离子液体中铈的电沉积行为  

Electrodeposition Behaviors of Cerium in Ionic Liquid

作　　者：玉山江.哈斯木 刘瑞泉[1] 米红宇[1] 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046

出　　处：《稀有金属》2014年第3期432-440,共9页Chinese Journal of Rare Metals

基　　金：新疆维吾尔自治区高校科研计划项目(XJEDU2012I05);国家自然科学基金项目(21063013)资助

摘　　要：以一氯丁烷、N-甲基咪唑和KPF6为原料合成了1-丁基-3-甲基咪唑六氟磷酸盐离子液体([BMIM]PF6),用红外光谱(IR)法对合成的[BMIM]PF6进行了结构分析。用循环伏安法分别测试了[BMIM]PF6的电化学窗口和在[BMIM]PF6中加入乙二醇(EG)和CeCl3形成的体系([BMIM]PF6-EG-CeCl3)中Ce(III)的电化学行为。结果表明,在80℃时[BMIM]PF6的电化学窗口为4.0 V,[BMIM]PF6-EG-CeCl3体系中Ce(III)的电沉积是受扩散控制的不可逆电极过程,此过程传递系数α为0.05,扩散系数D0为2.45×10-6cm2·s-1。通过扫描电镜(SEM)观察了Ce在Cu片表面上电沉积层的形貌,发现随着沉积电势的增加,金属铈镀层的颗粒呈从小到大的变化规律。用X射线能量色散谱(EDS)分析了该电沉积层成分发现电沉积镀层为纯金属铈及其氧化物。The 1 -butyl-3-methylimidazolium hexafluorophosphate （ [ BMIM ] PF6 ） ionic liquid was synthes!zed by 1 -Chlorobutane, N- Methylimidazole and KPF6. The structure of ionic liquid was investigated by infrared （IR） spectrum. The electrochemical windows of [ BMIM ] PF6 and the electrochemical behaviors of Ce （Ⅲ） in [ BMIM ] PF6 containing ethylene glycol （EG） and CeC13 （ [ BMIM ] PF6- EG-CeC13 ） were studied by cyclic voltammetry. The results indicated that the electrochemical window of [ BMIM ] PF6 was 4.0 V and the electrodeposition of Ce（Ⅲ） from [ BMIM] PF6-EG-CeCI3 was controlled by diffusion and irreversible growth process at 80 ℃ . The cathodal transfer coefficient （a） and diffusion coefficient （ DO ） of Ce （Ⅲ） in [ BMIM ] -PF6-CeC13-EG were： a = 0.05, Do = 2.45 × 10 -6 cm^2 ·s^-1 The surface morphology of Ce electrodeposited on copper foil was characterized by means of scanning electron microscopy （SEM）. The results indicated that the size of electrodeposit increased with cathodic potentials increasing. The composition of Ce was analyzed by energy dispersive spectroscope （EDS） and the results indicated that the surface electrodeposit was pure cerium and its nxide.

关 键 词：铈 离子液体 循环伏安 电化学窗口 电沉积 

分 类 号：O646[理学—物理化学]