Selection of Low‐Cost Ionic Liquid Electrocatalyst for CO2 Reduction in Propylene Carbonate/Tetrabutylammonium Perchlorate,ChemElectroChem

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Selection of Low‐Cost Ionic Liquid Electrocatalyst for CO2 Reduction in Propylene Carbonate/Tetrabutylammonium Perchlorate
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-14 , DOI: 10.1002/celc.201800545
Tian-You Chen ₁ , Jin Shi ₁ , Feng-Xia Shen ₁ , Jian-Zheng Zhen ₁ , Yun-Fei Li ₁ , Feng Shi ₂ , Bin Yang ₁ , You-Jian Jia ₁ , Yong-Nian Dai. ₁ , Yu-Qi Hu ₁

Affiliation

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.

中文翻译：

碳酸亚丙酯/高氯酸四丁铵中低成本CO 2还原离子液体电催化剂的选择

将二氧化碳（CO ₂）电化学还原为一氧化碳（CO）已引起越来越多的关注，因为该方法为CO ₂循环利用提供了新途径。由于CO ₂具有化学惰性，因此该反应需要很高的超电势。因此，非常需要开发一种能加速该反应的电催化剂。在目前的工作中，我们研究了许多咪唑鎓离子液体（IL），目的是寻找一种低成本，高效率的均相催化剂。相比之下，1-丁基-3-甲基咪唑鎓氯化物（[Bmim] [Cl]）被选为最具成本效益的产品。为了进一步降低[Bmim] [Cl]的成本，我们将[Bmim] [Cl]加入碳酸亚丙酯（PC）/高氯酸四丁铵（Bu ₄NClO ₄），并将其用作电催化剂。我们的实验结果表明，[Bmim] [Cl]对CO _2的还原具有很高的催化作用。基于电化学阻抗谱研究了[Bmim] [Cl]的催化机理。它被解释如下：CO ₂首先被还原为高能量CO ₂^.-通过单电子转移自由基。所产生的CO ₂^.-自由基进一步与[BMIM] ⁺，产生了复杂的[CO的形成₂ -Bmim]。因此，减少了CO ₂还原的活化能。

更新日期：2018-06-14

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