In Situ Observation of Surface Species on Iridium Oxide Nanoparticles during the Oxygen Evolution Reaction
In Situ Observation of Surface Species on Iridium Oxide Nanoparticles during the Oxygen Evolution Reaction
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DOI：
10.1002/anie.201402311
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发表时间：
2014-07-01
影响因子：
16.6
通讯作者：
Nilsson, Anders
中科院分区：
文献类型：
--
作者：
Casalongue, Hernan G. Sanchez;Ng, May Ling;Nilsson, Anders
采用常压X射线光电子能谱原位研究了纳米氧化铱电催化剂在析氧反应条件下的电化学行为。在OER条件下，铱经历从Ir-IV到Ir-V的氧化态变化，其主要发生在催化剂的表面。铱的化学变化与表面氢氧化物的减少相结合，提供了实验证据，强烈表明氧化铱上的析氧反应是通过OH介导的去质子化机制发生的。
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.