CO_2一步电化学转化技术的可行性研究

Study on Feasibility of One-step Electrochemical Conversion of CO_2

目的研究长期载人航天任务中舱室CO2电化学还原为代氢燃料CO技术。方法研究不同温度、压力下,0.5mol·L-1KHCO3水溶液中Pb电极上CO2电化学还原的行为,并进行电极反应动力学研究。结果常压下,温度为273K,电解电位-1.5V,产生的CO法拉第效率最大,为16.1%;常温下,压力为1.2MPa,电解电位-0.5V,产生的CO法拉第效率最大,为19.8%。通过动力学研究,得阴极还原生成CO的反应级数为0.34。结论载人航天器中应用电化学还原CO2为代氢燃料CO的途径是可行的。

Objective To develope a technology of electrochemical reduction of CO2 to CO in manned space cabin. Method Electrochemical reduction of CO2 with a Pb electrode in 0.5 mol/L KHCO3 aqueous solution was studied under different temperature and different pressure and the electrode kinetics was investigated. Result Under normal ambient pressure, the temperature of 273 K and the electric potential of - 1. 5 V, the faradaic efficiency of CO reached a maximum value of 16. 1%. Under normal ambient temperature, the pressure of l. 2 MPa and the potential of -0.5 V, the faradaic efficiency reached the highest value of 19.8%. Kinetics analysis demonstrated that the reaction order was 0.34 for electrochemical reduction of CO2 to CO. Conclusion It is feasible for the electrochemical reduction of CO2 to CO to be applied in manned spacecraft.