Turing‐Type Medium‐Entropy Perovskite Fluorides Enable Superior Water Oxidation via Dual‐Path Dynamic Coupling Mechanism

Abstract Turing structure, serving as a classical model of reaction‐diffusion system, has gradually emerged in the field of biology and chemistry. Nevertheless, achieving precise control over diffusion and chemical potential gradients under non‐thermodynamic equilibrium state to induce a Turing pattern remains a fundamental challenge. Here, the ingenious incorporation of inhibitor (Mn) constructs a new localized short‐range order, serving as the “chemical seed” for the spontaneous formation of Turing configuration in K(FeCoNiMn)F 3 medium‐entropy perovskite fluorides (MEPFs). Meanwhile, the lattice distortion stemming from the local Jahn–Teller effect disrupts the symmetry of the coordination environment, which is conducive to the fluorine‐oxygen exchange in the pre‐catalytic stage. Further in situ spectroscopy and density functional theory reveal that the enhanced 3d‐2p orbital hybridization and the weakened metal‐oxygen bond simultaneously activate the lattice oxygen while lowering the energy barrier for lattice oxygen desorption. Based on this, the lattice oxygen mechanism‐dominated dual‐path coupling mechanism enables superior performance of oxygen evolution reaction, reaching 100 mA cm −2 with an impressively low overpotential of 201 mV.