Observing the oxidation state turnover in heterogeneous iridium-based water oxidation catalysts

被引:213
作者
Minguzzi, Alessandro [1 ,3 ]
Lugaresi, Ottavio [1 ,3 ]
Achilli, Elisabetta [2 ]
Locatelli, Cristina [1 ,3 ]
Vertova, Alberto [1 ,3 ]
Ghigna, Paolo [2 ,3 ]
Rondinini, Sandra [1 ,3 ]
机构
[1] Univ Milan, Dipartimento Chim, I-20133 Milan, Italy
[2] Univ Pavia, Dept Chem, I-27100 Pavia, Italy
[3] Ist Nazl Sci & Tecnol Mat, Florence, Italy
关键词
OXYGEN EVOLUTION REACTION; X-RAY-ABSORPTION; OXIDE-FILMS; ELECTRONIC-STRUCTURE; ELECTROLYSIS; ELECTROCATALYSIS; AMPLIFICATION; COMPLEXES; XANES;
D O I
10.1039/c4sc00975d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work the oxidation states assumed by Ir in oxide systems used as heterogeneous catalysts for water oxidation are determined by means of in situ X-ray Absorption Spectroscopy (XAS). Using a highly hydrated iridium oxide film allows the maximum number of Ir sites to be involved in the electrochemical processes occurring at the catalysts during water oxidation (oxygen evolution reaction, OER). X-ray Absorption Near Edge Structure (XANES) spectra clearly indicate the co-existence of Ir(III) and Ir(V) at the electrode potentials where OER occurs. This represents a fundamental step both in the understanding of the water oxidation mechanism catalysed by heterogeneous Ir oxide systems, and in the possible tailoring of electrocatalysts for OER.
引用
收藏
页码:3591 / 3597
页数:7
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