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One-dimensional PtO(2) at Pt steps: Formation and reaction with CO
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2005 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 95, no 25, 1-4 p.Article in journal (Refereed) Published
Abstract [en]

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.

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2005. Vol. 95, no 25, 1-4 p.
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URN: urn:nbn:se:kth:diva-49034DOI: 10.1103/PhysRevLett.95.256102ISI: 000234118500042OAI: diva2:461345
QC 20111205Available from: 2011-12-02 Created: 2011-11-24 Last updated: 2011-12-05Bibliographically approved

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Weissenrieder, Jonas
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