Electrochemical Behaviour of Tin in a LiCl-KCl Eutectic Melt

Yanqing Cai, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Material Science and Engineering, North China University of Science and Technology, Tangshan, China
2018 International Journal of Electrochemical Science  
The electrochemical behaviour and thermodynamic properties of SnCl 2 in a LiCl-KCl eutectic melt was investigated on graphite and Mo electrodes at 500℃ by cyclic voltammetry, chronopotentiometry, square wave voltammetry, and open circuit chronopotentiometry. Two redox couples of tin ions due to Sn(IV)/Sn(II) and Sn(II)/Sn were obtained, and the cathodic peak potentials were found to be 0.50 V and -0.50 V, respectively. The reduction reactions of Sn(IV)/Sn(II) and Sn(II)/Sn are quasi-reversible
more » ... e quasi-reversible processes and occur with two exchanged electrons, respectively. The diffusion coefficients of the Sn(IV) and Sn(II) ions were also determined on graphite electrode by the Berzins-Delahay equation, which were 2.68×10 -5 cm 2 /s and 5.19×10 -5 cm 2 /s, respectively. In addition, square wave voltammetry and open circuit chronopotentiometry experiments performed on a Mo electrode further indicated that the reduction of Sn(II) into Sn metal occurred in a single step and two electrons were exchanged. The research lays a foundation for electrolytic refining and electrodeposition of Zr−Sn alloy.
doi:10.20964/2018.11.21 fatcat:ms63fzmqj5dltirfpw4p3zth34