Highly efficient electrocatalysts for oxygen reduction reaction

Highly efficient and chemically compatible LnxSr1−xCoO3−δ (Ln = La, Sm, Gd, …)/Co3O4 electrocatalysts for oxygen reduction reaction are presented and the very low cathode polarization resistances and excellent performances implied their promising application for developing intermediate-temperature solid oxide fuel cells (SOFCs), as well as potential application for oxygen separation membranes.