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Effect of a Cobalt-Based Oxygen Evolution Catalyst on the Stability and the Selectivity of Photo-Oxidation Reactions of a WO3 Photoanode
Abstract
A bare WO 3 electrode and a WO 3 electrode coupled with a layer of Co−Pi oxygen evolution catalyst (OEC) were prepared to investigate the effect of Co−Pi OEC on the selectivity of photo-oxidation reactions and photostabilities of WO 3 photoanodes. WO 3 photoanodes have been reported to produce peroxo species as well as O 2 during photo-oxidation reactions, and the accumulation of peroxo species on the surface is known to cause a gradual loss of photoactivity of WO 3 . The photocurrent to O 2 conversion efficiencies of the WO 3 and WO 3 /Co−Pi OEC electrodes were obtained by simultaneously measuring the photocurrent and O 2 gas generated during illumination at 0.8 V vs Ag/AgCl. The result shows that the presence of OEC increases the photocurrent to O 2 conversion efficiency from approximately 61% to approximately 100%. The complete suppression of peroxo formation provided the WO 3 /Co−Pi OEC photoelectrode with long-term photostability. The photocurrent−potential characteristics show that the presence of OEC effectively reduces the electron−hole recombination near the flat band potential region and shifts the onset potential of photocurrent by 0.17 V to the negative direction. However, when the applied potential became more positive than approximately 0.35 V vs Ag/AgCl, the WO 3 /Co−Pi OEC electrode produced less initial photocurrent than the bare WO 3 electrode. Mott−Schottky plots reveal the presence of interface states at the WO 3 /OEC junction that induce more electron−hole recombination when the Fermi level moves below these states. Regardless of the adverse effect on recombination present at 0.8 V vs Ag/AgCl, the WO 3 /Co−Pi OEC achieved a more efficient and sustainable solar to O 2 conversion owing to the ability of Co−Pi OEC to significantly increase the photocurrent to O 2 conversion efficiency and prevent the photocurrent decay of the WO 3 electrode.
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Metadata
- Authors
- Seabold, J. A., & Choi, K.-S.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-01-19
- Volume
- 23
- Issue
- 5
- Pages
- 1105-1112
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2321309470
- Cited by
- 600
- References
- 19
- FWCI
- 20.75
- Type
- journal article
- Language
- en
- Open access
- closed
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