Abstract
Gd0.8Sr0.2CoO3-δ–x Sm0.1Ce0.9O1.95 (GSC-x, x=0–50wt.%) composite cathodes were prepared by Glycine-Nitrate Process followed by mixing GSC and SDC powder. The thermal stability and electrical conductivity of GSC-x composite cathodes have been investigated for the application in intermediate temperature solid oxide fuel cells (IT-SOFCs). The thermal expansion coefficient of GSC-x decreased with the addition of SDC. The electrical conductivities of GSC-x cathode with 0–30wt.% SDC were passed the line of 100 Scm−1. Especially for GSC-20, the conductivity of GSC-20 is more than 300 Scm−1 in temperature range of 600–750°C. The area specific resistance (ASR) of GSC-20 was only 0.080Ωcm2 at 750°C, much lower than that of GSC cathode (ASR=0.119Ωcm2). The thermal expansion coefficient of GSC-20 decreased to 80% TEC of GSC cathode.
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