Abstract
Cathode material SmBaCoFeO5+δ (SBCF) was synthesized by a combined EDTA-citrate complexing sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), AC impendence spectroscopy, respectively. The results showed that the SBCF cathode had an orthorhombic perovskite-structure and formed a good contact with the Ce0.9Gd0.1O1.95 (GDC) electrolyte after sintering at 950°C for 2h. Based on symmetric cell test, area specific resistance of SBCF on GDC electrolyte was as low as 0.1Ω cm2 at 800°C. The maximum power densities of a cell using the SBCF cathode are 431 mWcm−2, 313mWcm−2 and 200mWcm−2 at 800°C, 750°C and 700°C, respectively. Preliminary results demonstrate that SBCF is a very promising cathode material for application in intermediate-temperature solid oxide fuel cells (IT-SOFCs).
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