LiF–NaF–KF熔盐体系中Ce^(3+)的电化学行为

Electrochemical behavior of Ce(III) ion in LiF–NaF–KF melts

采用循环伏安法、开路计时电位法和方波伏安法,在含4.32×10 4mol/cm3CeF3的LiF–NaF–KF熔盐(温度873 K)中研究了Ce3+的阴极电化学行为,结果表明,Ce3+的阴极还原是一个一步电子得失的不可逆过程,主要受扩散控制。在上述熔盐中,以Ni为阴极,采用恒电流密度145 mA/cm2电解12 h,所得到的电沉积产物为Ce金属以及铈镍合金Ce2Ni7。

The electrochemical behavior of Ce（III） ion in a LiF NaF-KF melt containing 4.32 ×10-4 mol/cm3 CeF3 at 873 K was studied by cyclic voltammetry, open-circuit chronopotentiometry, and square wave voltammetry. The results showed that the cathodic reduction of Ce3＋ is a one- step irreversible diffusion-controlled reaction. Constant current electrolysis was used for electrodepositing Ce on a Ni substrate in the melt. Cerium metal and intermetallic compound of Ce2Ni7 can be obtained at a current density of 145 mA/cm2.