Interface Engineering V₂ O₅ Nanofibers for High-Energy and Durable Supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors are crucial for energy storage.
• Vanadium pentoxide nanofibers (V2O5-NF) show promise but require interface engineering for improved performance.
• Efficient charge transport is key to high-performance supercapacitors.

Purpose of the Study:

• To engineer the interface of V2O5-NF using oxygen vacancies (Vö) and polyaniline (PANI).
• To enhance charge transport kinetics for high-energy and durable supercapacitors.
• To investigate the role of local electric fields and porous coatings in supercapacitor performance.

Main Methods:

• One-step polymerization of PANI onto V2O5-NF to introduce Vö.
• Fabrication of Vö-V2O5/PANI nanocable electrodes.
• Characterization of electrode materials and electrochemical performance testing.

Main Results:

• The Vö-V2O5/PANI electrode exhibited a specific capacitance of 523 F g⁻¹.
• Supercapacitors demonstrated excellent cycling stability, retaining 110% capacitance after 20,000 cycles.
• Dual modifications synergistically enhanced charge transfer kinetics.

Conclusions:

• Local electric fields induced by Vö promote charge transport.
• Porous PANI coating provides an efficient charge transport pathway.
• This strategy offers a pathway for developing advanced electrode materials for next-generation energy storage systems.