Abstract
Layered perovskite oxide LaBa0.5Sr0.25Ca0.25Co2O5+δ (LBSCaCO) is studied as a potential cathode material for intermediate temperature solid oxide fuel cells (IT-SOCFs). Ca-free sample LaBa0.5Sr0.5Co2O5+δ (LBSCO) is also investigated for comparison. The thermal expansion coefficient (TEC) value is reduced from 26.2 × 10−6 K−1 to 20.0 × 10−6 K−1 by Ca doping. The electrical conductivity of LBSCaCO is above 500 S cm−1 from room temperature to 800 °C. Substitution of Sr by Ca can effectively enhance the electrochemical performance. The area specific resistance (ASR) values of LBSCaCO and LBSCO are 0.075 Ω cm2 and 0.084 Ω cm2 at 800 °C, respectively. Moreover, LBSCaCO cathode achieves an excellent outputting of 662 mW cm−2 at 800 °C. Based on these results, Ca doped layered perovskite LBSCaCO can be a cathode candidate material for IT-SOFC application.
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