Kinetics and mechanism of light-driven oxygen evolution at thin film α-Fe2O3 electrodes

Charles Y. Cummings; Frank Marken; Laurence M. Peter; Asif A. Tahir; K. G. Upul Wijayantha

doi:10.1039/C2CC16382A

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Kinetics and mechanism of light-driven oxygen evolution at thin film α-Fe₂O₃ electrodes†‡

Charles Y. Cummings,^a Frank Marken,^a Laurence M. Peter,*^a Asif A. Tahir^b and K. G. Upul Wijayantha^b

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* Corresponding authors

^a Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
E-mail: l.m.peter@bath.ac.uk

^b Department of Chemistry, Loughborough University, Loughborough LE11 3TU, UK
E-mail: U.Wijayantha@lboro.ac.uk

Abstract

Rate constants for recombination and hole transfer during oxygen evolution at illuminated α-Fe₂O₃ electrodes were measured by intensity-modulated photocurrent spectroscopy and found to be remarkably low. Treatment of the electrode with a Co(II) solution suppressed surface recombination but did not catalyse hole transfer. Intermediates in the reaction were detected spectroscopically.

This article is part of the themed collection: Artificial Photosynthesis

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Article information

DOI: https://doi.org/10.1039/C2CC16382A
Article type: Communication
Submitted: 13 Oct 2011
Accepted: 16 Dec 2011
First published: 20 Dec 2011

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Chem. Commun., 2012,48, 2027-2029

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Kinetics and mechanism of light-driven oxygen evolution at thin film α-Fe₂O₃ electrodes

C. Y. Cummings, F. Marken, L. M. Peter, A. A. Tahir and K. G. U. Wijayantha, Chem. Commun., 2012, 48, 2027 DOI: 10.1039/C2CC16382A

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