Electrode Capacitance in Silver-Halide Solid Electrolyte Cells

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Abstract
Potentiostatic chronocoulometry on polarized graphite electrodes on and solid electrolytes at room temperature shows an ideally fast, almost voltage‐independent, double layer charging process for both electrolytes. Results on the more highly conductive electrolyte are similar to , but with moderate capacitance dispersion in the subsecond time range. For all three electrolytes, the results suggest charging by a compact, purely electrostatic, interfacial Ag+‐ion layer separated from the graphite surface by a strongly adsorbed anion layer. For platinum electrodes on and , a variety of types of platinum and surface pretreatments gave the common result of a slow, broadly dispersed charging process. The Pt results are consistent with a previously proposed interface model in which charging involves both cation and anion motion, and suggests that slow charging results from the relatively immobile anions. The relationship between various types of double layer capacitance in solid electrolytes is discussed.

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