Abstract
A rotating ring disk electrode rrde assembly for use in molten chloride at 723 K has been constructed. The electrode is made of nickel and high purity alumina. The rotating electrode sealing is made of glass cloth. By the use of this rotating ring disk electrode, cathodic reduction of CdCl 2 in molten LiCl-KCl eutectic melt at 723 K has been investigated in detail. The rotating ring disk system voltammograms have been obtained at rotation velocities of 500–3000 rpm and composition ranging from 0.002 to 0.1 M. As a result of rrde experiments, the existence of monovalent cadmium ion has been confirmed in LiCl-KCl. The standard potential of Cd(II)/Cd(0) is 1.98±0.07 V, and that of Cd(II)/Cd(I) is 2.3±0.1 V vs Li/Li +, respectively. From the dependence of the limiting current on the rotation velocity and concentration a diffusion coefficient of Cd(II) ion has been estimated to be D Cd (II)=2.1 (±0.3) x 10 −5 cm 2s −1 (2.1(±0.3) x 10 −9 m 2s −1).
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