Abstract
The behavior of ultra-thin (<1 ML) films of vanadium oxide on Rh(111) during the H2 + O2 reaction was studied in the 10−6–10−4 mbar range with photoemission electron microscopy (PEEM). One observes that under reaction conditions the V-oxide condenses forming a stripe pattern of macroscopic dimensions on the surface. The pattern is characterized by an intrinsic wave length which obeys a power law dependence on the reactants pressure. The origin of the pattern is discussed within the concept of reactive phase separation, i.e. the strongly attractive interactions between V and O and/or changes in the interfacial energies caused by reduction are presumably the main driving forces for condensation.
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Acknowledgments
F.L. is grateful to the Zentrum für Festkörperchemie und Neue Materialien (ZFM) and the state of Niedersachsen for providing a Georg Christoph Lichtenberg scholarship.
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Lovis, F., Hesse, M. & Imbihl, R. Redistribution of Supported Vanadium Oxide Catalysts by Pattern Formation. Catal Lett 136, 171–176 (2010). https://doi.org/10.1007/s10562-010-0320-5
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DOI: https://doi.org/10.1007/s10562-010-0320-5