Although the activity coefficients and diffusion coefficients of LaCl₃ in molten LiClKCl salt have been extensively studied, the data on the electrochemical properties of La(III)/La reaction in the melt are very scarce. Among the few measurements, up to five orders of magnitude discrepancies for the reaction rate constant $k^0$ have been reported. In the present study, potentiodynamic polarization measurements at different LaCl₃ concentrations (1–6 wt%) and temperatures (723–823 K) are conducted to obtain accurate values of the exchange current density $i_0$ and charge transfer coefficient $\alpha$. The data are analyzed using non-simplified electrode kinetic equations through the optimization fitting procedures, and conventional Tafel and linear polarization (LP) methods. The concentration dependence of $i_0$ obtained from the optimization fitting method is examined, showing agreement with the theoretical correlation $i_0=nF{k}^0{c}^{(1-\alpha )}$. The corresponding values of $k^0$ are 1.76–3.22 × 10⁻⁵ cm s⁻¹ in 723–823 K.

尽管已经广泛研究了LaCl ₃在熔融LiCl KCl盐中的活度系数和扩散系数，但有关熔体中La（III）/ La反应的电化学性质的数据非常稀少。在少数测量中，反应速率常数的差异最多可达到五个数量级${ķ}^0$已经报道。在本研究中，在不同的LaCl ₃浓度（1–6 wt％）和温度（723–823 K）下进行了电位动力学极化测量，以获取准确的交换电流密度值${\mathrm{一世}}_0$ 和电荷转移系数 $\alpha$。通过优化拟合程序以及常规的Tafel和线性极化（LP）方法，使用非简化的电极动力学方程分析数据。浓度依赖性${\mathrm{一世}}_0$ 检查了从优化拟合方法获得的结果，表明与理论相关性一致 ${\mathrm{一世}}_0=ñF{ķ}^0{C}^{（\mathrm{1个}-\alpha ）}$。的对应值${ķ}^0$在723–823 K中为1.76–3.22×10 ^-5  cm s ^-1。