Oxygen Deficient Perovskite as a Catalyst for Oxygen Evolution Reaction

Oxygen-deficient perovskites (ODPs) have recently emerged as promising catalysts for the oxygen evolution reaction (OER). The OER is a key reaction in water splitting, which is a clean and renewable method for hydrogen production. OER remains indispensable reaction for electrically rechargeable metal air batteries and solid oxide fuel cells. Similarly, hydrogen generated by water splitting is used for hydrogen fuel cells. Perovskites are a class of materials with a crystal structure, consisting of a cubic unit cell with a central cation surrounded by oxygen ions. Oxygen-deficient perovskites are a type of perovskite in which some of the oxygen ions are missing, leading to oxygen vacancies. These oxygen vacancies can create unique catalytic sites on the surface of the perovskite, which can promote the OER. Studies have shown that oxygen-deficient perovskites such as CaSrFe0.75Co0.75Mn0.5O6?? (CSFCM) and Ba0.5Sr0.5Co0.8Fe0.2O3-x exhibit high catalytic activity for the OER, with low overpotentials and high current densities. The oxygen vacancies on the surface of these materials can act as active sites for the dissociation of water molecules and the formation of oxygen gas. ODP hold great potential for the development of efficient and cost-effective catalysts for the OER.