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Angew Chem Int Ed Engl. 2014 Jul 7;53(28):7169-72. doi: 10.1002/anie.201402311. Epub 2014 May 28.

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

Author information

1
Joint Center for Artificial Photosynthesis (JCAP) Energy Innovation Hub, LBNL, 1 Cyclotron Road, MS 976-JCAP, Berkeley, CA 94720 (USA).

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.

KEYWORDS:

X-ray photoelectron spectroscopy; electrochemistry; heterogeneous catalysis; iridium oxide; oxygen evolution reaction

PMID:
24889896
DOI:
10.1002/anie.201402311

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