SurfaceScience21 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 30: Mini-Symposium: Electrified solid-liquid interfaces I
O 30.4: Talk
Tuesday, March 2, 2021, 12:00–12:15, R1
Observing the oxidation of platinum under operando electrochemical conditions — •Leon Jacobse1, Ralf Schuster2, Xin Deng1, Silvan Dolling1, Tim Weber3, Herbert Over3, Jörg Libuda2, Vedran Vonk1, and Andreas Stierle1 — 1DESY NanoLab, Deutsches Elektronen-Synchrotron, Hamburg — 2Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen — 3Physikalisch-Chemisches Institut and Zentrum für Materialforschung, Justus Liebig University, Giessen
Platinum electrocatalyst degradation forms a large barrier for the wide-spread application of electrolysers and fuel cells, which are crucial for a sustainable energy society. A detailed understanding of the catalyst surface structure during the chemical reaction is required to design more stable catalysts. We have developed a Rotating Disk Electrode (RDE) setup that enables a structural characterization by synchrotron High-Energy Surface X-Ray Diffraction (HE-SXRD) experiments while maintaining well-defined diffusion conditions and high catalytic reaction rates (current densities). With this setup we followed the oxidation of Pt(111) and Pt(100) model electrodes; starting from the Place-Exchange surface oxidation occurring around 1.1V until the formation of a (bulk) oxide at potentials relevant for the oxygen evolution reaction. In contrast with heterogenous oxidation experiments, no ordered oxide structures are observed.