Study of underpotential deposited Cu layers on Pt(111) and their stability against CO and CO2 in perchloric acid

Literature Information

Publication Date 2013-10-04
DOI 10.1039/C3CP52649F
Impact Factor 3.676
Authors

Christian Schlaup, Sebastian Horch


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Abstract

The underpotential deposition (UPD) of copper on a Pt(111) electrode and the influence of gas coadsorbates, i.e. CO and CO2, on the thus deposited copper layer were studied in a 0.1 M HClO4 electrolyte by means of EC-STM. By UPD, an atomically flat Cu layer is formed, which exhibits a pseudomorphic (1 × 1) structure. However, it contains several point defects due to which its total coverage is less than a monolayer, in agreement with the measured charge density in the CV curves. Upon exposure to a CO-saturated solution the pseudomorphic structure collapses to a coalescent structure with many vacancy islands. This phase transition is induced by the preferential binding of CO to the Pt(111) surface. In contrast, CO2, which binds stronger to copper, does not affect the pseudomorphic structure of the Cu layer.

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Front cover

Cover

DOI: 10.1039/C6CP90001A

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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