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Operando XAS Study of the Surface Oxidation State on a Monolayer IrOx, on RuOx and Ru Oxide Based Nanoparticles for Oxygen Evolution in Acidic Media
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Number of Authors: 11
2018 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 122, no 2, p. 878-887Article in journal (Refereed) Published
Abstract [en]

Herein we present surface sensitive operando XAS L-edge measurements on IrOx/RuO2 thin films as well as mass-selected RuOx and Ru nanoparticles. We observed shifts of the white line XAS peak toward higher energies with applied electrochemical potential. Apart from the case of the metallic Ru nanoparticles, the observed potential dependencies were purely core-level shifts caused by a change in oxidation state, which indicates no structural changes. These findings can be explained by different binding energies of oxygenated species on the surface of IrOx and RuOx. Simulated XAS spectra show that the average Ir oxidation state change is strongly affected by the coverage of atomic O. The observed shifts in oxidation state suggest that the surface has a high coverage of O at potentials just below the potential where oxygen evolution is exergonic in free energy. This observation is consistent with the notion that the metal-oxygen bond is stronger than ideal.

Place, publisher, year, edition, pages
2018. Vol. 122, no 2, p. 878-887
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Chemical Sciences Physical Sciences
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URN: urn:nbn:se:su:diva-153826DOI: 10.1021/acs.jpcb.7b06982ISI: 000423140600060PubMedID: 28980810OAI: oai:DiVA.org:su-153826DiVA, id: diva2:1189049
Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-03-09Bibliographically approved

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Pedersen, Anders F.Escudero-Escribano, MariaBodin, AndersRossmeisl, JanChorkendorff, IbNilsson, Anders
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