15-18 March 2021
DESY
Europe/Berlin timezone

Observing the oxidation of platinum under operando electrochemical conditions

18 Mar 2021, 11:15
20m
https://desy.zoom.us/j/97195167153

https://desy.zoom.us/j/97195167153

Oral contribution In situ / in operando studies In situ / in operando studies

Speaker

Dr Leon Jacobse (FS-NL (Nanolab))

Description

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, 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.

Primary author

Dr Leon Jacobse (FS-NL (Nanolab))

Co-authors

Ralf Schuster (Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg,) Xin Deng (DESY NanoLab, Deutsches Elektronen-Synchrotron, Hamburg) Silvian Dolling (DESY NanoLab, Deutsches Elektronen-Synchrotron, Hamburg) Tim Weber (Physikalisch-Chemisches Institut and Zentrum für Materialforschung, Justus Liebig University, Giessen) Herbert Over (Physikalisch-Chemisches Institut and Zentrum für Materialforschung, Justus Liebig University, Giessen) Jörg Libuda (Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen) Dr Vedran Vonk (Deutsches Elektronen-Synchrotron (DESY), FS-NL (Nanolab), Deutschland) Andreas Stierle (FS-NL (Nanolab))

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