The Role of Cobalt Phosphate in Enhancing the Photocatalytic Activity of α-Fe<sub>2</sub>O<sub>3</sub> toward Water Oxidation
Mónica BarrosoDepartment of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United KingdomAlexander J. CowanDepartment of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United KingdomStephanie R. PendleburyDepartment of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United KingdomMichaël GrätzelInstitut des Sciences et Ingenierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, SwitzerlandDavid R. KlugDepartment of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United KingdomJames R. DurrantDepartment of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
2011en
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Transient absorption spectroscopy was used to probe the dynamics of photogenerated charge carriers in α-Fe(2)O(3)/CoO(x) nanocomposite photoelectrodes for water splitting. The addition of cobalt-based electrocatalysts was observed to increase the lifetime of photogenerated holes in the photoelectrode by more than 3 orders of magnitude without the application of electrical bias. We therefore propose that the enhanced photoelectrochemical activity of the composite electrode for water photooxidation results, at least in part, from reduced recombination losses because of the formation of a Schottky-type heterojunction.
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