Determination of the Exchange Currents
at the Silver MicrocrystalNitrate Melt Interface

N. A. Saltykova, O. L. Semerikova, N. O. Esina, A. N. Baraboshkin^†, and A. A. Pankratov

Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 20, Yekaterinburg, 620219 Russia

Received August 1, 1995

Abstract—The exchange currents for the silver deposition–dissolution reaction are determined in an individual
AgNO₃ melt and dilute AgNO₃NaNO₃KNO₃ solutions at 250–300°C. The exchange current was calculated
using the experimental time dependences of overvoltage and the data on the number of crystals formed at the
cathode. At a given current density of the polarizing current, the exchange current is found to depend on the
cathode material (platinum or iridium) and the state of the cathode surface, which is governed by the conditions
of a preliminary anodic treatment. The exchange current is observed to increase considerably with the increas-
ing current density, which may be attributed to the dependence of the structure and size of growing crystals on
the current density.

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