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.
Author: | Bernhard von BoehnORCiD, Anton Weißbach, Jon-Olaf KrisponeitORCiD, Jan Ingo FlegeORCiD, Jens FaltaORCiD, Luca Gregoratti, Matteo AmatiORCiD, Patrick Zeller, Ronald ImbihlORCiD |
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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 |