@misc{BoehnWeissbachKrisponeitetal., author = {Boehn, Bernhard von and Weißbach, Anton and Krisponeit, Jon-Olaf and Flege, Jan Ingo and Falta, Jens and Gregoratti, Luca and Amati, Matteo and Zeller, Patrick and Imbihl, Ronald}, title = {Phase Separation within Vanadium Oxide Islands under Reaction Conditions: Methanol Oxidation at Vanadium Oxide Films on Rh(111)}, series = {The Journal of Physical Chemistry C}, volume = {126}, journal = {The Journal of Physical Chemistry C}, number = {45}, issn = {1932-7455}, doi = {10.1021/acs.jpcc.2c04174}, pages = {19101 -- 19112}, abstract = {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) Moir{\´e}-type boundary layer and a reduced core exhibiting a (√3 × √3)R30° Moir{\´e} 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.}, language = {en} }