MODIFICATION OF THE PLATINUM-ELECTRODE OXIDIZED SURFACE WITH VARIOUS ADDITIVES - A QUANTUM-CHEMICAL STUDY

The modification of the oxidized surface of platinum electrodes by var ious admixtures is studied in the carbonate-berate electrolyte using q uantum chemical modeling. Sulfur is shown to interact with platinum vi a a bridging oxygen atom forming no covalent bond with the metal. When thiocyanate ions are used as the modifying additive, the amount of ni trogen accumulated in the electrode surface layers is higher than that observed when ammonium ions are added in the electrolyte. The rationa le for this phenomenon is given.