title: One-dimensional PtO2 at Pt steps: formation and reaction with CO.
abstract: Using core-level spectroscopy and density functional theory we show that a one-dimensional (1D) oxide structure forms at the steps of the Pt(332) surface after exposure. The 1D oxide is found to be stable in an oxygen pressure range, where bulk oxides are only metastable, and is therefore argued to be a precursor to the Pt oxidation. As an example of the consequences of such a precursor exclusively present at the steps, we investigate the reaction of CO with oxygen covered Pt(332). Albeit more strongly bound, the oxidic oxygen is found to react more easily with CO than oxygen chemisorbed on the Pt terraces.
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.
authors.forename: J G
authors.initials: JG
authors.lastname: Wang
authors.forename: W X
authors.initials: WX
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Borg
authors.forename: J
authors.initials: J
authors.lastname: Gustafson
authors.forename: A
authors.initials: A
authors.lastname: Mikkelsen
authors.forename: T M
authors.initials: TM
authors.lastname: Pedersen
authors.forename: E
authors.initials: E
authors.lastname: Lundgren
authors.forename: J
authors.initials: J
authors.lastname: Weissenrieder
authors.forename: J
authors.initials: J
authors.lastname: Klikovits
authors.forename: M
authors.initials: M
authors.lastname: Schmid
authors.forename: B
authors.initials: B
authors.lastname: Hammer
authors.forename: J N
authors.initials: JN
authors.lastname: Andersen