Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 13: Solid-liquid interfaces: Reactions and electrochemistry I
O 13.12: Talk
Monday, March 9, 2026, 17:45–18:00, TRE/PHYS
Size Dependent Stability of Pt-supported Ceria Nanoparticles in Alkaline Electrolyte — Lukáš Fusek1, Pankaj Kumar Samal1, Jiří Keresteš1, Ivan Khalakhan1, Viktor Johánek1, Yaroslava Lykhach2, Jörg Libuda2, Olaf Brummel2, and •Josef Mysliveček1 — 1Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Praha 8, Czech Republic — 2Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany
Ceria nanoparticles find applications in electrocatalysis as co-catalysts for alcohol and CO oxidation, and for fuel cell and water electrolysis reactions. Synergistic effects of ceria are expected to critically depend on the cerium phases established under electrochemical conditions.
We perform a combined surface science and electrochemical study of CeO2(111) nanoparticles on Pt(111). Under electrochemical operation conditions, large ceria nanoparticles exhibit a stable redox behavior, while nanoparticles smaller than 5 nm destabilize and convert to a fully hydrated phase. Both types of nanoparticles block OH adsorption and H evolution on Pt(111), but do not block H adsorption, indicating H intercalation.
Our results reveal the nature of the electrocatalytically active cerium phases [10.1039/d3cp03831a] and underline the relevance of combined surface science and electrochemical experiments [10.1021/acs.jpclett.5c01465] for obtaining in-operando information on model electrocatalyst systems.
Keywords: inverse model catalyst; cerium oxyhydroxide; scanning tunneling microscopy; x-ray photoelectron spectroscopy; cyclic voltammetry