Cation‐Vacancy Induced Compressive Strain Localization in RuO 2 Catalyst for High‐Performance Acidic Oxygen Evolution

), thereby demonstrating significant energy efficiency. Multiscale analyses confirm that compressive strain stabilizes high-valence Ru sites through enhanced orbital overlap, reconciling catalytic activity with structural durability. This work establishes vacancy-driven strain engineering as a universal approach for designing robust, Ir-free OER electrocatalysts.