Abstract
Nanostructured surfaces were prepared by electrodeposition of Pd monolayers and monatomic chains onto vicinally stepped Au single-crystal surfaces. The regular arrangement of the steps served to obtain an ordered bimetallic surface with the steps acting as template for the deposition of Pd. Products formed during electrocatalytic hydrogenation of simple unsaturated hydrocarbons and oxidation of CO were detected quantitatively by differential electrochemical mass spectrometry. By variation of both Pd coverage and step density of the substrate surface, the formation of different reaction products was attributed to the respective adsorption sites systematically. Pd step sites were found to strongly influence hydrogenation of simple unsaturated organic adsorbates. Hydrogen adsorption at monatomic Pd chains was not observed. Surprisingly, CO adsorbed on Pd terraces was found to be oxidized at a lower potential than CO on Pd steps.
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