EFFECT OF INTERFACIAL RESISTANCE ON DETERMINATION OF TRANSPORT-PROPERTIES OF MIXED-CONDUCTING ELECTROLYTES

Combination of impedance spectroscopy and open-cell voltage measuremen ts has been used to determine the transport properties of mixed-conduc ting electrolytes. It is clearly demonstrated experimentally that the ratio of open-cell voltage to the applied Nernst potential can be quit e different from the average ionic transference number; the effect of interfacial polarization resistance on determination of transference n umbers of a mixed-conducting electrolyte must be carefully analyzed, p articularly for a cell based on a thin electrolyte, tested at low temp eratures, or exposed to an atmosphere containing low activities of ele ctroactive species.