铱
电催化剂
X射线光电子能谱
催化作用
化学
析氧
脱质子化
光化学
原位
无机化学
氧化物
化学工程
反应机理
纳米颗粒
材料科学
氢氧化物
氧气
电化学
物理化学
纳米技术
有机化学
电极
离子
工程类
作者
Hernan G. Sanchez Casalongue,May Ling Ng,Sarp Kaya,Daniel Friebel,Hirohito Ogasawara,Anders Nilsson
标识
DOI:10.1002/anie.201402311
摘要
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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