Kinetics of light-driven oxygen evolution at alpha-Fe2O3 electrodes

Laurence M Peter, K G U Wijayantha, A A Tahir

Research output: Contribution to journalArticlepeer-review

268 Citations (SciVal)
327 Downloads (Pure)


The kinetics of light-driven oxygen evolution at polycrystalline alpha-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 alpha-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.
Original languageEnglish
Pages (from-to)309-322
Number of pages14
JournalFaraday Discussions
Publication statusPublished - 2012


Dive into the research topics of 'Kinetics of light-driven oxygen evolution at alpha-Fe2O3 electrodes'. Together they form a unique fingerprint.

Cite this