Abstract
The anodic behavior of Ag electrode, which is strongly associated with high power alkaline batteries, was investigated mainly by the FFT impedance method. Silver dissolution and some complicated oxide formation stages were interpreted by postulating plausible equivalent circuits. The impedance results showed that the silver dissolution reaction could be represented as the Randles circuit, indicating that the reaction was controlled by the diffusion of Ag (I) to the bulk solution. The Cole-Cole plots of the measured impedance distinctly revealed the differences between the formation reactions for Ag2O and AgO: the Ag2O reaction showed the resistance and capacitance components typical of dielectric materials, while that for AgO included factors characteristic of conductors.
