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High-Performance Microsupercapacitors Based on Bioinspired Graphene Microfibers.

Hui Pan, Dawei Wang1, Qingfa Peng2

  • 1School of Chemical Engineering , UNSW , Sydney , New South Wales 2052 , Australia.

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Researchers developed a biomimetic method using microfluidics to create oriented graphene microfibers for advanced microsupercapacitors. This innovation achieves high energy and power density for flexible, on-chip energy storage solutions.

Keywords:
biomimetric fabricationflexiblemicrofibermicrosupercapacitoron-chip

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Storage

Background:

  • Miniaturization of portable electronics drives demand for advanced energy storage solutions like microsupercapacitors.
  • Achieving high energy density without compromising power density in microsupercapacitors remains a significant challenge.
  • Existing fabrication methods like printing and lithography face limitations in optimizing performance.

Purpose of the Study:

  • To develop a novel fabrication protocol for high-performance microsupercapacitors.
  • To create highly oriented graphene-based composite microfibers for enhanced energy storage.
  • To demonstrate flexible and on-chip asymmetric microsupercapacitors with superior energy and power densities.

Main Methods:

  • A biomimetic approach mimicking spider silk spinning using a microfluidic chip.
  • Fabrication of highly oriented graphene-based composite microfibers.
  • In-plane patterning of microfibers to create asymmetric microsupercapacitors.
  • Utilizing nanocarbons and molybdenum disulfide for energy density enhancement.

Main Results:

  • Achieved high electrical conductivity (∼3 × 10⁴ S m⁻¹) in oriented microfibers, enabling high power density.
  • Developed on-chip microsupercapacitors with a pattern resolution of 100 μm.
  • Demonstrated an energy density of 10⁻² W h cm⁻³ and an ultrahigh power density exceeding 100 W cm⁻³ in aqueous electrolyte.
  • Successfully fabricated flexible and on-chip asymmetric microsupercapacitors.

Conclusions:

  • The biomimetic microfluidic fabrication offers a new pathway for designing high-performance microsupercapacitors.
  • The oriented graphene microfibers provide a robust platform for flexible and on-chip energy storage.
  • This approach holds potential for advancing energy storage in microelectronic devices and beyond.