ABSTRACT
I. INTRODUCTION Elementary fluorine is usually produced by electrolysis of molten KF * 2HF in “ medium-temperature cells” at 80 to 120°C. Nongraphitized carbon is the usual material that can be used for the anodes. However, a high anodic overvoltage is observed (« 3 V in industrial cells), which results in low energy efficiency of the process. This situation is related to the formation of a passivating film of graphite fluoride at the surface of the electrodes.
