Bionic Bone Structure Anode Material of High-Capacity 3D Porous Vanadium Nitride@Carbon Nanocomposite via Spray Phase...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Vanadium nitride (VN) shows promise for supercapacitors but suffers from poor cycle life and rate performance.
• Designing composite structures is crucial to leverage VN's electrochemical properties effectively.
• Existing supercapacitor materials face challenges in balancing energy density and long-term stability.

Purpose of the Study:

• To create a novel porous carbon composite embedded with vanadium nitride nanoparticles.
• To investigate the electrochemical performance of these composites as supercapacitor anode materials.
• To address the limitations of pure vanadium nitride in supercapacitor applications.

Main Methods:

• Synthesis of porous carbon composites with embedded vanadium nitride nanoparticles.
• Utilized a spray phase-inversion strategy for composite fabrication.
• Characterized the mesh-like structure and evaluated electrochemical performance in a 6 M KOH electrolyte.

Main Results:

• Achieved a specific capacity of 431.5 F g^-1 at 0.5 A g^-1.
• Demonstrated excellent capacity retention of 78.7% after 5000 cycles.
• The porous carbon skeleton facilitated efficient electron and ion transfer, while VN nanoparticles enhanced capacity.

Conclusions:

• The developed porous carbon-vanadium nitride composites exhibit superior electrochemical performance for supercapacitor anodes.
• The unique mesh structure effectively confines vanadium nitride nanoparticles and enhances ion/electron transport.
• These versatile composites hold significant potential for various energy conversion and storage systems.