In Situ Observation of Surface Species on Iridium Oxide Nanoparticles during the Oxygen Evolution Reaction

被引：440

作者：

Casalongue, Hernan G. Sanchez ^{[1
]}

Ng, May Ling ^{[2
]}

Kaya, Sarp ^{[1
]}

Friebel, Daniel ^{[1
]}

Ogasawara, Hirohito ^{[2
]}

Nilsson, Anders ^{[1
]}

机构：

[1] LBNL, Joint Ctr Artificial Photosynthesis JCAP Energy I, Berkeley, CA 94720 USA

[2] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2014年 / 53卷 / 28期

基金：

日本科学技术振兴机构;

关键词：

electrochemistry; iridium oxide; heterogeneous catalysis; oxygen evolution reaction; X-ray photoelectron spectroscopy; NEAR-AMBIENT CONDITIONS; PHOTOELECTRON-SPECTROSCOPY; OXIDATION-STATE; WATER; FILMS; XPS; ELECTROLYSIS;

D O I：

10.1002/anie.201402311

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页码：7169 / 7172

页数：4

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