Publication:
In situ observation of surface species on iridium oxide nanoparticles during the oxygen evolution reaction

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Casalongue, Hernan G. Sanchez
Ng, May Ling
Friebel, Daniel
Ogasawara, Hirohito
Nilsson, Anders

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NO

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Abstract

An iridium oxide nanoparticle electrocatalyst under oxygen evolution reaction conditions was probed in situ by ambient-pressure X-ray photoelectron spectroscopy. Under OER conditions, iridium undergoes a change in oxidation state from Ir-IV to Ir-V that takes place predominantly at the surface of the catalyst. The chemical change in iridium is coupled to a decrease in surface hydroxide, providing experimental evidence which strongly suggests that the oxygen evolution reaction on iridium oxide occurs through an OOH-mediated deprotonation mechanism.

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Wiley

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Multidisciplinary chemistry

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Angewandte Chemie

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DOI

10.1002/anie.201402311

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