Electrochemical properties and durability of in-situ composite cathodes with SmBa_0.5Sr_0.5Co₂O_5+δ for metal supported solid oxide fuel cells

摘要

The electrochemical properties and long-term performance of an in-situ composite cathode comprised of SmBaSrCoO (SBSCO) and CeGdO (CGO91) are investigated for metal supported solid oxide fuel cell (MS-SOFC) application.The Area Specific Resistance (ASR) of an in-situ composite cathode comprised of 50 wt% of SBSCO and 50 wt% of CGO91 (SBSCO:50) is 0.031 Ω cm in the first stage of measurement at 700 °C; this value of ASR increases to 0.138 Ω cm after 1000 h. The ASR of SBSCO:50 (in-situ sample at 750 °C) is 0.014 Ω cm at the initial stage of measurement; the increase of ASR after 1000 h at 750 °C is only 0.067 Ω cm. These results suggest that the optimum temperature for in-situ firing of an SBSCO:50 cathode sample of MS-SOFC is higher than 700 °C, ideally around 750 °C.