PECULIARITIES OF THE ELECTRICAL DOUBLE-LAYER STRUCTURE ON RENEWED ELECTRODES OF EUTECTIC ALLOYS

Differential capacitance curves are measured on renewable electrodes o f Sn-Pb and Sn-Cd eutectic alloys in the region of their ideal polariz ability. It is shown that, upon the renewal of the electrode surface, the transients of the double layer capacitance are observed which indi cate anomalously high surface-phase changes on electrodes. A model of the temporal effects observed is proposed and substantiated. According to this model, the surface enrichment with the surface-active alloy c omponent proceeds via the mechanism of surface diffusion of this compo nent from the areas enriched with it (boundaries of Sn crystal grains) . (C) 1997 Published by Elsevier Science Ltd.