Abstract
La 0.6Sr 0.4Co 0.2Fe 0.8O 3 (LSCF) and LSCF–Ce 0.8Gd 0.2O 3 (GDC) composite cathodes on YSZ electrolytes were studied for potential applications in low-temperature solid oxide fuel cells (SOFCs). Impedance spectroscopy measurements were performed in oxygen partial pressures ranging from 10 −3 to 1 atm over a temperature range from 500 to 750 °C. The LSCF electrodes yielded low-current interfacial resistance values that were a factor of 10 lower than for (La,Sr)MnO 3 cathodes. The addition of 50 vol.% GDC to LSCF resulted in an additional factor of ≈10 decrease in the polarization resistance. Polarization resistance values for the LSCF–GDC cathodes were as low as 0.01 Ω cm 2 at 750 °C and 0.33 Ω cm 2 at 600 °C.
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