Interfacial Constructing Flexible V₂O₅@Polypyrrole Core-Shell Nanowire Membrane with Superior Supercapacitive...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing advanced materials for energy storage is crucial.
• Flexible membranes with enhanced conductivity are needed for efficient electrochemical devices.
• Vanadium pentoxide (V₂O₅) and polypyrrole (PPy) are promising materials for energy storage applications.

Purpose of the Study:

• To prepare a flexible membrane of ultralong V₂O₅@conducting polypyrrole (V₂O₅@PPy) core-shell nanowires.
• To demonstrate the reactive template function of V₂O₅ in initiating polypyrrole polymerization.
• To evaluate the performance of the V₂O₅@PPy core-shell hybrid as a binder- and additive-free supercapacitor electrode.

Main Methods:

• Facile in situ interfacial synthesis approach for V₂O₅@PPy core-shell nanowires.
• Utilizing V₂O₅ as a reactive template for uniform and conformal polypyrrole nanocoating without additional oxidants.
• Fabrication of freestanding V₂O₅@PPy nanowire membranes.

Main Results:

• The V₂O₅@PPy core-shell hybrid membrane demonstrated enhanced electrochemical performance.
• Specific capacitance reached 334 F g^-1 with superior rate capability and improved cycling stability.
• The material's structure facilitated increased electrical conductivity, shortened ion/electron transport distance, and enlarged electrode/electrolyte contact area.

Conclusions:

• A simple and effective interfacial strategy for constructing V₂O₅/conducting polymers was developed.
• The V₂O₅@PPy core-shell hybrid shows significant potential for various energy-storage technologies.
• This approach offers a pathway for designing high-performance binder- and additive-free electrodes.