Plasma‐Engineered LaMO 3 Perovskites as Catalysts for the Oxygen Evolution Reaction: Unlocking Potential by Oxygen Vacancy Modification

ABSTRACT The development of efficient and cost‐effective electrocatalysts for the oxygen evolution reaction (OER) is crucial for advancing green hydrogen production via water electrolysis. While perovskite oxides represent promising non‐noble metal catalysts, their OER performance is often limited by poor conductivity and insufficient active site exposure. In this work, we report a rapid and versatile plasma engineering strategy to significantly enhance the OER activity of perovskite oxides LaMO 3 (M = Fe, Co, Ni). The modified catalyst (V‐LaFeO 3 ) exhibits increased specific surface area, abundant oxygen vacancies, and improved charge transfer capability. As a result, V‐LaFeO 3 achieves a low overpotential of 332 mV at a current density of 10 mA cm − 2 , outperforming both pristine LaFeO 3 and commercial RuO 2 . The universality of this approach is further demonstrated with LaCoO 3 and LaNiO 3 oxides, which also show enhanced OER performance after plasma treatment. This study highlights plasma engineering as a general and efficient strategy for designing high‐performance perovskite‐based electrocatalysts for sustainable energy applications.