The electronic structure of iridium oxide electrodes active in water splitting

Pfeifer, V, Jones, TE, Velasco Vélez, JJ, Massué, C, Greiner, MT, Arrigo, R ORCID:, Teschner, D, Girgsdies, F, Scherzer, M, Allan, J, Hashagen, M, Weinberg, G, Piccinin, S, Hävecker, M, Knop-Gericke, A and Schlögl, R 2015, 'The electronic structure of iridium oxide electrodes active in water splitting' , Physical Chemistry Chemical Physics, 2016 (18) , pp. 2292-2296.

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Iridium oxide based electrodes are among the most promising candidates for electrocatalyzing the oxygen evolution reaction, making it imperative to understand their chemical/electronic structure. However, the complexity of iridium oxide's electronic structure makes it particularly difficult to experimentally determine the chemical state of the active surface species. To achieve an accurate understanding of the electronic structure of iridium oxide surfaces, we have combined synchrotron-based X-ray photoemission and absorption spectroscopies with ab initio calculations. Our investigation reveals a pre-edge feature in the O K-edge of highly catalytically active X-ray amorphous iridium oxides that we have identified as O 2p hole states forming in conjunction with IrIII. These electronic defects in the near-surface region of the anionic and cationic framework are likely critical for the enhanced activity of amorphous iridium oxides relative to their crystalline counterparts.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Biomedical Research Centre
Journal or Publication Title: Physical Chemistry Chemical Physics
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Related URLs:
Depositing User: Dr R Arrigo
Date Deposited: 04 Dec 2018 11:28
Last Modified: 16 Feb 2022 18:54

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