High‐Entropy‐Tailored d‐p Orbital Hybridization for Enhanced Oxygen Reduction Reaction in Perovskite Air Electrodes of Solid Oxide Fuel Cells

tolerance and structural stability of PNBSCC. Combined X-ray absorption spectroscopy and density functional theory calculations reveal weakened Co 3d-O 2p hybridization and reduced Co─O covalency in PNBSCC, which favors lattice-oxygen activation and oxygen-vacancy formation. The increased oxygen-vacancy population facilitates oxygen-ion transport, thereby accelerating ORR kinetics and improving cell performance.