Abstract
Anodic oxidation of Ag-Cu and Ag-Pd alloys in concentrated sulfuric acid solutions is studied by cyclic voltammetry. Influence of electronegative (Cu) and electropositive (Pd) constituents on the rate and mechanism of the silver electrooxidation in non-steady-state conditions is revealed. The maximum silver oxi- dation current increases with the copper content due to a decreased H 2 SO 4 concentration in the near-electrode layer and increased solubility of passivating phase Ag 2 SO 4 . The mechanism of ionization of palladium-doped silver is complicated by two electrochemical reactions involving the formation of Ag 2 SO 4 and .
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