ESTIMATION OF SINGLE ELECTRODE HEATS

An approximate expression for single electrode heats have been derived and tested. Peltier coefficients of a metal electrode in contact with a molten salt mixture were first derived using irreversible thermodyn amics of surfaces. The expression for the Peltier coefficient for the electrolyte side of the interface has the value of a one-component ele ctrolyte as a basis and includes correction terms for multicomponent m ixtures. Analyses of results reported in the literature for salt mixtu res of AgX-BX and CuX-BX show how the correction terms vary when the e lectrode surface is chosen as the frame of reference for the transport s. Here X represents a halide ion and B is an alkali metal. The expres sion is used to estimate electrode heats for the B/BX electrode within 10-20% accuracy. The error is mainly due to neglect of the transporte d heat in the electrolyte. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.