Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co–Pi”-Coated Hematite Electrodes
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Other documents of the author: Klahr, Benjamin; Giménez Juliá, Sixto; Fabregat-Santiago, Francisco; Bisquert, Juan; Hamann, Thomas
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co–Pi”-Coated Hematite ElectrodesAuthor (s)
Date
2012Publisher
American Chemical SocietyISSN
0002-7863Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/ja306427fVersion
info:eu-repo/semantics/submittedVersionSubject
Abstract
Uniform thin films of hematite (α-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 photoelect ... [+]
Uniform thin films of hematite (α-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 photoelectrochemical 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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Journal of the American Chemical Society, 134, 40Rights
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for
publication in Journal of The American Chemical Society, copyright © American Chemical Society after peer review.
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