Abstract
A-site Ca and B-site Fe co-doped SmBa1 − xCaxCo2 − yFeyO5 + δ (x = 0, y = 0; x = 0.25, y = 0; x = 0.25, y = 1.0) layered perovskites are prepared and evaluated as the cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The synergistic effects of co-doping on the crystal structure, chemical compatibility with the electrolyte, thermal expansion behavior, electrical conductivity, and electrochemical performance are investigated. Ca and Fe co-doping lowers the thermal expansion coefficient of SmBaCo2O5 + δ. The area specific resistance of the Ca and Fe co-doped sample (SmBa0.75Ca0.25CoFeO5 + δ-GDC) is decreased by 49.3%, compared with that of the undoped sample at 800 °C, based on a GDC electrolyte. Furthermore, the maximum power density of a GDC electrolyte-supported single cell with a SmBa0.75Ca0.25CoFeO5 + δ-GDC cathode is increased by 50.7% at 800 °C. The results indicate that the Ca and Fe co-doping layered perovskite SmBa0.75Ca0.25CoFeO5 + δ is an excellent cathode material for IT-SOFC applications.
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