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Volume 155, 2012
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Kinetics of light-driven oxygen evolution at α-Fe2O3 electrodes

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Abstract

The kinetics of light-driven oxygen evolution at polycrystalline α-Fe2O3 layers prepared by aerosol-assisted chemical vapour deposition has been studied using intensity modulated photocurrent spectroscopy (IMPS). Analysis of the frequency-dependent IMPS response gives information about the competition between the 4-electron oxidation of water by photogenerated holes and losses due to electron-hole recombination via surface states. The very slow kinetics of oxygen evolution indicates the presence of a kinetic bottleneck in the overall process. Surface treatment of the α-Fe2O3 with dilute cobalt nitrate solution leads to a remarkable improvement in the photocurrent response, but contrary to expectation, the results of this study show that this is not due to catalysis of hole transfer but is instead the consequence of almost complete suppression of surface recombination.

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Publication details

The article was received on 22 Apr 2011, accepted on 13 Jun 2011 and first published on 07 Jul 2011


Article type: Paper
DOI: 10.1039/C1FD00079A
Citation: Faraday Discuss., 2012,155, 309-322
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    Kinetics of light-driven oxygen evolution at α-Fe2O3 electrodes

    L. M. Peter, K. G. U. Wijayantha and A. A. Tahir, Faraday Discuss., 2012, 155, 309
    DOI: 10.1039/C1FD00079A

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