A new series of cobalt-based perovskite (Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ (GSFC-x, x = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) cathodes to aid in the development of intermediate temperature solid oxide fuel cells are reported. All the perovskites showed the coexistence of cubic and orthorhombic phases. To determine their suitability, the thermal properties dependence on the cobalt content were investigated via dilatometry, thermogravimetry and differential scanning calorimetry. GSFC-x exhibited the promising activity of the oxygen reduction reaction and ion transport from a comparable study. The thermal expansion coefficient of rich-cobalt samples showed a more compatible value to the common electrolyte than other similar cathodes. By varying Co doping, compromises were made between thermal expansion and electrical conductivity. Furthermore, phase stability was observed.
- Differential scanning calorimetry
- Perovskite cathode
- Thermal analysis