1 research outputs found
High-Performance Microsupercapacitors Based on Bioinspired Graphene Microfibers
The
miniaturization of portable electronic devices has fueled the development
of microsupercapacitors that hold great potential to complement or
even replace microbatteries and electrolytic capacitors. In spite
of recent developments taking advantage of printing and lithography,
it remains a great challenge to attain a high energy density without
sacrificing the power density. Herein, a new protocol mimicking the
spider’s spinning process is developed to create highly oriented
microfibers from graphene-based composites via a purpose-designed
microfluidic chip. The orientation provides the microfibers with an
electrical conductivity of ∼3 × 10<sup>4</sup> S m<sup>–1</sup>, which leads to a high power density; the energy
density is sustained by nanocarbons and high-purity metallic molybdenum
disulfide. The microfibers are patterned in-plane to fabricate asymmetric
microsupercapacitors for flexible and on-chip energy storage. The
on-chip microsupercapacitor with a high pattern resolution of 100
μm delivers energy density up to the order of 10<sup>–2</sup> W h cm<sup>–3</sup> and retains an ultrahigh power density
exceeding 100 W cm<sup>–3</sup> in an aqueous electrolyte.
This work provides new design of flexible and on-chip asymmetric microsupercapacitors
based on microfibers. The unique biomimetic microfluidic fabrication
of graphene microfibers for energy storage may also stimulate thinking
of the bionic design in many other fields