IMPROVEMENTS IN FLUORINE GENERATION - AMORPHOUS-CARBON ANODES WITH VERTICAL CHANNELS

We describe improvements that have allowed us to operate fluorine cell s with YBD(T) amorphous carbon anodes for over 2000 h and at current d ensities over 200 mA . cm(-2) practically free of polarization. Vertic al channels, 0.2 mm wide and 2 mm deep, facilitate the movement of flu orine up the face of the anode to the electrolyte surface where it esc apes into the vapor space. One anode was operated at 226 mA . cm(-2), it polarized at 100 h, was subjected to a high voltage treatment, and then ran for over 2000 h without polarizing. Another anode ran well at 338 mA . cm(-2). Current efficiency estimates for hydrogen generation and for fluorine generation were near 100%.