Double Layer Studies using Depolarizers as Probe - A Reassessment

The influence of the double layer on mercury electrodes has been assessed by examining a large number of depolarizers and supporting cations. Cross-analysis of the results shows that, besides the Frumkin mechanism, ion-pairing can be also a significant factor, either by increasing the local concentration of the depolarizer, or by enhancing its intrinsic electroactivity. These effects are correlated to various other types of behavior (electrolytes, colloids, exchangers) in terms of a common charge interaction model taking into account structural changes brought to the solvent