[NH_2-emim]Br/[Bmim]BF_4离子液体中二氧化碳的电化学还原  

Electrochemical reduction of CO_2 in [NH_2-emim]Br/[Bmim]BF_4 ionic liquid composite

作　　者：毛信表[1] 刘莹[1] 陈达[1] 陈赵扬[1] 马淳安[1] 

机构地区：[1]浙江工业大学化学工程学院绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《化工学报》2017年第5期2027-2034,共8页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2012CB722604);国家自然科学基金项目(21376220);浙江省公益性技术应用研究计划项目(2014C31159)~~

摘　　要：以2-溴乙胺氢溴酸和N-甲基咪唑盐为原料合成了氨基功能化离子液体1-(2-胺乙基)-3-甲基咪唑溴盐([NH_2-emim]Br),用~1H NMR和IR对所制备的离子液体进行了表征,测得25℃下[NH_2-emim]Br的黏度26.691 Pa·s、电导率0.1130 m S·cm^(-1),CO_2的溶解饱和度82%(摩尔分数),将不同含量的[NH_2-emim]Br与[Emim]BF_4、[Bmim]BF_4、[Bmim]PF6组成二元复合离子液体,并用于CO_2电化学还原研究,循环伏安研究表明,CO_2在[NH_2-emim]Br(0.5%)-[Bmim]BF_4复合离子液体中的还原峰电位较[Bmim]BF_4正移0.4 V,还原峰电流增大9倍,黏度降低为0.08227 Pa·s,电导率增大至1.317 mS·cm^(-1),是一种较好的CO_2电化学还原离子液体体系。Amine-functionalized ionic liquid, 1-（2-aminoethyl）-3-methyl imidazolium bromide （[NH2-emim]Br）, was synthesized from 2-bromoethylamine hydrobromide and N-methyl imidazole salt at reflux condition and characterized by 1H NMR and IR. Viscosity, electric conductivity and saturated carbon dioxide solubility in [NH2-emim]Br ionic liquid measured at 25℃ were 26.691 Pa·s, 0.1130 mS · cm^-1 and 82% by molar ratio, respectively. Binary ionic liquid composites of [NHE-emim]Br/[Emim]BF4, [NH2-emim]Br/[Bmim]BF4, and [NH2-emim]Br/[Bmim]PF6 were prepared at different mass ratios and used for electrochemical reduction of CO2. The results of cyclic voltammetry at room temperature showed that peak current of CO2 reduction in [NH2-emim]Br （0.5%）-[Bmim]BF4 was increased about 9 times than that in [Bmim]BF4 and reduction peak potential was shifted positively by 0.4 V. With viscosity decrease to 0.08227 Pa · s and electrical conductivity increase to 1.317 mS · cm^-1, the binary ionic liquid composite is a good ionic liquid system for CO2 electrochemical reduction.

关 键 词：二氧化碳 离子液体 二元混合物 电化学 循环伏安 

分 类 号：O64[理学—物理化学]