A bifunctional perovskite catalyst for oxygen reduction and evolution

Abstract

La0.3(Ba0.5Sr0.5)0.7Co 0.8Fe0.2O3-δ is a promising bifunctional perovskite catalyst for the oxygen reduction reaction and the oxygen evolution reaction. This catalyst has circa 10 nm-scale rhombohedral LaCoO3 cobaltite particles distributed on the surface. The dynamic microstructure phenomena are attributed to the charge imbalance from the replacement of A-site cations with La3+ and local stress on Co-site sub-lattice with the cubic perovskite structure. The perovskite La0.3(Ba 0.5Sr0.5)0.7Co0.8Fe 0.2O3-δ (La0.3-5582) is introduced as a bifunctional catalyst to compete with precious-metal-based catalysts. The newly introduced perovskite bears rhombohedral phase LaCoO3-δ particles on the surface of the grains.