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In Situ Observation of Surface Species on Iridium Oxide Nanoparticles during the Oxygen Evolution Reaction
Author(s) -
Sanchez Casalongue Hernan G.,
Ng May Ling,
Kaya Sarp,
Friebel Daniel,
Ogasawara Hirohito,
Nilsson Anders
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201402311
Subject(s) - iridium , electrocatalyst , x ray photoelectron spectroscopy , catalysis , oxygen evolution , chemistry , deprotonation , oxide , nanoparticle , oxygen , photochemistry , inorganic chemistry , reaction mechanism , materials science , chemical engineering , electrochemistry , nanotechnology , organic chemistry , ion , electrode , engineering
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.