Interfacial-Engineered NiZn-MOF@MXene Core-shell Heterostructure for High-Performance Asymmetric Supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing efficient energy storage devices with high energy density, rapid charge transport, and long-term stability is crucial for next-generation electronics.
• Metal-organic frameworks (MOFs) and MXenes show promise for energy storage but face challenges like limited conductivity and restacking.

Purpose of the Study:

• To synthesize and investigate a hierarchical NiZn-MOF@MXene core-shell heterostructure as an electrode material for high-performance asymmetric supercapacitors.
• To leverage the synergistic properties of bimetallic MOFs and conductive MXene for enhanced electrochemical performance.

Main Methods:

• A facile hydrothermal strategy was employed to synthesize the NiZn-MOF@MXene core-shell heterostructure.
• The material was characterized and tested as an electrode in a three-electrode configuration and in an asymmetric supercapacitor device (NiZn-MOF@MXene//activated carbon).

Main Results:

• The NiZn-MOF@MXene electrode exhibited a high specific capacitance of 1827 F/g at 1 A/g and 92.4% capacitance retention after 10,000 cycles.
• The asymmetric supercapacitor achieved an energy density of 84.9 Wh/kg at 3200 W/kg with 90.5% capacitance retention after 10,000 cycles.
• The core-shell structure effectively prevented MXene restacking and facilitated rapid charge transport and ion diffusion.

Conclusions:

• The hierarchical NiZn-MOF@MXene core-shell heterostructure demonstrates superior performance for high-performance asymmetric supercapacitors.
• The synergistic interaction between Ni/Zn redox centers and the MXene framework enhances charge-transfer kinetics and structural stability.
• This study presents an effective strategy for designing advanced MOF-MXene hybrid electrodes for next-generation energy storage systems.