title: Oxidation of Pt(111) under near-ambient conditions.
abstract: The oxidation of Pt(111) at near-ambient O2 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 α-PtO2 trilayer is identified as the precursor to bulk oxidation. These results have important implications for understanding the chemical state of Pt in catalysis.
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Miller
authors.forename: H
authors.initials: H
authors.lastname: Öberg
authors.forename: S
authors.initials: S
authors.lastname: Kaya
authors.forename: H
authors.initials: H
authors.lastname: Sanchez Casalongue
authors.forename: D
authors.initials: D
authors.lastname: Friebel
authors.forename: T
authors.initials: T
authors.lastname: Anniyev
authors.forename: H
authors.initials: H
authors.lastname: Ogasawara
authors.forename: H
authors.initials: H
authors.lastname: Bluhm
authors.forename: L G M
authors.initials: LG
authors.lastname: Pettersson
authors.forename: A
authors.initials: A
authors.lastname: Nilsson