Electrochemical performance of a low-temperature solid oxide fuel cells with cobalt-based perovskite as the cathode☆

Due to the long start-up time of high-temperature solid oxide fuel cells, the study of low-temperature Solid Oxide Fuel Cells (SOFCs) has gradually become a hot topic in the field of fuel cells. This study presents a highperformance low-temperature SOFC featuring a cathode composed of the cobalt-based perovskite material Ba0.5Sr0.5Co0.8Fe0.2O3-delta. The electrolyte is a 7:3 mixture of samarium-doped ceria (SDC) and NCAL powder, The cell's unique structure, consisting of nickel foam (Ni) - NCAL/3NCAL - 7SDC/BSCF, is formed through a simple co-pressing technique. Under the condition of 550 degrees C in a hydrogen atmosphere, this SOFC achieves a remarkable peak power density of 709.64 mW cm- 2, with an exceptionally low polarization resistance (Rp) of 0.132 Omega cm2. Furthermore, even at the temperature of 425 degrees C with pure hydrogen as the fuel, the cell sustains an impressive peak power density of 302.93 mW cm- 2. These findings validate the practicality of cobalt-based perovskites for being taken as cathodes in the NCAL system of fuel cells and have potential research value.