• • Specific capacity of 304.1 mAh g−1 at 5.0 A g−1 exceeds conventional V2O5 (≈250–300 mAh g−1) and MnO2 (≈200–300 mAh g−1) cathodes, enabling higher energy density per unit mass in grid-scale ZIB packs.
• • Capacity retention of 92.3% after 2000 cycles at 5.0 A g−1 corresponds to a degradation rate of 0.00385% per cycle, substantially lower than typical MOF-derived vanadium oxides (0.01–0.02% per cycle), reducing replacement frequency and lifetime cost.
• • Ultrahigh specific surface area of 1162.5 m2 g−1 provides abundant electroactive sites for electric double-layer capacitance, boosting rate capability and interfacial charge transfer kinetics.
• • Hierarchical porosity enables hybrid battery-supercapacitor storage, merging high energy density of Zn2+ insertion with high power density of capacitive adsorption, suitable for grid frequency regulation and peak shaving.