离子液体中Cu纳米电极上电化学还原CO2合成碳酸二甲脂

在不同的温度和时间下煅烧Cu片得到CO₂前驱体，再由Cu₂O前驱体电化学还原得到铜电极（Oxide reduced copper， OR-Cu）.通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）等测试手段对材料进行了表征，通过循环伏安（CV）和气质联用仪(GC-MS)等表征手段探讨了材料对CO₂的电化学催化性能以及对电合成DMC产率的影响.结果表明，OR-Cu电极的晶界以及Cu₂O初始厚度是影响材料电催化性能的主要因素.700 ℃下煅烧2 h的Cu₂O前驱体，再经电化学还原所得到的电极具有明显的晶界及合适的Cu₂O初始厚度，具有最高的电催化活性,以其作为电极合成DMC的产率在室温下可达到87%.

Electrochemical Reduction of CO_2 at Copper Nanoparticles Cathode in Ionic Liquid BMIMBF_4:Synthesis of Dimethyl Carbonate

New catalysts are needed to achieve lower overpotentials for desirable products during the electroreduction ofCO₂.In this study,copper nanoparticles were obtained by electrochemical method.These obtained electrodes were characterized by XRD,SEM and TEM.The electrochemical properties of the obtained electrode for electrocatalytic reduction of CO₂ in the ionic liquid,1-butyl-3-methylimidazolium- tetrafluoborate (BMIMBF4),have been evaluated by cyclic voltammogram and potentiostatic electrolysis.Results showed that,the reduction peak of CO₂ appeared at -1.7 (vs. Ag) which was more positive 0.1 V than that obtained on copper electrode,meanwhile,the current density was 12 mA higher.In addition,the electrolysis experiments have been carried out under mild conditions without any toxic solvents,catalysts and supporting electrolytes,affording the dimethyl carbonate in 87% yield.