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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Publisher
Wiley
Subject
Multidisciplinary chemistry
Citation
Has Part
Source
Angewandte Chemie
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Edition
DOI
10.1002/anie.201402311