The capacity of a mercury electrode in electrolytic solution

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Abstract
Measurements of the capacity between a mercury electrode and an aqueous electrolytic solution show two features which have not previously been explained. On cathodic polarization, the capacity is extremely insensitive to the size of the cations; and it is found that the fraction of the potential drop through which an adsorbed anion moves is remarkably small. Both features can be explained by supposing that the dielectric constant of the water rises very rapidly with distance from the metal surface, and this is consistent with a model of the structure of the interface which explains the general behaviour of the capacity as a function of polarization.

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