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O: Fachverband Oberflächenphysik

O 61: Heterogeneous Catalysis

O 61.7: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG2

CO-Adsorption on Pt/h-BN nanocluster arrays — Fabian Düll, Florian Späth, Johann Steinhauer, Philipp Bachmann, Udo Bauer, Hans-Peter Steinrück, and •Christian Papp — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen

Nanocluster arrays supported on two-dimensional templates are intriguing systems for the investigation of catalytic processes. We report on the reactivity of Pt nanoparticles deposited on h-BN/Rh(111). In our model study we employ high-resolution XPS to investigate the interaction of such nanoclusters with CO. Three CO-induced species are observed in the C 1s core level spectra. These are assigned to CO adsorbed in on-top and bridge terrace sites and step sites in comparison with single crystal data. The step sites are occupied first during adsorption and show the highest desorption temperature, indicating that these are the most stable adsorption sites for CO. Also a temperature induced site change of CO from terrace to step sites is observed. The first adsorption/desorption cycle differs from later cycles, due to sintering. This behavior is explained by a change of the shape of the nanoparticles during the first adsorption/desorption cycle. Furthermore, we will discuss similarities and differences to platinum nanoclusters supported on graphene.