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This study characterizes BaCo_0.7Fe_0.2Nb_0.1O_3−δ (BCFN) perovskite oxide and evaluates it as a potential cathode material for proton-conducting SOFCs with a BaZr_0.1Ce_0.7Y_0.2O_3-δ (BZCY) electrolyte. A four-probe DC conductivity measurement demonstrated that BCFN has a modest electrical conductivity of 2–15 S cm⁻¹ in air with p-type semiconducting behavior. An electrical conductivity relaxation test showed that BCFN has higher D_chem and K_chem than the well-known Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃₋δ oxide. In addition, it has relatively low thermal expansion coefficients (TECs) with values of 18.2 × 10⁻⁶ K⁻¹ and 14.4 × 10⁻⁶ K⁻¹ at temperature ranges of 30–900 °C and 30–500 °C, respectively. The phase reaction between BCFN and BZCY was investigated using powder and pellet reactions. EDX and XRD characterizations demonstrated that BCFN had lower reactivity with the BZCY electrolyte than …