Abstract
The electrochemical properties of Ba0.5Sr0.5Co0.8Fe0.2O3, Ba0.5Sr0.5Co0.8Fe0.2O3+Co3O4, and Ba0.5Sr0.5Co0.8Fe0.2O3+Co3O4+Ce0.8Sm0.15Nd0.05O2 as cathode materials on a zirconia solid electrolyte with a ceria buffer layer have been investigated. Impedance spectra are measured to investigate theircathodic polarization resistances in cells in a symmetric configuration. The Ba0.5Sr0.5Co0.8Fe0.2O3+Co3O4+Ce0.8Sm0.15Nd0.05O2 composite shows extremely low polarization resistance of 0.048Ωcm2 at 700°C, which is an improved value over the Ba0.5Sr0.5Co0.8Fe0.2O3 due to enhanced mixed ionic and electronic conductivity. This low polarization resistance is confirmed by conducting an electrochemical impedance spectroscopy analysis on a large tubular SOFC fabricated with the composite cathode. The tubular SOFC exhibits good cell performance of 0.400Wcm−2 under 0.7V and at 700°C and stable performance for 280h.
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