Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 40, Pages 16693-16700Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja306427f
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Funding
- National Science Foundation [CHE-1150378]
- Ministerio de Industria y Competitividad (MINECO) of Spain [CSD2007-00007]
- Generalitat Valenciana [PROMETEO/2009/058]
- Institute of Nanotechnologies for Clean Energies [ISIC/2012/008]
- University Jaume I- Bancaixa [P1.1B2011-50]
- MINECO of Spain under the Ramon y Cajal programme
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1150378] Funding Source: National Science Foundation
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Uniform thin films of hematite (alpha-Fe2O3) deposited by atomic layer deposition (ALD) coated with varying amounts of the cobalt phosphate catalyst, Co-Pi, were investigated with steady-state and transient photo-electrochemical measurements and impedance spectroscopy. Systematic studies as a function of Co-Pi thickness were performed in order to clarify the mechanism by which Co-Pi enhances the water-splitting performance of hematite electrodes. It was found that under illumination, the Co-Pi catalyst can efficiently collect and store photogenerated holes from the hematite electrode. This charge separation reduces surface state recombination which results in increased water oxidation efficiency. It was also found that thicker Co-Pi films produced increased water oxidation efficiencies which is attributed to a combination of superior charge separation and increased surface area of the porous catalytic film. These combined results provide important new understanding of the enhancement and limitations of the Co-Pi catalyst coupled with semiconductor electrodes for water-splitting applications.
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