Interfacial Capacity between a Silver Bromide Solid Electrolyte and a Blocking Electrode

The interfacial capacity between a silver bromide single crystal and graphite and platinum blocking electrodes was measured using an AC bridge in the potential range 0.05–0.55 V vs. Ag/AgBr at 200–400 °C. The observed capacity-potential curves were compared with the calculated values from the space charge layer capacity. In the case of the graphite electrode, the capacity had a minimum value at 0.15–0.20 V vs. Ag/AgBr, whereas for the platinum electrode, the capacity was considerably larger and the differential capacity-potential curves were complicated. It is concluded that the space charge layer capacity predominates for the graphite electrode, but for the platinum electrode, its interaction with silver ion must be taken into account.