Defect Engineering of Brownmillerites for Oxygen Evolution and Reduction Electrocatalysis
The slow kinetics of the oxygen evolution (OER) and reduction (ORR) reactions, combined with the high costs of noble metals, remain major barriers to a sustainable hydrogen economy. Earth-abundant brownmillerite-type oxides (A2B2O5) offer a promising alternative, yet their catalytic mechanism is frequently misunderst...