Electrochemical Oxidation of Smooth and Nanoscale Rough Pt(111): An In Situ Surface X-ray Scattering Study

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dc.contributor.authorRuge, Martin
dc.contributor.authorDrnec, Jakub
dc.contributor.authorRahn, Björn
dc.contributor.authorReikowski, Finn
dc.contributor.authorHarrington, David A.
dc.contributor.authorCarlà, Francesco
dc.contributor.authorFelici, Roberto
dc.contributor.authorStettner, Jochim
dc.contributor.authorMagnussen, Olaf M.
dc.date.accessioned2019-02-03T22:09:06Z
dc.date.available2019-02-03T22:09:06Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractThe potential dependent surface structure of Pt(111) electrodes in electrochemical environment was studied by in situ crystal truncation rod measurements and in operando grazing incidence small angle X-ray scattering. Determination of the interface structure in the oxidation region reveal a continuous increase of the coverage of place exchanged atoms toward more positive potentials. The resulting oxide consists of an oxygen rich outer and a Pt-rich inner atomic layer. With increasing potential the oxide approaches a more uniform stoichometry. While place exchange on atomically smooth terraces only occurs above 1.05 V, structural changes of 3D Pt islands, grown by repetitive oxidation/reduction cycles, already commence at 0.8 V, which is assigned to oxidation at Pt steps. Evolution of the 3D island distribution occurs in all stages of the cycles: Whereas Pt oxidation leads to narrowing of the lateral size distribution, vertical island growth occurs during the subsequent reduction.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe thank the European Synchrotron Radiation Facility for providing beam time and the ID03 staff for technical assistance. MR, FR, BR, JS, and OMM gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft viaMA1618/13 andMA1618/20. DAH thanks NSERC for financial support.en_US
dc.identifier.citationRuge, M., Drnec, J., Rahn, B., Reikowski, F., Harrington, D.A., Carlà, F., Felici, R., Stettner, J. & Magnussen, O.M. (2017). Electrochemical Oxidation of Smooth and Nanoscale Rough Pt(111): An In Situ Surface X-ray Scattering Study. Journal of The Electrochemical Society, 164(9), H608-H614. http://dx.doi.org/10.1149/2.0741709jesen_US
dc.identifier.urihttp://dx.doi.org/10.1149/2.0741709jes
dc.identifier.urihttp://hdl.handle.net/1828/10579
dc.language.isoenen_US
dc.publisherJournal of The Electrochemical Societyen_US
dc.subjectGISAXSen_US
dc.subjectOxideen_US
dc.subjectPlace exchangeen_US
dc.subjectPt(111) oxidationen_US
dc.subjectSurface X-ray diffractionen_US
dc.titleElectrochemical Oxidation of Smooth and Nanoscale Rough Pt(111): An In Situ Surface X-ray Scattering Studyen_US
dc.typeArticleen_US

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