A rotating-ring disk electrode assembly, made of Ni and high-purity alumina, was constructed for use in molten chlorides at 723K. By using this electrode, the cathodic reduction of CdCl2 in a LiCl-KCl eutectic melt was investigated at 723K. Rotating ring disk voltammograms were obtained for rotation velocities of 500 to 3000rpm, and for compositions which ranged from 0.002 to 0.1M. As a result, the existence of monovalent Cd ions in LiCl-KCl was confirmed. The standard potential of CdII/Cd0 was 1.98V, and that of CdII/CdI was 2.3V, respectively, versus Li/Li+. From the dependence of the limiting current upon rotation velocity and concentration, the diffusivity of the CdII ion was deduced to be equal to 2.1 x 10-5cm2/s.

Rotating Ring Disk Electrode in Molten Chloride. H.Yabe, K.Ema, Y.Ito: Electrochimica Acta, 1989, 34[10], 1479-83

Table 98

Diffusivity of Cu+ in LiCl-42mol%KCl Melts at 450C