Electrochemical Behavior of Tin in Molten LiCl-KCl at 450 ℃

Abstract

The electrochemical behavior of tin was studied with cyclic voltammetry at glassy carbon electrodes in the fused LiCl-KCl at 450 ℃. Metallic tin deposition on the glassy carbon electrode occurs at a potential of around -0.56 V with Ag/AgCl reference electrode. the diffusion coefficient DSn 2+ is determined to be 3.0×10-5 cm2 s -1 . At higher anodic voltage, Sn2+ is oxidised to Sn4+. The average number of electrons was determined to be 2 by using the difference between the peak and half peak potentials. Metallic tin was prepared in potentiostatic mode at -0.7 V versus Ag+ /Ag reference for 4 hours. Mass transport towards the electrode is a simple diffusion process and the diffusion coefficient was calculated. The current efficiency for deposition of Sn was as high as 95%.