SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Solid-Liquid Interfaces III: Reactions and Electrochemistry II
O 96.5: Vortrag
Freitag, 31. März 2023, 11:30–11:45, TRE Phy
CO oxidation on Pt layers on Ru(0001): A UHV-STM, DEMS, and SXRD study — •Albert K. Engstfeld1, Lukas Forschner1, Mario Löw2, Zenonas Jusys2, Joachim Bansmann2, R. Jürgen Behm2, and Jakub Drnec3 — 1Ulm University, Institute of Electrochemistry, D-89069 Ulm — 2Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm — 3ESRF, F-38000 Grenoble
According to the Sabatier principle, the performance of an (electro)catalyst material is determined by the fine balance between the binding strength of the reactants, reaction intermediates, and products to the catalyst surface. By changing the structural properties of the substrate, the electronic structure and in turn, also the binding of the species can be modified to tune the performance of the catalyst material. However, also the electrode`s stability plays a crucial role in assessing the catalyst`s performance.
Here we present results on the CO (and MeOH) electrooxidation on Pt layers with different thicknesses deposited on Ru(0001) under UHV conditions. The structural properties are studied by means of STM under UHV conditions before and after the electrochemical measurements. The electrocatalytic properties are studied in a flow cell (in a DEMS configuration) attached to the UHV chamber. This approach allows for disentangling surface redox processes from catalytic processes. Additional SXRD measurements provide additional insights into the stability of the electrodes. In combination, we discuss the fine balance between surface reactivity and electrode stability.