TiCl4在离子液体［ emim ］ BF4及［ bmim ］ PF6中的电化学性能

The electrochemical property of Ti Cl_4 in the ionic liquids of [emim]BF_4 and [bmim]PF_6

在[emim]BF4离子液体中Pt片电极上通过恒电位电沉积制备出金属Ti。采用液/液连续萃取方法对亲水性离子液体[emim]BF4进行提纯,高纯水多次洗涤方法对疏水性离子液体[bmim]PF6进行提纯。在[emim]BF4和[bmim]PF6两种离子液体中研究了Ti Cl4的循环伏安,在含有Ti Cl4的[emim]BF4离子液体中,研究了Pt片电极上的恒电位电沉积。结果表明,连续萃取方法提纯[emim]BF4及高纯水多次洗涤[bmim]PF6,可使两种离子液体纯度分别达到实验要求;在离子液体[emim]BF4中,在Pt片电极上,在-1.8 V(vs Pt)下电解2 h,沉积物中的Ti含量达82.8%。

Titanium was successfully electrodeposited on Pt electrode from 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid by the constant potential electrolysis .1-Ethyl-3-methylimidazolium tetraflu-oroborate （[emim]BF4） ionic liquid was purified by liquid/liquid continuous extraction, and 1-butyl-3-methylimidazolium hexafluorophosphate （ [ bmim] PF6 ） ionic liquid was purified by multiple washing with milipore water.Cyclic voltammograms of titanium tetrachloride （TiCl4） were studied in [emim]BF4 and [ bmim] PF6 .Constant potential electrolysis was studied on Pt electrode in [ emim] BF4 containing TiCl 4 . [ emim] BF4 and [ bmim] PF6 can reached experimental requirements by the above purification methods . Constant potential deposition experiments showed that the purity of titanium electrodeposits on Pt elec -trodes was 82.8%at -1.8 V （vs Pt） for 2 h electrolysis at room temperature .