LiCl-KCl熔盐体系中Ce（Ⅲ）在液态Ga电极上的电化学行为

采用循环伏安法（CV）、方波伏安法（SWV）和计时电位法（CP）等暂态电化学方法研究了LiCl-KCl熔盐体系中Ce（Ⅲ）在液池Ga和液膜Ga电极上的电化学行为。以高纯Al₂O₃包覆的石墨棒作对电极，以Ag/AgCl(x=2%)为参比电极，结果表明，在液池Ga电极上，Ce（Ⅲ）可一步还原为αGa₆Ce：Ce（Ⅲ）+3e+6Ga=αGa₆Ce，该反应为不可逆过程，并受扩散控制；Ce（Ⅲ）的扩散系数与温度的关系式为：ln D=2.88-10 118.4/T；Ce（Ⅲ）/αGa₆Ce的半波电位与温度的关系式为：E=-1.701+5.472×10^-4T。此外，在Ga液膜电极上，Ce（Ⅲ）可发生欠电位沉积，形成至少三种金属间化合物。

Electrochemical Behavior of Ce（Ⅲ） on Liquid Ga Electrode in LiCl-KCl Eutectic

The electrochemical behavior of Ce（Ⅲ） on the both liquid Ga pool and film Ga electrode is investigated by the various transient methods including of cyclic voltammetry(CV), square wave voltammetry(SWV), and chronopotentiometry(CP). The results show that Ce（Ⅲ） is reduced into αGa₆Ce by one step process on liquid Ga pool cathode: Ce（Ⅲ）+3e+6Ga=αGa6Ce, and the reaction is irreversible and diffusion-controlled. The relationship between the diffusion coefficient of Ce（Ⅲ） and the temperature can be calculated as: ln D=2.88-10 118.4/T. The temperature dependence of the half-wave potential for Ce（Ⅲ）/αGa₆Ce is determined to be: E=-1.701+5.472×10^-4T. On the film Ga electrode, at least three kinds of intermetallic compounds are observed.