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Phase Separation within Vanadium Oxide Islands under Reaction Conditions: Methanol Oxidation at Vanadium Oxide Films on Rh(111)

  • Submonolayer coverages of V-oxide on Rh(111) condense during catalytic methanol oxidation into a pattern of macroscopic stripes or islands. Under reaction conditions, a phase separation occurs within the VOx islands that has been studied in a pressure range of 10–6–10–4 mbar with photoemission electron microscopy (PEEM), low-energy electron microscopy (LEEM), microspot-low-energy electron diffraction (μLEED), and microspot-X-ray photoelectron spectroscopy (μXPS). An oxidized outer ring with a (√7 × √7)R19.1° structure coexists with an inner (12 × 12) Moiré-type boundary layer and a reduced core exhibiting a (√3 × √3)R30° Moiré type pattern. The dependence of the substructure on the reaction conditions, on V coverage, and on island size was investigated. With μXPS, the V coverages of the different phases in the VOx islands were determined.

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Author: Bernhard von BoehnORCiD, Anton Weißbach, Jon-Olaf KrisponeitORCiD, Jan Ingo FlegeORCiD, Jens FaltaORCiD, Luca Gregoratti, Matteo AmatiORCiD, Patrick Zeller, Ronald ImbihlORCiD
DOI:https://doi.org/10.1021/acs.jpcc.2c04174
ISSN:1932-7455
ISSN:1932-7447
Title of the source (English):The Journal of Physical Chemistry C
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2022
Tag:Low-energy electron microscopy (LEEM),; Methanol Oxidation; Microspot-X-ray photoelectron spectroscopy (μXPS); Microspot-low-energy electron diffraction (μLEED); Photoemission electron microscopy (PEEM); Vanadium Oxide
Volume/Year:126
Issue number:45
First Page:19101
Last Page:19112
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Angewandte Physik und Halbleiterspektroskopie
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