Dynamics of the Interaction Between Ceria and Platinum During Redox Processes

Frontiers in Chemistry
Paola LuchesJan Ingo Flege

Abstract

The work is focused on understanding the dynamics of the processes which occur at the interface between ceria and platinum during redox processes, by investigating an inverse catalytic model system made of ceria epitaxial islands and ultrathin films supported on Pt(111). The evolution of the morphology, structure and electronic properties is analyzed in real-time during reduction and oxidation, using low-energy electron microscopy and spatially resolved low-energy electron diffraction. The reduction is induced using different methods, namely thermal treatments in ultra-high vacuum and in H2 as well as deposition of Ce on the oxide surface, while re-oxidation is obtained by exposure to oxygen at elevated temperature. The use of two different epitaxial systems, continuous films and nanostructures, allows determining the influence of platinum proximity on the stabilization of the specific phases observed. The factors that limit the reversibility of the observed modifications with the different oxidation treatments are also discussed. The obtained results highlight important aspects of the cerium oxide/Pt interaction that are relevant for a complete understanding of the behavior of Pt/CeO2 catalysts.

References

Oct 1, 2013·Physical Chemistry Chemical Physics : PCCP·H WilkensJ Wollschläger
Jun 13, 2014·Angewandte Chemie·Albert BruixKonstantin M Neyman
Feb 14, 2015·Nanoscale·Sergey M KozlovStefan T Bromley
Mar 21, 2013·The Journal of Physical Chemistry Letters·Vitalii StetsovychVladimír Matolín
Dec 15, 2015·Nature Materials·Yaroslava LykhachJörg Libuda
Jul 13, 2018·Physical Chemistry Chemical Physics : PCCP·Andreas SchaeferJohan Gustafson

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Citations

Dec 11, 2019·Physical Chemistry Chemical Physics : PCCP·Christopher J LeeJason F Weaver

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Methods Mentioned

BETA
electron
electron micro-diffraction
quartz microbalance
thermal treatments
electron diffraction
thermal treatment

Software Mentioned

Gxsm

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