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Issue 9, 2014
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Observing the oxidation state turnover in heterogeneous iridium-based water oxidation catalysts

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Abstract

In this work the oxidation states assumed by Ir in oxide systems used as heterogeneous catalysts for water oxidation are determined by means of in situ X-ray Absorption Spectroscopy (XAS). Using a highly hydrated iridium oxide film allows the maximum number of Ir sites to be involved in the electrochemical processes occurring at the catalysts during water oxidation (oxygen evolution reaction, OER). X-ray Absorption Near Edge Structure (XANES) spectra clearly indicate the co-existence of Ir(III) and Ir(V) at the electrode potentials where OER occurs. This represents a fundamental step both in the understanding of the water oxidation mechanism catalysed by heterogeneous Ir oxide systems, and in the possible tailoring of electrocatalysts for OER.

Graphical abstract: Observing the oxidation state turnover in heterogeneous iridium-based water oxidation catalysts

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Publication details

The article was received on 02 Apr 2014, accepted on 19 May 2014 and first published on 19 May 2014


Article type: Edge Article
DOI: 10.1039/C4SC00975D
Chem. Sci., 2014,5, 3591-3597
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Observing the oxidation state turnover in heterogeneous iridium-based water oxidation catalysts

    A. Minguzzi, O. Lugaresi, E. Achilli, C. Locatelli, A. Vertova, P. Ghigna and S. Rondinini, Chem. Sci., 2014, 5, 3591
    DOI: 10.1039/C4SC00975D

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