Oxidation of Pt(111) under Near-Ambient Conditions
2011 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 107, no 19, 195502- p.Article in journal (Refereed) Published
The oxidation of Pt(111) at near-ambient O(2) pressures has been followed in situ using x-ray photoelectron spectroscopy (XPS) and ex situ using x-ray absorption spectroscopy (XAS). Polarization-dependent XAS signatures at the O K edge reveal significant temperature-and pressure-dependent changes of the Pt-O interaction. Oxide growth commences via a PtO-like surface oxide that coexists with chemisorbed oxygen, while an ultrathin alpha-PtO(2) trilayer is identified as the precursor to bulk oxidation. These results have important implications for understanding the chemical state of Pt in catalysis.
Place, publisher, year, edition, pages
2011. Vol. 107, no 19, 195502- p.
IdentifiersURN: urn:nbn:se:su:diva-70675DOI: 10.1103/PhysRevLett.107.195502ISI: 000297006700011OAI: oai:DiVA.org:su-70675DiVA: diva2:482279
authorCount :102012-01-232012-01-232014-04-01Bibliographically approved