Electrical double layers in fused alkali metal nitrates

Abstract

Interfacial capacities have been determined at mercury electrodes in several molten alkali nitrate eutectics. A dropping mercury electrode was used to trigger and thereby synchronize a precision impedance bridge. Electrode impedances for systems containing electro-active species (chloride and bromide ions) were analyzed and the double-layer capacities were all found to be shallow parabolic functions of potential. Bromide and chloride ions contributed an additional capacitance at their reversible potentials which was attributed to a charge-transfer (faradaic) capacitance of the type described by Delahay.