The incorporation of expanded 1T-enriched MoS₂ boosts hybrid fiber improved charge storage capability

In order to enhance the charge storage capability of carbonaceous fibers for wearable supercapacitors, efforts have been devoted to the incorporation of transition metal dichalcogenides (e.g., MoS₂), nevertheless the improvement is moderate since the electrochemical properties of MoS₂ severely depend on their crystal phase and interlayer spacing. Herein, a facile space-confined hydrothermal method is developed to synthesize graphene fibers embedded with expanded 1T-enriched MoS₂ in a single-step. In such a fiber configuration, 1T phase enables MoS₂ hydrophilicity and high electrical conductivity while expanded interlayer spacing facilitates fast ion intercalation/de-intercalation. The hybrid fibers exhibit significantly enhanced volumetric specific capacitance (C_V) of 491.1 F cm⁻³ for single electrode and 44.6 F cm⁻³ for solid-state device, respectively, with good rate performance and excellent cycling stability.