Faradaic rectification study of cadmium(II)-cadmium in different supporting electrolytes

The Faradaic rectification theory has been extended to the reaction accompanied with multiple electron charge transfer for metal ion—metal solid reactions. The theoretical formulations have been applied for determining the rate constants for each of the two steps ie Cd²⁺ +e Cd⁺ and Cd⁺ +e Cd in the Cd²⁺/Cd(s) reaction. The second step reaction is found to be thousand times slower as compared to the first step reaction and it is in control of the overall rate of reaction. On the basis that the second step of the reaction is overall in control of the reaction, the values of the rate constant determined by applying Delahay's formulations, are found to vary appreciably from those obtained from the present theoretical treatment. The values of rate constant for both the steps in different supporting electrolytes have been obtained and the results have been discussed.