Engineering of multiscale periodic macroporous NaTaO3: Decoupling mass transport and charge dynamics for enhanced hydrogen evolution

High mass transfer efficiency, abundant surface sites, and short carrier migration distance can effectively enhance the photocatalytic performance of the materials. This study innovatively constructs a multiscale periodic macroporous (MPM) structure in the ternary metal oxide NaTaO 3 . The MPM architecture overcomes the inherent limitations of single-pore-size materials: large macropores suffer from thick pore walls leading to prolonged charge migration pathways and enhanced recombination, and low specific surface area, while small macropores lack efficient mass transport despite abundant active sites, and exhibit low electron-hole recombination. By synergistically integrating the advantages of both pore sizes, the MPM structure optimizes mass transport kinetics and charge separation efficiency, rendering it well-suited for solid-liquid phase photocatalytic reactions. Consequently, the photocatalytic hydrogen evolution activity of MPM NaTaO 3 is significantly enhanced, thereby establishing a novel strategy for the controlled synthesis of complex ternary metal oxides.