Electrocatalytic oxidation of CO on Ru(0001) surfaces: The influence of surface disorder
Literature Information
J. Lee, W. B. Wang, M. S. Zei, G. Ertl
Smooth and rough (created by argon ion sputtering) Ru(0001) surfaces were structurally characterized by reflection high energy electron diffraction (RHEED), and their activity in electrooxidation of CO in 0.1 M HClO4 solution was probed by cyclic voltammetry (CV). While the peak potentials of CO-oxidation on the smooth surface varied with the CO,OH-adsorbate composition (which changed in subsequent scans), these were markedly (∼0.3 V) lower with the rough surface. This difference is attributed to the varying properties of the Ru–O bond whose activation is considered to be rate-limiting. The enhanced activity of the rough surface is also reflected by the fact that the entire amount of adsorbed CO becomes completely oxidized during the first anodic scan, while with the flat surface at least three cycles are required.
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