Graphene fiber-based asymmetric micro-supercapacitors

Abstract

Fiber-based asymmetric micro-supercapacitor (F-<italic>asym</italic>-mSC) is assembled by core–sheath graphene fiber decorated by MnO₂as the positive electrode and graphene-carbon nanotubes hybrid fiber as the negative electrode. The F-<italic>asym</italic>-mSC shows the highest energy density (11.9 μWh cm⁻²) for fiber-based supercapacitors and paves the way to high energy density, wearable, and flexible electronic devices.