A novel electrolysis cell for CO2 reduction to CO in ionic liquid/organic solvent electrolyte
A novel electrolysis cell for CO2 reduction to CO in ionic liquid/organic solvent electrolyte
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DOI：
10.1016/j.jpowsour.2014.02.072
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发表时间：
2014-08
影响因子：
9.2
通讯作者：
Jin Shi;Feng Shi;Ning Song;Jian-xiong Liu;Xikun Yang;Jia Youjian;Z. Xiao;Ping Du
中科院分区：
文献类型：
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作者：
Jin Shi;Feng Shi;Ning Song;Jian-xiong Liu;Xikun Yang;Jia Youjian;Z. Xiao;Ping Du
研制了一种在离子液体/有机溶剂电解液中将CO2还原为CO的新型电解槽。电解槽由离子交换膜(Nafion117)分成两个隔室。阴极室填充CO2饱和的1-丁基-3-甲基咪唑三氟甲磺酸([Bmim][CF3SO3])/碳酸亚丙酯(PC)溶液。阳极室内装满了0.1M的硫酸水溶液。采用银箔和石墨棒分别作为阴极和阳极。在该电解槽中，可以在非水电解液中进行CO2还原，在水溶液中进行H2O氧化。因此，CO可以由CO2和H2O生成。由于CO2在非水电解液中的高溶解度，CO生成的法拉第效率很高，在−为1.72V(VS铂丝)时达到90.1%。电解3h后，阴极上没有观察到有毒物质。银电极对CO_2还原为CO表现出很高的电催化活性。
A novel electrolysis cell has been developed for CO2reduction to CO in an ionic liquid/organic solvent electrolyte. The electrolysis cell is separated into two compartments by an ion-exchange membrane (Nafion117). The cathode compartment is filled with a CO2saturated 1-butyl-3-methyl-imidazolium trifluoromethanesulfonates ([Bmim][CF3SO3])/propylene carbonate (PC) solution. The anode compartment is filled with a 0.1 M H2SO4aqueous solution. A Ag foil and a graphite rod are used as the cathode and the anode respectively. In this electrolysis cell, CO2reduction can be carried out in the nonaqueous electrolyte, and H2O oxidation can be carried out in the aqueous solution. Thus CO can be produced from CO2and H2O. Owing to the high solubility of CO2in the nonaqueous electrolyte, the Faradaic efficiency of CO formation is high, reached 90.1% at −1.72 V (vs Pt wire). After 3 h electrolysis, no poisonous species are observed on the cathode. The Ag electrode exhibits a high electrocatalytic activity for CO2reduction to CO.