Reduced graphene oxide composite fiber with hierarchical pores for all-solid-state fiber supercapacitors

In the burgeoning field of flexible energy storage, creating resilient and efficient supercapacitors suitable for integration into wearable technology remains a formidable challenge. This paper introduces the composite fiber supercapacitors (FSC) based on the reduced graphene oxide (rGO) and the scrolled reduced graphene oxide (SrGO), which feature hierarchical pore structures. The composite fiber includes micropores (<2 nm) and mesopores (2–50 nm), provided by the SrGO and rGO, respectively, thus indicating the structures with practical applicability to supercapacitors. This structural enhancement translates into exceptional electrochemical attributes, including increased specific capacitance and electrical conductivity, outperforming standard graphene-based fibers. Additionally, the performance stability of the composite fibers under mechanically dynamic conditions demonstrated their successful weaving into commercial fabrics.