SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster: Solid-Liquid Interfaces
O 69.10: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
In situ surface X-ray diffraction studies of Pt(110) — •Finn Schröter1, Jan Ole Fehrs1, Timo Fuchs1, Jakub Drnec2, Marta Mirolo2, David Harrington3, and Olaf Magnussen1 — 1Christian-Albrechts Universität zu Kiel — 2European Synchrotron Radiation Facility — 3University of Victoria
The surface oxidation of platinum is an important process in the degradation of platinum electrocatalysts in PEM fuel cells, limiting their lifetime. Its atomic-scale mechanism has been addressed in extensive studies by structure-sensitive in situ techniques. However, these studies up to now have been restricted to room temperature, whereas real fuel cells operate at elevated temperatures of 60°C or higher. We here present first temperature-dependent of the surface oxidation of Pt(111) electrodes in perchlorate solution by in situ high-energy surface X-ray diffraction (HESXRD) The measurements were performed at the ID31 beamline of the European Synchrotron Radiation Facility using photon energies of 70 keV. The kinetics of oxidation-induced extraction of Pt atoms out of the surface was quantitatively determined and correlated with the electrochemical charge transfer measured simultaneously in the experiments. The work was funded by the Deutsche Forschungsgemeinschaft via grant 418603497 and the BMBF via project 05K19FK3.