The anodic dissolution of silver into silver rubidium iodide — Impedance measurements

Abstract

A.c. impedance measurements have been made on the Ag/Ag 4RbI 5 interphase at anodic potentials less than 50 mV vs. Ag/Ag +, using an automatic frequency response analyser. At overpotentials between 10 and 35 mV a high frequency semicircle and a low frequency inductive shape were seen. Spectra at these low overpotentials can be interpreted in terms of rate determining two-dimensional nucleation and growth of holes in the metal surface. The number of atoms in the critical nucleus at various overpotentials have been calculated from both steady state and impedance measurements.