STUDY OF SULFUR ADLAYERS ON POLYORIENTED PLATINUM-ELECTRODES - INFLUENCE ON THE ELECTROCATALYSIS OF THE SO2 OXIDATION REACTION

The catalytic activity of distinct sulphur adlayers on polyoriented Pt has been tested with regard to SO2 oxidation by means of cyclic volta mmetry. A full monolayer of sulphur - on which the adspecies distribut es following a two-site adsorption geometry on average does not exhibi t the most enhancing properties. A highly catalytic layer yields a sul phur oxidation charge within the bilayer level. An excessive depositio n of sulphur leads to loss of the catalytic activity.