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- Title
Selection of Low‐Cost Ionic Liquid Electrocatalyst for CO<sub>2</sub> Reduction in Propylene Carbonate/Tetrabutylammonium Perchlorate.
- Authors
Chen, Tian‐You; Shi, Jin; Shen, Feng‐Xia; Zhen, Jian‐Zheng; Li, Yun‐Fei; Yang, Bin; Jia, You‐Jian; Dai., Yong‐Nian; Hu, Yu‐Qi; Shi, Feng
- Abstract
Abstract: Electrochemical reduction of carbon dioxide (CO2) to carbon monoxide (CO) has attracted increasing attention, because this method provides a new route for CO2 recycling utilization. As CO2 is chemically inert, this reaction requires a high over‐potential. Therefore, it is highly desirable to develop an electrocatalyst to accelerate this reaction. In the present work, we have investigated numerous imidazolium ionic liquids (ILs) with the aim of looking for a low‐cost homogeneous catalyst with high efficiency. By comparison, 1‐butyl‐3‐methylimidazolium chloride ([Bmim][Cl]) has been selected as the most cost‐effective. To further reduce the cost of [Bmim][Cl], we added [Bmim][Cl] into propylene carbonate(PC)/tetrabutylammonium perchlorate (Bu4NClO4), and used it as the electrocatalyst. Our experimental results show that [Bmim][Cl] has a high catalytic effect for CO2 reduction. The catalytic mechanism of [Bmim][Cl] has been discussed based on electrochemical impedance spectroscopy. It is explained as follows: CO2 was first reduced to the high‐energy CO2.− radical through a one‐electron transfer. The generated CO2.− radical further reacts with [Bmim]+, resulting in the formation of a complex [CO2−Bmim]. Thus, the activation energy of CO2 reduction has been reduced.
- Subjects
IONIC liquids; ELECTROCATALYSTS; CARBON dioxide reduction; PROPYLENE carbonate; HOMOGENEOUS catalysis
- Publication
ChemElectroChem, 2018, Vol 5, Issue 16, p2295
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201800545