Atomic-Scale Imaging of Built-In Electric Field Reveals Fe–O v Synergistic Enhancement for Oxygen Evolution Reaction

synergistic effect to achieve long-term stability and high catalytic activity in the anodic oxygen evolution reaction (OER). We anticipate this work can elucidate the interplay between cation-anion coregulation and the built-in electric field, offering a rational design strategy for high-performance OER electrocatalysts.