A comparative study of electrodes in the direct synthesis of CH4 from CO2 and H2O in molten salts. (20th July 2017)

• Record Type: Journal Article
• Authors: Ji, Deqiang; Liu, Yue; Li, Zhida; Yuan, Dandan; Yang, Guanjian; Jiang, Mengpei; Wang, Yuhang; Yu, Yanyan; Wu, Hongjun
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 29(2017)
• Page Start: 18156
• Page End: 18164
• Publication Date: 2017-07-20
• Subjects: Carbon dioxide -- Water -- Electrochemical reduction -- Methane -- Electrode; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.04.152
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Since the Industrial Revolution, the heavy reliance on the limited fossil energy has emitted huge number of CO2 into the air and led to a severely global warming. We propose a new green technology to moderate greenhouse gas CO2 emission and transform it into low-carbon renewable energy in this paper. Through this manner, electricity is transformed into chemical energy. CO2 and H2 O is directly simultaneous electrolysis under constant 0.25 A with 30 cm 2 nickel anode and 30 cm 2 iron cathode in a 600 °C alkali carbonate with LiOH electrolyte in mole ratio of nH :nC = 0.15:1, achieving the storage of electricity to chemical energy. This electrolysis provides a gaseous product comprising 45.9% methane, 53.1% H2, 0.92% CO and trace amounts of longer (than methane) hydrocarbons. Simultaneously, the current efficiency is still ∼51% for 60 min. Highlights: A green technology to transform CO2 /H2 O into low-carbon energy is proposed. Methane can be obtained in only one-step without Fischer–Tropsch synthesis. Electrolyte can regenerate to the original state with supplement of CO2 /H2 O. The Ni anode and Fe cathode are comparatively stable after electrolysis.