Electrocatalytic oxidation of ethylene on gold was investigated by means of differential electroc... more Electrocatalytic oxidation of ethylene on gold was investigated by means of differential electrochemical mass spectroscopy (DEMS), quartz crystal microbalance (QCM) and DFT calculations. The product analysis indicates a selectivity of the polycrystalline gold towards formation of acetaldehyde. The oxidation process on fresh surface prepared by surface gold oxide reduction, on the other hand, forms mainly carbon dioxide. The oxidation process
Journal of Electroanalytical Chemistry, Mar 1, 1994
The reduction of peroxodisulfate anions at a polycrystalline gold electrode in various base elect... more The reduction of peroxodisulfate anions at a polycrystalline gold electrode in various base electrolytes (NaF, HClO4, H2SO4) was studied by rotating disc voltammetry and the a.c. impedance technique. The reaction proceeds via two parallel pathways: surface (catalytic) and direct charge transfer mechanisms, which involve chemically adsorbed and solution intermediates respectively. Specific adsorption of peroxodisulfate, and/or of the sulfate anion produced, results in a negative shift of the potential of zero charge Epzc, and in suppression of the electrostatic effect of the electrical double layer on the direct charge transfer at E >Epzc. On the negatively charged electrode surface, the electrostatic repulsion of peroxodisulfate anions from the electrical double layer is a significant kinetic factor which can be accounted for quantitatively using the classical Frumkin correction. In both acidic and neutral media, surface metal oxides play a minor role.
Electrocatalytic oxidation of ethylene on gold was investigated by means of differential electroc... more Electrocatalytic oxidation of ethylene on gold was investigated by means of differential electrochemical mass spectroscopy (DEMS), quartz crystal microbalance (QCM) and DFT calculations. The product analysis indicates a selectivity of the polycrystalline gold towards formation of acetaldehyde. The oxidation process on fresh surface prepared by surface gold oxide reduction, on the other hand, forms mainly carbon dioxide. The oxidation process
Journal of Electroanalytical Chemistry, Mar 1, 1994
The reduction of peroxodisulfate anions at a polycrystalline gold electrode in various base elect... more The reduction of peroxodisulfate anions at a polycrystalline gold electrode in various base electrolytes (NaF, HClO4, H2SO4) was studied by rotating disc voltammetry and the a.c. impedance technique. The reaction proceeds via two parallel pathways: surface (catalytic) and direct charge transfer mechanisms, which involve chemically adsorbed and solution intermediates respectively. Specific adsorption of peroxodisulfate, and/or of the sulfate anion produced, results in a negative shift of the potential of zero charge Epzc, and in suppression of the electrostatic effect of the electrical double layer on the direct charge transfer at E >Epzc. On the negatively charged electrode surface, the electrostatic repulsion of peroxodisulfate anions from the electrical double layer is a significant kinetic factor which can be accounted for quantitatively using the classical Frumkin correction. In both acidic and neutral media, surface metal oxides play a minor role.
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