Vacancy effect on the electrocatalytic activity of LaMn 1/2 Co 1/2 O 3- δ for hydrogen and oxygen evolution reactions.

Development of efficient electrocatalysts for water splitting can be a significant step toward green hydrogen generation. In this work, a remarkable enhancement of electrocatalytic properties is achieved through the incorporation of oxygen-vacancies in a perovskite oxide, while maintaining the same structural framework. The oxygen-deficient material La 2 MnCoO 6- δ (LaMn 0.5 Co 0.5 O 3- δ ) is isostructural to the parent stoichiometric material, but shows drastically enhanced electrocatalytic properties for both half-reactions of water-splitting, namely hydrogen-evolution and oxygen-evolution reactions, due to the oxygen-vacancies.