Etude voltamperometrique du chlorure de cadmium dans l'eutectique LiClKCl fondu

Abstract

Potentiometric study of the Cd(II)/Cd equilibrium, in the fused LiClKCl eutectic mixture at 450°C gave evidence of cadmium(II) chloride complexes. The apparent standard potential E ′0 x(Cd/Cd(II)) was −1.525 V/ E nc. The cadmium chloride reduction kinetics was studied on a tungsten electrode. The voltammograms were analysed using a convolution procedure that demonstrated the Cd(II)/Cd exchange reversibility. The Cd(II) ion diffusion and activity coefficients in dilute media were computed: ▪ The cadmium chloride reduction occurred reversibly according to: ▪. When the temperature was varied between 400 and 550°C, γCd(II) decreased from 3.3 × 10 −2 to 2.18 × 10 −2 and D Cd(II) obeyed the Arrhénius relation D = 1.24 × 10 −3 exp(−2989/ T) cm 2 s −1.