VO₂(B) nanobelts/reduced graphene oxide composites for high-performance flexible all-solid-state supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Vanadium oxide is promising for electrochemical capacitors but suffers from poor conductivity and stability.
• These limitations lead to significant capacitance loss during device operation.

Purpose of the Study:

• To fabricate a free-standing vanadium dioxide nanobelts/reduced graphene oxide composite film for enhanced supercapacitor performance.
• To investigate the structural and electrochemical properties of the VO2(B)/rGO composite for energy storage applications.

Main Methods:

• Fabrication of a composite film by assembling VO2(B) nanobelts and reduced graphene oxide (rGO).
• Characterization of the composite's porous framework and electrochemical performance in supercapacitors.
• Assembly and testing of an all-solid-state symmetrical supercapacitor using the VO2/rGO composite.

Main Results:

• The VO2/rGO composite film exhibited a specific capacitance of 353 F g−1 at 1 A g−1.
• The porous structure and enhanced conductivity resulted in 80% capacitance retention after 500 cycles.
• The all-solid-state supercapacitor achieved a maximum voltage of 1.6 V and a high power density of 7152 W kg−1.
• Excellent cycling stability was demonstrated with 78% capacitance retention after 10,000 cycles at 10 A g−1.

Conclusions:

• The VO2(B)/rGO composite effectively enhances conductivity and ion transport for superior supercapacitor performance.
• The developed material offers a promising solution for high-performance and stable energy storage devices.
• The composite demonstrates potential for advanced applications requiring high power density and long cycle life.