TY - GEN A1 - Boehn, Bernhard von A1 - Weißbach, Anton A1 - Krisponeit, Jon-Olaf A1 - Flege, Jan Ingo A1 - Falta, Jens A1 - Gregoratti, Luca A1 - Amati, Matteo A1 - Zeller, Patrick A1 - Imbihl, Ronald T1 - Phase Separation within Vanadium Oxide Islands under Reaction Conditions: Methanol Oxidation at Vanadium Oxide Films on Rh(111) T2 - The Journal of Physical Chemistry C N2 - 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. KW - Methanol Oxidation KW - Vanadium Oxide KW - Photoemission electron microscopy (PEEM) KW - Low-energy electron microscopy (LEEM), KW - Microspot-low-energy electron diffraction (μLEED) KW - Microspot-X-ray photoelectron spectroscopy (μXPS) Y1 - 2022 U6 - https://doi.org/10.1021/acs.jpcc.2c04174 SN - 1932-7455 SN - 1932-7447 VL - 126 IS - 45 SP - 19101 EP - 19112 ER -