In Situ Observation of Surface Species on Iridium Oxide Nanoparticles during the Oxygen Evolution Reaction1. (28th May 2014)

• Record Type: Journal Article
• Authors: Sanchez Casalongue, Hernan G.; Ng, May Ling; Kaya, Sarp; Friebel, Daniel; Ogasawara, Hirohito; Nilsson, Anders
• Is Part Of: Angewandte Chemie. Volume 126:Number 28(2014)
• Page Start: 7297
• Page End: 7300
• Publication Date: 2014-05-28
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201402311
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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.</p> </abstract>