MoO2-based cathode for CO2 and H2O electrolysis. (27th July 2016)

• Record Type: Journal Article
• Authors: Hou, Xiaoxue; Zhao, Kai; Yang, Jung-Il; Ha, Su
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 28(2016)
• Page Start: 11895
• Page End: 11899
• Publication Date: 2016-07-27
• Subjects: Co-electrolysis -- CO2 electrolysis -- MoO2-based cathode -- Syngas production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.05.080
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This short communication describes a novel MoO2 -based cathode and its potential application for solid oxide electrolysis cells. Electrochemical performances of the MoO2 -based cathode are investigated with respect to a commercial Ni/YSZ-based cathode for both co-electrolysis (of H2 O and CO2 ) and electrolysis of only CO2 at 750 °C. Under the co-electrolysis mode, the MoO2 -based cell and the Ni/YSZ cell show a similar electrochemical performance, while in the CO2 electrolysis mode, the MoO2 -based cell demonstrates a much improved electrocatalytic activity compared with the Ni/YSZ cell. This improved electrochemical activity of the MoO2 -based cathode under the CO2 electrolysis mode is further investigated by its electrochemical impedance spectroscopy (EIS) study. According to our EIS study, the polarization resistance of the MoO2 -based cell is 67% lower than that of the Ni/YSZ-based cell under the open circuit potential. A performance stability study indicates that the MoO2 -based cell exhibits a relatively low performance degradation under the CO2 electrolysis mode during its 10-h constant voltage test, and low carbon amount (6.6 wt.%) is detected after the performance stability measurement. These findings suggest the advantages of applying the MoO2 -based cathode for the CO2 electrolysis. Highlights: MoO2 -based electrode was fabricated using electrostatic spray deposition. MoO2 -based electrode was tested for CO2 /H2 O electrolysis modes at 750 °C. MoO2 cathode shows an improved CO2 electrolysis activity than Ni/YSZ cathode. MoO2 cathode shows a lower polarization resistance than Ni/YSZ cathode.