Issue 16, 2016

Early stages of catalyst aging in the iridium mediated water oxidation reaction

Abstract

When exposed to a potential exceeding 1.5 V versus RHE for several minutes the molecular iridium bishydroxide complex bearing a pentamethylcyclopentadienyl and a N-dimethylimidazolin-2-ylidene ligand spontaneously adsorbs onto the surface of glassy carbon and gold electrodes. Simultaneously with the adsorption of the material on the electrode, the evolution of dioxygen is detected and modifications of the catalyst structure are observed. XPS and XAS studies reveal that the species present at the electrode interface is best described as a partly oxidized molecular species rather than the formation of large aggregates of iridium oxide. These findings are in line with the unique kinetic profile of the parent complex in the water oxidation reaction.

Graphical abstract: Early stages of catalyst aging in the iridium mediated water oxidation reaction

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2016
Accepted
16 Mar 2016
First published
16 Mar 2016
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2016,18, 10931-10940

Early stages of catalyst aging in the iridium mediated water oxidation reaction

D. G. H. Hetterscheid, C. J. M. van der Ham, O. Diaz-Morales, M. W. G. M. (. Verhoeven, A. Longo, D. Banerjee, J. W. (. Niemantsverdriet, J. N. H. Reek and M. C. Feiters, Phys. Chem. Chem. Phys., 2016, 18, 10931 DOI: 10.1039/C6CP00751A

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