Revitalizing Perovskite‐Based Oxygen Evolution Catalysts via High‐Entropy Engineering: Fundamentals, Advances, and Critical Challenges

ABSTRACT The development of efficient and stable oxygen evolution reaction (OER) electrocatalysts is crucial for advancing hydrogen production via water electrolysis. The evolution from conventional perovskites to high‐entropy perovskite materials (HEPMs) ingeniously overcomes the limitations of scarce active sites and poor stability, reinvigorating perovskites for OER catalysis. HEPMs, by introducing multiple principal elements into the perovskite lattice, ingeniously combine the structural flexibility of perovskites with the unique effects of high‐entropy materials, thus infusing new vitality into the catalytic application of perovskite materials in OER. This review systematically elucidates the physicochemical origins of the enhanced OER performance from perovskite materials to HEPMs, with a focus on their unique crystal and electronic structural characteristics, as well as the mechanisms of the four core effects. Subsequently, we also provide a critical summary of the main synthesis methods for HEPMs and evaluate their applicability and limitations. In addition, a comprehensive review of the applications of various HEPMs in the OER is conducted, with a focus on research progress in enhancing catalytic performance through strategies. Finally, this paper systematically outlines the challenges and future development directions of HEPMs in the field of OER catalysis, providing a forward‐looking perspective for the design of next‐generation high‐performance electrocatalysts.