Electrochemical reduction of CO2 in [NH2-emim]Br/[Bmim]BF4 ionic liquid composite

doi:10.11949/j.issn.0438-1157.20161814

Abstract

Abstract:

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 [NH₂-emim]Br/[Emim]BF₄, [NH₂-emim]Br/[Bmim]BF₄, and [NH₂-emim]Br/[Bmim]PF₆were 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]BF₄was 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 CO₂electrochemical reduction.

Key words: carbon dioxide, ionic liquids, binary mixture, electrochemistry, cyclic voltammetry

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（[NH₂-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[NH₂-emim]Br的黏度26.691 Pa·s、电导率0.1130 mS·cm^-1，CO₂的溶解饱和度82%（摩尔分数），将不同含量的[NH₂-emim]Br与[Emim]BF₄、[Bmim]BF₄、[Bmim]PF₆组成二元复合离子液体，并用于CO₂电化学还原研究，循环伏安研究表明，CO₂在[NH₂-emim]Br（0.5%）-[Bmim]BF₄复合离子液体中的还原峰电位较[Bmim]BF₄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CO₂电化学还原离子液体体系。

关键词: 二氧化碳, 离子液体, 二元混合物, 电化学, 循环伏安

CLC Number:

MAO Xinbiao, LIU Ying, CHEN Da, CHEN Zhaoyang, MA Chun'an. Electrochemical reduction of CO₂in [NH₂-emim]Br/[Bmim]BF₄ ionic liquid composite[J]. CIESC Journal, 2017, 68(5): 2027-2034.

毛信表, 刘莹, 陈达, 陈赵扬, 马淳安. [NH₂-emim]Br/[Bmim]BF₄离子液体中二氧化碳的电化学还原[J]. 化工学报, 2017, 68(5): 2027-2034.

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Electrochemical reduction of CO₂in [NH₂-emim]Br/[Bmim]BF₄ ionic liquid composite

[NH₂-emim]Br/[Bmim]BF₄离子液体中二氧化碳的电化学还原

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