Abstract
Abstract In this study, a new oxygen-deficient cathode material, Sm 0.5 Sr 0.5 Co 1− x Cu x O 3− δ (SSCCu) was developed. It is expected to enhance the efficiency of intermediate-temperature solid oxide fuel cells (IT-SOFCs). The structure, conductivity and electrochemical performance of SSCCu were examined as a function of copper content. The structure of Sm 0.5 Sr 0.5 Co 0.9 Cu 0.1 O 3− δ and Sm 0.5 Sr 0.5 Co 0.8 Cu 0.2 O 3− δ samples was a single orthorhombic perovskite phase. Second phase SrCoO 2.8 , however, formed in the Sm 0.5 Sr 0.5 Co 0.7 Cu 0.3 O 3− δ and Sm 0.5 Sr 0.5 Co 0.6 Cu 0.4 O 3− δ samples. The conductivity of the Sm 0.5 Sr 0.5 Co 0.7 Cu 0.3 O 3− δ cathode was higher than that of other samples. However, the Sm 0.5 Sr 0.5 Co 0.8 Cu 0.2 O 3− δ electrode exhibited the lowest overpotential of 25 mV at 400 mA cm −2 and the lowest area special resistance of 0.2 Ω cm 2 at 700 °C.
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