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Title: Kinetics of oxygen evolution at alpha-Fe2O3 photoanodes: a study by photoelectrochemical impedance spectroscopy
Authors: Wijayantha, K.G.U.
Saremi-Yarahmadi, Sina
Peter, Laurence M.
Issue Date: 2011
Publisher: © Royal Society of Chemistry
Citation: WIJAYANTHA, K.G.U., SAREMI-YARAHMADI, S. and PETER, L.M., 2011. Kinetics of oxygen evolution at alpha-Fe2O3 photoanodes: a study by photoelectrochemical impedance spectroscopy. Physical Chemistry Chemical Physics, 13 (12), pp. 5264 - 5270.
Abstract: Photoelectrochemical Impedance Spectroscopy (PEIS) has been used to characterize the kinetics of electron transfer and recombination taking place during oxygen evolution at illuminated polycrystalline α-Fe2O3 electrodes prepared by aerosol-assisted chemical vapour deposition from a ferrocene precursor. The PEIS results were analysed using a phenomenological approach since the mechanism of the oxygen evolution reaction is not known a priori. The results indicate that the photocurrent onset potential is strongly affected by Fermi level pinning since the rate constant for surface recombination is almost constant in this potential region. The phenomenological rate constant for electron transfer was found to increase with potential, suggesting that the potential drop in the Helmholtz layer influences the activation energy for the oxygen evolution process. The PEIS analysis also shows that the limiting factor determining the performance of the α-Fe2O3 photoanode is electron–hole recombination in the bulk of the oxide.
Description: Closed access. This article was published in the journal, Physical Chemistry Chemical Physics [© Royal Society of Chemistry] and the definitive version is available at: http://dx.doi.org/10.1039/C0CP02408B
Sponsor: EPSRC and Loughborough University Materials Research School
Version: Published
DOI: 10.1039/c0cp02408b
URI: https://dspace.lboro.ac.uk/2134/15780
Publisher Link: http://dx.doi.org/10.1039/c0cp02408b
ISSN: 1463-9076
Appears in Collections:Closed Access (Chemistry)

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