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0.01 mol/L LaCl3-0.1 mol/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)×10-6 cm2/s

Abstract:

The electrodeposition of lanthanum on a Pt electrode was investigated in 0.01 mol/L LaCl3-0.1 mol/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 pattern of deposits after electrolysis under constant voltage have supported a one step electrodeposition mechanism of lanthanum, La3+ + 3e-→La. The results also indicate that the reduction of La3+ ion is irreversible. The transfer coefficient and the diffusion coefficient of La3+ ion in 0.01 mol/L LaCl3-0.1 mol/L LiCl-EMIMBF4 ionic liquid are 0.0492 and (1.07-1.19)×10-6 cm2/s, respectively