The role of silver as an alloying additive to reduce the overpotential of the oxygen evolution reaction on lead anodes used in the electrowinning of zinc has not previously been established. This paper summarizes the results of a detailed study of the mechanism of the action of silver; both as an additive to the alloy and in solution. The presence of Ag2O2 in the oxide layer was confirmed on Pb electrodes anodised in sulphuric acid electrolytes containing silver ions. The enhanced electrochemical activity of PbAg alloy anodes over Pb is attributed to the presence of Ag2O 2 in the corrosion layer.
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