ELECTROLYTIC GENERATION OF FLUORINE WITH KF-2HF MELTS CONTAINING ALF3 OR LIF

Cyclic voltammetry experiments have been performed in order to point out the effect of the addition of LiF or AlF3 into KF-2HF melts on the behaviour of the anodic carbon material during the preparation of elemental fluorine. These additions are effective to reduce the passivation of the anode, only if colloidal suspension of the metallic fluoride are used. This effect is attributed to the formation, at the interface, of a conducting ternary compound similar to those which have been chemically synthesized by other authors. This compound is thought to enhance electron transfer at the interface and to improve the wettability of the electrode by the melt. © 1990.