Abstract
Cyclic voltammograms were recorded for ruthenium metal in base as a function of sweep limit and hydroxide ion concentration. A variety of both soluble and insoluble corrosion products were observed and an attempt was made to identify the various processes taking place on the basis of known data for this system. The development of a charge storage film under potential cycling conditions, as on iridium and rhodium, was noted. Current flow under potentiostatic conditions below 2.2 V was attributed largely to metal corrosion, the overpotential for oxygen evolution, which was observed only at higher values, being unusually high under these conditions. The vast difference in corrosion behaviour and rates of oxygen evolution between thermally and anodically prepared ruthenium oxide films was attributed to stronger bonding of surface ruthenium ions in the case of the thermally treated lattice. The pronounced effect of stirring on the anodic reactions of the metal in base was attributed to rapid removal of the weakly adherent surface oxide layer.
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