Electrochemical behaviour of dissolved iron chloride in KCl+LiCl+NaCl melt at 550℃

摘要

An electrochemical study of iron was carried out in KCl+LiCl+NaCl melt at 550℃ using a glassy carbon working electrode. Cyclic voltammetry showed that the Fe(Ⅱ)/Fe(0) electron exchange is a soluble/insoluble reversible process. The diffusion coefficient of Fe(II) was calculated using cyclic voltammetry; 1.4×10~(-5) cm~2 s~(-1). For the Fe(Ⅱ)/Fe(Ⅲ) red/ox reaction, analysis of the voltammograms suggests that the process is not reversible and is coupled with a chemical reaction. The stability of FeCl_3 and the effect of equilibrium between FeCl_3 and FeCl_2 are also briefly discussed.