Carbon Electrode for Electrochemical Studies in Cryolite-Alumina Melts at 700-960°C

摘要

The paper presents the results of tests of different carbon electrode designs for electrochemical studies in cryolite-alumina melts in the temperature range of 700-960°C. Operation of the electrode and its applicability as the reference electrode is analyzed. The theoretical value of the maximum possible instability of its potential related to instability of the gas composition is calculated. A new design of the carbon electrode is suggested in which the gas composition is much more stable. It is shown that the suggested electrode is suitable for application as the reference electrode in cryolite-alumina melts in the temperature range of 750°C and above. The electrode can be used for a prolonged time. Herewith, its potential remains stable and reproducible.