Biomass modified carbon nanofibers use for flexible supercapacitor electrodes with thermal conductive performances

The advancement of flexible electrode with excellent energy storage is essential for supercapacitors. Herein, a porous biomass-doped carbon nanofiber@bimetallic oxide composite (B-CNF@NiO/Co₃O₄) has been prepared as a binder-free flexible electrode. The heteroatoms form biomass not only offer pseudocapacitance but also a multitude of active sites for the grow of bimetallic oxides. The well-grown B-CNF@NiO/Co₃O₄ shows a high specific capacitance (629.5 F g⁻¹) and the asymmetric flexible supercapacitor (ASC) has an energy density of 31.5 Wh kg⁻¹ at a power density of 757.4 W kg⁻¹. The properties of bimetallic oxides and 3D networks facilitate transportation of interlayer ion, providing a straightforward approach to fabricate non-adhesive flexible electrode with dual functionalities of energy storage. In addition, the thermal conductive experiment demonstrated a favorable thermal conductivity (TC) of 1.06 W m⁻¹ K⁻¹.