Abstract
We have studied the oxidation of CO adsorbed as a monolayer on a platinum polycrystalline disk and on a platinum monocrystalline bead in HClO 4 and H 2SO 4 pure or containing Cl − media. The effects of specific anion adsorption on the potential and profile of the CO oxidation peak are demonstrated: first, a positive shift of this potential and second, a splitting of the oxidation peak due to the competitive adsorption of anions on terrace and step sites of the surface of the bead. It is concluded that in these media CO adsorbed species are immobile on the surface and their oxidation is structure-sensitive.
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