A novel post-treatment to calcium cobaltite cathode for solid oxide fuel cells. (25th January 2018)

• Record Type: Journal Article
• Authors: Yu, Shancheng; Zhang, Guiping; Chen, Han; Guo, Lucun
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 4(2018)
• Page Start: 2436
• Page End: 2442
• Publication Date: 2018-01-25
• Subjects: Solid oxide fuel cell -- Calcium cobaltite cathode -- Hydrogen peroxide treatment -- Electrochemical performance; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.12.040
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The calcium cobaltite (CCO) cathodes are post-treated by dipping in the hydrogen peroxide (H2 O2 ). The electrochemical properties are investigated by the electrochemical impedance spectra (EIS) and current-voltage test in the symmetrical cell and single cell, respectively. The phase structure and morphology of the cathodes are characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The experiment results show that the mesopores are created on the surface of the cathode particles and the pore channels of the cathode are cleaned up after leaching with 10 wt % H2 O2, resulting in a remarkable decreasing of the area specific resistance (e.g. only 42.5% of that for the untreated cathode at 800 °C). The single cell with treated cathode is about 2 times the peak power density of the cell with untreated cathode, signifying the post-treating method may be promising. Graphical abstract: Highlights: The cathode performance is improved by post-treating with H2 O2 . The formation of mesopores increases oxygen reduction reaction active sites. The leached pore channels is beneficial for the gas transport.