Electrochemical oxidation of smooth and nanoscale rough Pt(111): An in situ surface X-ray scattering study
| Autor: | David A. Harrington, J. Stettner, Roberto Felici, Olaf M. Magnussen, Björn Rahn, Martin Ruge, Finn Reikowski, Francesco Carlà, Jakub Drnec |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Scattering X-ray Oxide Synchrotron radiation Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Grazing-incidence small-angle scattering 0210 nano-technology Nanoscopic scale Beam (structure) |
| Zdroj: | 'Journal of the Electrochemical Society ', vol: 164, pages: H608-H614 (2017) |
| ISSN: | 0013-4651 |
| Popis: | The 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. |
| Databáze: | OpenAIRE |
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