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

Abstract

• Use microfluidic and micro-reaction strategy to fabricate MoS 2 -Ti 3 C 2 T x fibers. • The vertically-aligned MoS 2 can provide abundant diffusion paths for ion storage. • The covalent engineering can facilitate rapidly interfacial electron conduction. • The MoS 2 -Ti 3 C 2 T x fiber has high energy density and superior durability. • The as-prepared F-SC can realize stable energy supply for wearable electronics. Ti 3 C 2 T x 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-Ti 3 C 2 T x (MoS 2 -Ti 3 C 2 T x ) core-shell fiber for high-performance supercapacitor. Benefiting from the microfluidic and micro-reaction strategies, the ordered MoS 2 arrays are strongly bridged on Ti 3 C 2 T x 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 MoS 2 -Ti 3 C 2 T x fiber exhibits ultra-large capacitance of 2028 F cm −3 and admirable reversibility in 1 M H 2 SO 4 aqueous electrolyte. Meanwhile, MoS 2 -Ti 3 C 2 T x 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 20000 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.