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Chin. J. Process Eng. ›› 2015, Vol. 15 ›› Issue (5): 837-841.DOI: 10.12034/j.issn.1009-606X.215228

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Electrocatalytic Reduction of CO2 in Tetrabutylammonium Perchlorate-Propylene Carbonate Solution

LI Lu WANG Xiao-chun YANG Dong-wei WANG Qin SHI Jin   

  1. Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering，Kunming University of Science and Technology
  • Received:2015-06-02 Revised:2015-07-07 Online:2015-10-20 Published:2015-10-20
  • Contact: SHI Jin

CO2在四丁基高氯酸铵-碳酸丙烯酯溶液中的电催化还原

李露 王晓春 杨冬伟 王琴 施锦   

  1. 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院
  • 通讯作者: 施锦

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Abstract: Tetrabutylammonium perchlorate (TBAP) and propylene carbonate (PC) solution was used as catholyte electrolyte solution for CO2 reduction, and a novel two-chamber electrolysis cell was designed so that CO2 could be converted to CO in TBAP-PC solution, while water oxidation was carried out in the anode chamber. The results show that the electrochemical window in TBAP-PC electrolyte solution reaches -2.48 V (vs. I-/I3-), CO2 can be reduced to CO in TBAP-PC solution. The cathodic current density keeps stable at about 7.4 mA/cm2. The main gas evolved at the cathode is CO. Faradaic efficiency of CO formation reaches 93%. Owing to the presence of residual water in the catholyte, hydrogen is evolved at the cathode in competing with CO formation, Faradaic efficiency of H2 reaches 5%. There are no impurities adsorbed on the surface of Au electrode.

Key words: CO2, electrochemical reduction, organic electrolyte solution, Au electrode

摘要： 设计了一种新型双室电解池，以四丁基高氯酸铵(TBAP)-碳酸丙烯酯(PC)溶液为阴极电解液，高效稳定地将CO2转化为CO. 结果表明，TBAP-PC溶液的电化学窗口达-2.48 V (vs. I-/I3-), CO2可在其中发生电还原反应；阴极电流密度稳定在7.4 mA/cm2，阴极气相产物主要为CO，生成CO的电流效率最高约为93%；由于阴极电解液中含残留水，阴极表面有氢气析出，电流效率约为5%；金电极表面无吸附物，电极未失活.

关键词: 二氧化碳, 电还原, 有机电解液, 金电极

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