One-dimensional PtO(2) at Pt steps: Formation and reaction with CO

Using core-level spectroscopy and density functional theory we show that a one-dimensional (1D) PtO(2) oxide structure forms at the steps of the Pt(332) surface after O(2) exposure. The 1D oxide is found to be stable in an oxygen pressure range, where bulk oxides are only metastable, and is therefor...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2005, Vol.95 (25), p.1
Main Authors: Wang, J. G., Li, W. X., Borg, M., Gustafson, J., Mikkelsen, A., Pedersen, T. M., Lundgren, E., Weissenrieder, Jonas, Klikovits, J., Schmid, M., Hammer, B., Andersen, J. N.
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using core-level spectroscopy and density functional theory we show that a one-dimensional (1D) PtO(2) oxide structure forms at the steps of the Pt(332) surface after O(2) 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.256102