电解CO_2储存可再生电能的N-甲基吡咯烷酮/四丁基高氯酸铵电解液研究

Electrochemical Reduction of CO_2 in N-Methyl Pyrrolidone /Tetrabutylammonium Perchlorate Electrolyte for Renewable Electrical Energy Storage

将CO_2转化为甲醇,用作燃料或基础化工原料,是实现CO_2资源化利用的重要途径之一。研究设计了一种新型双室隔膜电解池,能够在N-甲基吡咯烷酮(NMP)/四丁基高氯酸铵(TBAP)溶液中,以可再生电能为能源,用电化学催化还原的方法将CO_2转化为CO,然后用工业制甲醇的传统方法将CO氢化还原为甲醇。循环伏安测试结果表明,CO_2在Au电极上发生了电还原反应;恒电位电解测试结果表明,阴极电流密度最高可达6.6 m A×cm^(-2);气相色谱检测结果表明,阴极气相反应产物主要为CO,生成CO的电流效率最高可达93%。由于CO_2电还原反应自身有H_2O生成,阴极表面有H2析出。扫描电镜(SEM)检测表明,Au电极表面没有附着物生成。在N-甲基吡咯烷酮/四丁基高氯酸铵溶液中电还原CO_2,具有电解液性质稳定、电极不中毒的优点,因而具有潜在的工业化应用前景。

CO2 conversion into methanol is considered as a promising route for CO2 recycling as methanol is aliquid fuel and fundamental chemical in the chemical industry. In this work, a novel two-chamber electrolysiscell was proposed for electrochemical reduction of CO2 into CO in N-Methyl pyrrolidone（NMP）/tetrabutylammonium perchlorate （TBAP） electrolyte using renewable electricity as the externalelectrical energy supply. The obtained CO can then react with HE to produce methanol. Cyclic voltammogramcurves indicate that CO2 reduction happens on Au electrode. The potentiostatic electrolysis curve shows that thecurrent density reaches to 6.6 mA.cm-2. The gas chromatogram results show that the main gaseous product isCO, and the highest Faradaic efficiency of CO is 93%. H2 is evolved due to the presence of H20 in the catholyte.SEM results indicate that no adsorbate is observed on the surface of the Au electrode. During long termelectrolysis processes, the electrolyte keeps stable, and the cathode exhibits high activity towards CO2 reduction.The electrochemical reduction of CO2 into CO in NMP/TBAP electrolyte is promising for industrialapplications.