THE STRUCTURE OF THE ELECTRIC DOUBLE-LAYER ON LIQUID-METAL ELECTRODESIN INDIVIDUAL ALKALI-METAL HALIDE MELTS

The manner in which the capacitance of the electric double layer on li quid bismuth in molten alkali-metal halides varies with the potential, temperature, and ionic composition of the electrolyte was investigate d. It was found that capacitance plotted against potential yields para bolic curves with a minimum. The position of the curves and the slope of their branches depend on the temperature, cationic and anionic comp osition of the salt phase. The capacitance at the minima of the curves decreases with an increase in cation size and in the ionic potential of the anions in the melt. The minimal capacitance varies nonmonotonic ally with temperature. The observed facts are explained assuming an au tocomplex structure for the salt side of the electric double layer.