zhong, D. K., & Gamelin, D. R.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-03-04
- Volume
- 132
- Issue
- 12
- Pages
- 4202-4207
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2013394816
- Cited by
- 648
- References
- 0
- FWCI
- 25.65
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhong, D. K., & Gamelin, D. R. (2010). Photoelectrochemical Water Oxidation by Cobalt Catalyst (“Co−Pi”)/α-Fe2O3 Composite Photoanodes: Oxygen Evolution and Resolution of a Kinetic Bottleneck. Journal of the American Chemical Society. https://doi.org/10.1021/ja908730h
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