La3 离子在EMIMBF4离子液体中的电化学行为研究

Electrochemical study on electrodeposition of La3 in EMIMBF4 ionic liquid

摘要:

采用三电极体系对La3 离子在0.01mol/L LaCl3－0.1mol/L LiCl－EMIMBF4离子液体电化学还原制备金属镧的电极过程进行了研究。循环伏安法结合恒电位电解法研究结果表明La3 离子的电化学还原是不可逆过程，还原步骤为一次完成La3 3e-→La。计时电流法结合恒电位电解法研究表明La3 离子的还原过程受到扩散控制，传递系数和扩散系数分别为0.0492和(1.07-1.19)?0-6 cm2/s。

关键词:电化学;离子液体;电沉积;金属镧

Abstract:

The electrodeposition of lathanium on a Pt electrode was investigated in 0.01mol/L LaCl3－0.1mol/L LiCl－EMIMBF4 ionic liquid. The cyclic voltammetry, chronoamperometry and constant voltage electrolysis techniques were employed. The results of the cyclic voltammogram and the XRD spectrum of deposits after electrolysis under constant voltage have supported a one step electrodeposition mechanism of lanthanum, La3 3e-→La. The results also indicated that the reduction of La3 ion was irreversible. The transfer coefficient and the diffusion coefficient of La3 ion in 0.01mol/L LaCl3－0.1mol/L LiCl－EMIMBF4 ionic liquid were calculated as 0.0492 and (1.07-1.19)?0-6 cm2/s, respectively.

Key words:Electrochemistry; Ionic liquid; Electrodeposition; Lanthanum