Interfacial‐Engineered NiZn‐MOF@MXene Core–shell Heterostructure for High‐Performance Asymmetric Supercapacitors

ABSTRACT The development of efficient energy storage devices simultaneously delivering high energy density, rapid charge transport, and long‐term stability remains a major challenge for next‐generation electronics. Herein, a hierarchical NiZn‐MOF@MXene core–shell heterostructure is synthesized through a facile hydrothermal strategy and explored as an electrode material for high‐performance asymmetric supercapacitors. The integration of redox‐active bimetallic NiZn metal‐organic framework (MOF) with conductive Ti ₃ C ₂ T _x MXene nanosheets provides abundant electroactive sites while facilitating rapid electron transport and efficient ion diffusion. The core–shell architecture effectively suppresses the restacking of MXene layers and exposes abundant electrochemically active sites. As a result, the electrode delivers a high specific capacitance of 1827 F/g at 1 A/g and excellent cycling stability with 92.4% retention after 10000 cycles in a three‐electrode configuration. The assembled NiZn‐MOF@MXene//activated carbon asymmetric supercapacitor operates within a voltage window of 1.6 V, achieving an energy density of 84.9 Wh/kg at a power density of 3200 W/kg, while maintaining 90.5% capacitance retention after 10000 cycles. The superior performance arises from the synergistic interaction between Ni/Zn redox centers and the conductive MXene framework, which improves charge‐transfer kinetics and structural stability. These results highlight an effective strategy for designing advanced MOF‐MXene hybrid electrodes for next‐generation high‐performance energy storage systems.