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Updated: Aug 25, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Pattern Formation in Catalytic H2 Oxidation on Rh: Zooming in by Correlative Microscopy
Johannes Zeininger1, Philipp Winkler1, Maximilian Raab1
1Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.
Abstract:
Spatio-temporal nonuniformities in H2 oxidation on individual Rh(h k l) domains of a polycrystalline Rh foil were studied in the 10-6 mbar pressure range by photoemission electron microscopy (PEEM), X-ray photoemission electron microscopy (XPEEM), and low-energy electron microscopy (LEEM). The latter two were used for in situ correlative microscopy to zoom in with significantly higher lateral resolution, allowing detection of an unusual island-mediated oxygen front propagation during kinetic transitions. The origin of the island-mediated front propagation was rationalized by model calculations based on a hybrid approach of microkinetic modeling and Monte Carlo simulations.
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