On the potential dependence of the preceding chemical step in the Cd(II) reduction from aqueous KF solutions: a DMμE study

It is shown that the reduction of Cd(II) can be studied using the dropping mercury microelectrode (DMμE) so that the preceding chemical step is kinetically fully rate-determining. Consequently its rate constant can be obtained with good accuracy, which allows us to show that its weak potential dependence can be explained quantitatively using simple double-layer theory. The DMμE voltammogram is shown to vary with base electrolyte concentration in accordance with these ideas.