The Reduction of Chlorine on Carbon in AlCl[sub 3]-KCl-NaCl Melts

Using a rotating‐vitreous, carbon disk electrode, the kinetic parameters for chlorine reduction in an AlCl 3 ‐ KCl ‐ NaCl (57.5‐12.5‐30 mole per cent [m/o]) melt were determined. It was found that the reduction of chlorine occurs according to the paths Cl 2 + e − ⇌ Cl − + Cl ads Cl ads + e − ⇌ Cl − with the first step being most probably rate determining. The apparent exchange currents were ( 1 ± 0.15 ) 10 − 4 A / cm 2 at 130 ° C and ( 2.1 ± 0.3 ) 10 − 4 A / cm 2 at 150.6 ° C .