This work concerned the electrochemical behaviors of Ni(II) in LiCl-KCl melt at the temperature of 673 K. The methods of Cyclic voltammetry (CV), square wave voltammetry (SWV) and open circuit chronopotentiometry (OCP) were used during the investigation. The semi-integral curve derived from CV measurements showed that the reduction of Ni(II) was a quasi-reversible process. And the standard reaction rate constant of the order ≈ 10⁻³ cm s⁻¹, determined by Nicholson method, placed the redox reaction of Ni in the quasi-reversible range per Matsuda-Ayabe criteria. The apparent standard potential and activity coefficient of Ni(II) were studied by EMF measurements. According to the standard apparent potentials at different temperatures, the values of enthalpy and entropy changes were −269.293 kJ mol⁻¹ and 0.0965 kJ mol⁻¹ K⁻¹, respectively. CA results showed that deposition of metal Ni on the tungsten cathode was an instantaneous nucleation process. Additionally, the diffusion coefficients calculated by semi-integral technique showed that the temperature dependence was consistent with Arrhenius’ law. And the activation energy for diffusion of Ni(II) is 57.87 kJ mol⁻¹. Finally, the exchange current density of Ni on tungsten electrode was explored by linear polarization method.

这项工作涉及的是在673 K温度下LiCl-KCl熔体中Ni（II）的电化学行为。在研究过程中，使用了循环伏安法（CV），方波伏安法（SWV）和开路计时电位法（OCP）。 。从CV测量得出的半积分曲线表明，Ni（II）的还原是准可逆的过程。并且标准反应速率常数约为≈10 ^-3 cm s ^-1通过Nicholson方法测定，根据Matsuda-Ayabe标准，将Ni的氧化还原反应置于准可逆范围内。通过EMF测量研究了Ni（II）的表观标准电位和活度系数。根据在不同温度下的标准表观电势，焓和熵变的值分别为-269.293 kJ mol ^-1和0.0965 kJ mol ^-1 K ^-1。CA结果表明，金属Ni在钨阴极上的沉积是瞬时成核过程。另外，通过半积分技术计算的扩散系数表明温度依赖性符合阿伦尼乌斯定律。Ni（II）扩散的活化能为57.87 kJ mol ^-1。最后，通过线性极化方法研究了镍在钨电极上的交换电流密度。