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Issue 16, 2016
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Early stages of catalyst aging in the iridium mediated water oxidation reaction

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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

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Publication details

The article was received on 03 Feb 2016, accepted on 16 Mar 2016 and first published on 16 Mar 2016


Article type: Paper
DOI: 10.1039/C6CP00751A
Citation: Phys. Chem. Chem. Phys., 2016,18, 10931-10940
  • Open access: Creative Commons BY-NC license
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    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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