Polarization Resistances of $(Ln1−xSrx)CoO3$ (⁠$Ln=Pr$⁠, Nd, Sm, and Gd $x=0$⁠, 0.3, 0.5, 0.7, and 1) as Cathode Materials for Intermediate Temperature-operating Solid Oxide Fuel Cells

This study focuses on cathode performances of $(Ln1−xSrx)CoO3−δ$ (⁠$Ln=Pr$⁠, Nd, Sm, and Gd, $x=0$⁠, 0.3, 0.5, 0.7, and 1) for intermediate temperature-operating solid oxide fuel cells (IT-SOFCs, $600–800°C$⁠). $(Ln1−xSrx)CoO3−δ$ powders as cathode materials for IT-SOFC, which can be operated between $600°C$ and $800°C$ were synthesized by the glycine-nitrate-process (GNP) method. The impedance spectroscopy method was used to investigate area specific resistance (ASR) and electrochemical properties of $(Ln1−xSrx)CoO3−δ$ (⁠$Ln=Pr$⁠, Nd, Sm, and Gd, $x=0$⁠, 0.3, 0.5, 0.7, and 1). $Pr0.5Sr0.5CoO3−δ$ and $Pr0.3Sr0.7CoO3−δ$ showed to $0.15Ωcm2$ of ASR at $700°C$ and $Nd0.5Sr0.5CoO3−δ$ to $0.14Ωcm2$ at $700°C$⁠. $Sm0.5Sr0.5CoO3−δ$ showed the lowest ASR values of $0.10Ωcm2$ on 10% Gd-doped cerium oxide at $700°C$⁠.