Loughborough University
Browse

File(s) under permanent embargo

Reason: This item is currently closed access.

Kinetics of oxygen evolution at alpha-Fe2O3 photoanodes: a study by photoelectrochemical impedance spectroscopy

journal contribution
posted on 2014-09-04, 14:25 authored by Upul Wijayantha-Kahagala-Gamage, Sina Saremi-YarahmadiSina Saremi-Yarahmadi, Laurence M. Peter
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.

Funding

EPSRC and Loughborough University Materials Research School

History

School

  • Science

Department

  • Chemistry

Published in

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Volume

13

Issue

12

Pages

5264 - 5270 (7)

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.

Publisher

© Royal Society of Chemistry

Version

  • VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2011

Notes

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

ISSN

1463-9076

Language

  • en

Usage metrics

    Loughborough Publications

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC