Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 21: Poster Heterogeneous Catalysis

O 21.7: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Structure and chemical properties of Pt clusters and particles deposited on CeO₂(111) — •Shuang Chen, Zairan Yu, Alexei Nefedov, Christof Wöll, and Yuemin Wang — Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany

CeO₂-supported Pt nanoparticles are of significant technological interest due to their unique catalytic properties and wide range of applications in numerous chemical reactions. However, the catalytic performance of various Pt species remains a highly debated topic. This arises primarily from the complexity of Pt/CeO₂ powder catalysts and the scarcity of accurate reference data obtained from well-defined model systems. Here, we report systematic IR reflection absorption spectroscopic (IRRAS) investigations of Pt deposited on oxidized CeO₂(111) single-crystal surfaces. By employing polarization-resolved IRRAS with CO as a probe molecule and grazing-emission XPS, we were able to track the structural and electronic evolution of Pt on CeO₂(111) as a function of the deposition amount. Various Pt species, ranging from single atoms to small clusters and large particles, were identified. Our results provide solid evidence of strong electronic interactions between Pt and the ceria substrate, offering profound insights into the dynamic behavior of Pt clusters under different conditions. This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project-ID 426888090- SFB 1441.

Keywords: Ceria; IRRAS; Platinum; Single atoms; Metal-support interaction