CO_2在四丁基高氯酸铵-碳酸丙烯酯溶液中的电催化还原

Electrocatalytic Reduction of CO_2 in Tetrabutylammonium Perchlorate-Propylene Carbonate Solution

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 m A/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.

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 m A/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.