Sm0.5Sr0.5CoO3−δ-infiltrated cathodes for solid oxide fuel cells with improved oxygen reduction activity and stability

► Sm0.2Ce0.8O1.9 (SDC) was preferred as a porous scaffold for the infiltration. ► A pure Sm0.5Sr0.5CoO3−δ (SSC) phase was formed with glycine as a complexing agent. ► Electrical conductivities of ∼15 S cm−1 were achieved with 20 wt% SSC + 80 wt% SDC. ► A stable performance was obtained with a 20 wt% SSC + 80 wt% SDC electrode. ► A 20 wt% SSC + 80 wt% SDC electrode showed a resistance of 0.05 Ω cm2 at 700 °C.