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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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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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Article information

22 Apr 2011
13 Jun 2011
First published
07 Jul 2011

Faraday Discuss., 2012,155, 309-322
Article type

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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