SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.2: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, CHE 91
Formation of the Pd/Co3O4 interface — •Yaroslava Lykhach1, Maximilian Kastenmeier1, Lukáš Fusek1,2, Matteo Farnesi Camellone3, Tomáš Skála2, Nataliya Tsud2, Viktor Johánek2, Sascha Mehl4, Josef Mysliveček2, Simone Piccinin3, Olaf Brummel1, Stefano Fabris3, and Jörg Libuda1 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2Charles University, Prague, Czech Republic — 3Istituto Officina dei Materiali, CNR-IOM, Trieste, Italy — 4Elettra-Sincrotrone Trieste SCpA, Basovizza-Trieste, Italy
Metal-oxide interfaces play a major role in the design of advanced functional materials for applications in catalysis, energy storage, and nanoelectronics. We investigated the formation of the metal/oxide interface during deposition of Pd nanoparticles onto a well-ordered Co3O4(111) substrate by means of synchrotron radiation photoelectron spectroscopy (SRPES), density functional theory (DFT), and scanning tunnelling microscopy (STM). DFT predicted strong interaction between Pd and Co3O4(111) which resulted in the growth of two-dimensional Pd islands densely covering the substrate. We observed a charge transfer across the metal/oxide interface resulting in partial oxidation of Pd deposits and partial reduction of Co3O4(111). Based on the analysis of the degree of the reduction of Co3O4(111), we found that the charge transfer at the Pd/Co3O4(111) is confined to the near-surface region of Co3O4(111).