Hierarchical MXene/ACF/Ni-MOF ternary composites: Rational design and enhanced supercapacitive performance.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing advanced electrode materials is crucial for high-performance energy storage devices.
• MXene-based composites offer unique properties for electrochemical applications.

Purpose of the Study:

• To synthesize and characterize novel MXene/ACF/Ni3(HITP)2 composite nanomaterials.
• To evaluate their potential as electrode materials for supercapacitors.

Main Methods:

• Synthesis of 3D composite nanomaterials using MXene nanosheets and acidified activated carbon fiber (ACF).
• Characterization of structural, morphological, and electrochemical properties.
• Fabrication and testing of symmetric supercapacitor devices.

Main Results:

• MXene/ACF/Ni3(HITP)2 composites showed enhanced specific surface area and active sites compared to ACF/Ni3(HITP)2.
• Achieved a specific capacity of 159.6 F g-1 at 0.5 A g-1, outperforming ACF/Ni3(HITP)2 (125 F g-1).
• Supercapacitor devices demonstrated a specific capacitance of 41.2 F g-1 at 0.5 A g-1 with over 93.8% capacitance retention after 5000 cycles at 3 A g-1.

Conclusions:

• The 3D MXene/ACF/Ni3(HITP)2 composite structure facilitates rapid ion transfer and electron transport.
• These composites exhibit superior electrochemical activity and stability for supercapacitor applications.
• The synthesis strategy provides a pathway for constructing high-performance electrode materials.