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

MAO Xinbiao; LIU Ying; CHEN Da; CHEN Zhaoyang; MA Chun'an

doi:10.11949/j.issn.0438-1157.20161814

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

更新时间：2025-12-10

- Electrochemical reduction of CO₂in [NH₂-emim]Br/[Bmim]BF₄ ionic liquid composite
- CIESC Journal Issue 5, Pages: 2027-2034(2017)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161814
  CLC： 64
- Online First：05 May 2017，
  
  Published：05 May 2017
- 稿件说明：
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MAO Xinbiao, LIU Ying, CHEN Da, et al. Electrochemical reduction of CO₂in [NH₂-emim]Br/[Bmim]BF₄ ionic liquid composite[J]. CIESC Journal, 2017, (5): 2027-2034. DOI: 10.11949/j.issn.0438-1157.20161814.
DOI：

MAO Xinbiao, LIU Ying, CHEN Da, et al. Electrochemical reduction of CO₂in [NH₂-emim]Br/[Bmim]BF₄ ionic liquid composite[J]. CIESC Journal, 2017, (5): 2027-2034. DOI: 10.11949/j.issn.0438-1157.20161814. DOI：

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。

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]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.

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