Graphene fiber-based asymmetric micro-supercapacitors

Fiber-based asymmetric micro-supercapacitor (F- asym -mSC) is assembled by core–sheath graphene fiber decorated by MnO ₂ as the positive electrode and graphene-carbon nanotubes hybrid fiber as the negative electrode. The F- asym -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.