Abstract
Seven different foreign metal ad-atoms (Bi, Cd, Cu, Pb, Re, Ru, Tl) were investigated as activity modifiers of a platinum electrode for the electrocatalytic oxidation of ethylene-glycol in alkaline medium. None of these metal ad-atoms has an inhibiting behaviour at the optimum concentration of the precursor salt in solution. Among them, Pb, Bi and Tl greatly enhance the electrocatalytic activity of platinum, leading to current densities as high as 100 mA cm −2 for 0.1 M ethylene-glycol at room temperature; Cd shifts the whole polarization curve towards negative potentials; and Cu, Ru and Re leave the electrocatalytic activity of platinum practically unaffected. A qualitative explanation is suggested, based on the modification (due to the presence of the metal ad-atom) of the coverage of the electrode surface both by the organic adsorption residue and adsorbed hydroxyl.
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