Na‐Sm Bimetallic Regulation and Band Structure Engineering in CaBi₂Nb₂O₉ to Enhance Piezo‐photo‐catalytic Performance

The piezoelectric enhancement of photo-catalytic activity for water splitting and pollutant degradation is a novel approach to developing renewable energy environmental protection applications. Herein, new form defect engineered Na-Sm bimetallic-regulated CaBi2Nb2O9 platelet synthesized via molten salt process An intermediate band structure introduced by Sm-doping, empty orbitals in the conductive are Na-doping. These factors, combined with increased local charge density around Sm Na atoms, result an electrical conductivity, improved electron mobility, provide additional electrons enhancing catalytic reactions. As consequence, judicious co-doping leads unique synergetic piezo-photo-electric effect superior piezo-photo-catalytic performance H2 production (158.53 µmol g−1 h−1) (rate constant, k = 0.257 min−1). This provides important insights into application engineering exploit cooperative doping alkaline earth metals rare create high-performance catalysts.