Research progress on crystal structure regulation strategies for two-electron oxygen reduction of transition metal compounds

Currently, the electrocatalytic two-electron oxygen reduction reaction for the production of H₂O₂ presents a promising alternative to the energy-intensive anthraquinone process. Enhancing the selectivity and activity of the catalyst is crucial for achieving efficient electrosynthesis of H₂O₂. Transition metal compound catalysts are considered ideal electrocatalysts due to their advantages, including simple preparation, low cost, diverse crystal structures, abundant availability, environmental friendliness, and the synergistic effects between coupled metals. This paper systematically reviews the latest research advancements regarding transition metal compounds used in oxygen reduction reactions to generate H₂O₂. It begins by elaborating on the fundamental concepts related to oxygen reduction reactions and subsequently discusses various methods for regulating transition metal compound catalysts, including element doping, defect generation, heterogeneous structure construction, crystal design, and polycrystalline transformation. The activities, selectivity, and stability of different transition metal compounds in the electrocatalytic synthesis of H₂O₂ are summarized, and the future development directions for transition metal compound catalysts are explored, providing valuable insights for the large-scale and efficient electrosynthesis of H₂O₂ in the future.