SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 78: Heterogeneous Catalysis and Surface Dynamics II
O 78.9: Talk
Thursday, March 30, 2023, 12:30–12:45, TRE Phy
In situ characterization of cerium oxide on Au(111) under reducing and oxidizing conditions by low-energy electron microscopy — •Rudi Tschammer1, Lars Buß1,2, Carlos Morales1, Sanjaya Senanayake3, Jens Falta2,4, and Jan Ingo Flege1 — 1Applied Physics and Semiconductor Spectroscopy, BTU Cottbus-Senftenberg, Cottbus, Germany — 2Institute of Solid State Physics, University of Bremen, Bremen, Germany — 3Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA — 4MAPEX Center for Materials and Processes, University of Bremen, Bremen, Germany
The development of novel catalysts for a variety of applications is a key challenge for modern catalysis. Inverse metal oxide catalysts consisting of oxide nanoparticles dispersed on a metal support have recently attracted much attention, showing higher activity and selectivity compared to traditional catalytic systems, harnessing synergistic effects attributed to the so-called metal-support interaction. To gain further insights, we deposited cerium oxide nanoparticles on Au(111) and studied this system by low-energy electron microscopy (LEEM) and low-energy electron diffraction (LEED). The prepared samples demonstrate a distinct correlation between the deposition temperature and the structural order of the nanoparticles. This has been expanded upon by exploring the changes induced by reduction with H2 and reoxidation with O2 or CO2, again exhibiting a connection between structural order and activity, while also showing the influence of the oxide-metal interaction on the stability of cerium oxide under reducing conditions.