Abstract
Nickel ferrite based cermets were examined as possible materials for inert, oxygen evolving anodes in molten salt electrolysis. Four materials with varying contents of NiFe2O4, NiO, Ni and Cu were tested during 10 hours potentiostatic electrolysis in molten CaCl2-based electrolytes at 650{degree sign}C and 850{degree sign}C. It was found that the metal phase corroded during electrolysis. Small amounts of impurity metal were found in the cathode product. The current and potential as function of time showed a stable potential, but quite high current during electrolysis, probably due to corrosion of the metal phase of the anode. Adding excess NiO to the anode increased the performance of the anode, increasing density, stability of the nickel ferrite phase and perhaps increased catalytic activity towards oxygen evolution. Increasing the Ni/Cu ratio in the metal phase decreased the corrosion of the anode, but increased the anode potential.
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