Piezoelectric‐Field Coupling Strategy for Regulating Interfacial Charge Transfer Toward High‐Performance Rechargeable Zn–Air Batteries

Oxygen electrode reaction kinetics is crucial for achieving high‐energy‐density rechargeable Zn–air batteries. Herein, we couple mechanical energy with electrochemical processes by a piezoelectric BaTiO 3 /ZnIn 2 S 4 heterostructure to synergistically regulate interfacial oxygen reaction kinetics. Strain‐induced polarization in BaTiO 3 converts mechanical stimuli into interfacial potential differences, while ZnIn 2 S 4 provides abundant active sites, enabling Z‐scheme charge separation and amplified interfacial fields. As demonstrated theoretically and experimentally, piezoelectric polarization tuning modulates the electronic structure and adsorption energetics, thus lowering ORR/OER barriers. Benefit from piezoelectric‐field coupling strategy, rechargeable Zn–air batteries achieve a peak power density of 253.3 mW cm −2 (34.4% higher than without mechanical input) and an energy density of 890.8 mWh g −1 . This study establishes a piezoelectric‐field‐coupled paradigm for interfacial kinetic regulation for renewable‐energy‐driven and high‐efficiency energy storage systems.