Covalent-architected molybdenum disulfide arrays on Ti3C2T MXene fiber towards robust capacitive energy storage

Ti3C2Tx MXene fiber has shown extraordinary potential for supercapacitor electrode in wearable electronics and textile energy storage, but realizing high energy density and practical-powered applications remains a great challenge. Here, we report a covalent-architected molybdenum disulfide-Ti3C2Tx (MoS2-Ti3C2Tx) core-shell fiber for high-performance supercapacitor. Benefiting from the microfluidic and micro-reaction strategies, the ordered MoS2 arrays are strongly bridged on Ti3C2Tx fiber via Ti-O-Mo bond, resulting in large exposed surface, enhanced porosity and excellent interfacial conduction for charges high diffusion and faradaic transfer. The MoS2-Ti3C2Tx fiber exhibits ultra-large capacitance of 2028 F cm−3 and admirable reversibility in 1 M H2SO4 aqueous electrolyte. Meanwhile, MoS2-Ti3C2Tx fiber-based solid-state supercapacitor presents high energy density of 23.86 mWh cm−3, capacitance of 1073.6 F cm−3 and superior cycling ability of 92.13% retention after 20,000 cycles, which can realize stable energy supply for wearable watch, LEDs, electric fans, toy ship and self-powered devices. Our work may provide an insightful guidance for the advanced design of structural fiber towards robust new energy and next-generation wearable industry.