Co chemisorption on PtCu surfaces II. (1 × 1)-CO/Pt0.98Cu0.02(110) |
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Authors: | ML Shek PM Stefan I Lindau WE Spicer |
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Institution: | Stanford Electronics Laboratories, Stanford University, Stanford, California 94305, USA |
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Abstract: | The chemisorption of CO on the Pt atoms of an initially (1 × 3) reconstructed Pt0.98Cu0.02(110) surface at ~ 373 K can lead to the formation of a (1 × 1) surface. Comparisons are made with (1 × 3)-CO surfaces formed by CO exposures at 293 or 155 K. Thermal desorption shows that the (1 × 1)-CO surface has an enhanced population of high temperature CO peak ( ~ 543 K) from Pt sites. The CO-induced structural conversion also leads to a decrease in the subsequent CO uptake on the low temperature Pt sites and on the Pt-Cu “mixed” sites, with a concomitant increase in adsorption on the Cu-like sites. Such a reduction in the number of the Pt-Cu “ mixed” sites is also reflected in the CO-induced changes of the Cu 3d-derived states and the core levels. A dynamic interplay between chemisorption and surface structure is thus demonstrated. |
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