ABSTRACT
Although it would be attractive to use metallic anodes in the electrowinning of fluorine, it seems that only nickel or platinum can be used for this purpose. The electrochemical behavior of nickel in KF • 2HF has been investigated from a fundamental point of view using cyclic voltammetry and impedance spectros copy [62]. The authors have proposed a mechanism involving the formation of nickel fluoride and adsorbed species. In fact, nickel anodes are used only in special cells devoted to the preelectrolysis of new electrolytes, or in the electro chemical preparation of CF4-free NF3 from the electrolysis of low temperature NH4F • nHF melts.
