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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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Supplementary files

Article information


Submitted
02 Apr 2014
Accepted
19 May 2014
First published
19 May 2014

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2014,5, 3591-3597
Article type
Edge Article

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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