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Issue 11, 2008
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Co-adsorption of CO onto a Ag-modified Pt(111) — Restructuring of a Ag UPD layer monitored by EC-STM

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Abstract

The effect of co-adsorption of CO on an underpotentially deposited (UPD) silver monolayer on a Pt(111) single crystal electrode in 0.05 M sulfuric acid is investigated for the first time by means of electrochemical scanning tunneling microscopy (EC-STM). Pure electrochemical experiments suggest that the co-adsorption of CO onto Pt single crystal electrodes previously modified by a monolayer of Ag, forces Ag atoms of the first UPD monolayer into a second adlayer. The present EC-STM studies reveal the formation of a large-area Ag network after the co-adsorption of CO. The resulting Ag nanostructures formed on wide Pt(111) terraces are approximately 0.5 nm high and 10 nm wide. The desorption of the newly formed second Ag adlayer, the oxidation of CO and the desorption of Ag atoms from the first adlayer are monitored by EC-STM and simultaneously detected in the corresponding CVs in three different oxidation peaks. EC-STM images recorded afterwards show the unchanged Pt surface. The presence of Ag on the surface leads to a downward shift of the onset of oxygen adsorption on the Pt(111) surface.

Graphical abstract: Co-adsorption of CO onto a Ag-modified Pt(111) — Restructuring of a Ag UPD layer monitored by EC-STM

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Publication details

The article was received on 26 Sep 2007, accepted on 19 Dec 2007 and first published on 17 Jan 2008


Article type: Paper
DOI: 10.1039/B714816J
Phys. Chem. Chem. Phys., 2008,10, 1555-1561

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    Co-adsorption of CO onto a Ag-modified Pt(111) — Restructuring of a Ag UPD layer monitored by EC-STM

    K. F. Domke, X. Xiao and H. Baltruschat, Phys. Chem. Chem. Phys., 2008, 10, 1555
    DOI: 10.1039/B714816J

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