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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Supercapacitors are crucial for energy storage.
  • Graphene-based materials offer excellent electrical properties.
  • Developing flexible and high-performance supercapacitors is an ongoing challenge.

Purpose of the Study:

  • To fabricate a novel all graphene coaxial fiber supercapacitor (GCS).
  • To evaluate the electrochemical performance of the fabricated GCS.
  • To investigate the potential for enhancing energy density using different electrolytes.

Main Methods:

  • Fabrication of a GCS using wet-spinning for the core and dip-coating for the sheath.
  • Characterization of the GCS's structural, mechanical, and electrochemical properties.
  • Testing the supercapacitor performance with different electrolytes, including an organic ion liquid.

Main Results:

  • The GCS demonstrated flexibility, lightweight nature, and high strength.
  • Achieved a specific capacitance of 205 mF cm⁻² (182 F g⁻¹) and energy density of 17.5 μW h cm⁻² (15.5 W h kg⁻¹).
  • Utilizing an organic ion liquid electrolyte further boosted the energy density to 104 μW h cm⁻².

Conclusions:

  • The developed GCS is a promising candidate for flexible energy storage.
  • The fabrication method allows for scalable production of high-performance supercapacitors.
  • Further optimization with advanced electrolytes can significantly enhance energy storage capabilities.