Cobalt–free perovskites Ln_0.5Sr_0.5Fe_0.9Mo_0.1O_3–δ (Ln = lanthanide; LnSFM) were prepared via a sol–gel process. Pure rhombohedral phases were still not obtained for the samples (Ln = Sm and Gd) even sintered at 1300 °C. Thus, only the LaSFM, PrSFM and NdSFM compositions were assessed as IT–SOFC cathodes in terms of their thermal, electrical and electrochemical properties. Thermal expansion of the LnSFM was well compatible with that of Sm_0.2Ce_0.8O_1.9 (SDC) electrolyte. Both conductivity and electrochemical performances of the LnSFM followed the same sequence of La > Nd > Pr. For the LaSFM, NdSFM and PrSFM cathodes, peak conductivities reached 73, 63 and 59 S·cm^–1 at 650 °C; polarization resistances attained 0.211, 0.446 and 0.469 Ω·cm² at 700 °C; peak power densities of the LnSFM cells with 300–μm–thick SDC electrolyte achieved 269, 261 and 233 mW·cm^–2 at 700 °C without cell degradation for operating 100 h. By comprehensive comparison, the LaSFM is assessed as a preferred cobalt–free ceramic cathode for IT–SOFC.

通过溶胶-凝胶法制备了无钴钙钛矿Ln _0.5 Sr _0.5 Fe _0.9 Mo _0.1 O _3–δ（Ln =镧系元素； LnSFM）。即使在1300°C下烧结，样品（Ln = Sm和Gd）仍未获得纯菱形相。因此，就其热，电和电化学性能而言，只有LaSFM，PrSFM和NdSFM组合物被评定为IT-SOFC阴极。LnSFM的热膨胀与Sm _0.2 Ce _0.8 O _1.9完全兼容（SDC）电解质。LnSFM的电导率和电化学性能均遵循La> Nd> Pr的相同顺序。对于LaSFM，NdSFM和PrSFM阴极，在650°C时峰值电导率达到73、63和59 S·cm ^–1；700℃下的极化电阻分别为0.211、0.446和0.469Ω·cm ²。具有300–μm厚的SDC电解质的LnSFM电池的峰值功率密度在700°C时可达到269、261和233 mW·cm ^–2，并且在100 h内不会发生电池降解。通过全面比较，LaSFM被评估为IT–SOFC的首选无钴陶瓷阴极。