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研究了温度范围在723-908K的LiCl-KCl熔盐体系中MgCl2的电化学行为和热力学性质.循环伏安和方波伏安法研究表明镁离子的电化学还原过程为包含了两个电子转移的一步反应.利用Berzins和Delahay方程计算了不同温度下的镁离子的扩散系数,并通过Arrhenius公式计算了镁离子在LiCl-KCl熔盐体系中的扩散活化能.采用开路计时电位法得到了不同温度下的Mg(II)/Mg(0)体系的平衡电位,并结合电动势法计算了在LiCl-KCl熔盐体系中Mg(II)/Mg(0)体系的标准形式电位.根据不同温度下的标准形式电位,计算得到了MgCl2在LiCl-KCl熔盐体系中的熵变和焓变以及不同温度下的活度系数.
The electrochemical behavior and thermodynamic properties of MgCl2 in the LiCl-KCl molten salt system at 723-908 K were studied.The cyclic voltammetry and the square wave voltammetry study showed that the electrochemical reduction of magnesium ion was composed of two electron transfer The diffusion coefficients of magnesium ions at different temperatures were calculated by the Berzins and Delahay equations and the activation energy of diffusion of magnesium ions in the LiCl-KCl molten salt system was calculated by Arrhenius formula.The open circuit chronopotentiometry The equilibrium potentials of Mg (II) / Mg (0) system at different temperatures and the electromotive force method were used to calculate the standard form potentials of Mg (II) / Mg (0) system in LiCl-KCl molten salt system. , The entropy and enthalpy change of MgCl2 in LiCl-KCl molten salt system and the activity coefficient at different temperatures were calculated.