A facile method to synthesise reduced graphene oxide/carbon nanotube hybrid fibers as binder-free electrodes for supercapacitors

•Fabrication and structure design of G/CNTs hybrid fibers.•The controllable synthesis processes lead to ordered and porous structure.•The designed structure is beneficial for flexibility and electrochemical properties.•The hybrid fibers show high specific capacitance and stable cycle performance.

The reduced graphene oxide/carbon nanotube hybrid fibers (G/CNTs) were prepared by a facile chemical reduction and self-assembly strategy at low temperature. SEM images indicate a certain degree of reduced graphene oxide nanosheets and carbon nanotube orientation along the main axis of the obtained hybrid fibers. The reduced graphene oxide/carbon nanotube hybrid fibers exhibit large surface area of 149.85 m2 g−1 and good mechanical strength. The electrochemical performances of hybrid fibers as flexible and binder-free electrodes are evaluated by using a three-electrode system, and it displays high specific capacitance of 243.0 Fg−1 at a current density of 200 mA g−1, which is mainly ascribed to porous structure and large specific surface area. The as-synthesized reduced graphene oxide/carbon nanotube hybrid fibers will be potential candidate for flexible and binder-free electrodes for supercapacitors.