Flexible nickel disulfide nanoparticles-anchored carbon nanofiber hybrid mat as a flexible binder-free cathode for solid-state asymmetric supercapacitors

Nickel disulfide nanoparticles (NiS(2)NPs)-anchored carbon nanofibers (NiS(2)NPs@CNF) hybrid mats were fabricated via the sequential process of stabilization and carbonization of electrospun polyacrylonitrile-based fibers followed by hydrothermal growth of NiS(2)NPs on the porous surface of CNFs. The vertical growth of NiS(2)NPs on entire surfaces of porous CNFs appeared in the SEM images of hybrid mat. The hierarchical NiS(2)NPs@CNF core-shell hybrid nanofibers with 3D interconnected network architecture can endow continuous channels for easy and rapid ionic diffusion to access the electroactive NiS(2)NPs. The conductive and interconnected CNF core could facilitate electron transfer to the NiS2 shell. Moreover, the porous CNF as a buffering matrix can resist volumetric deformation during the long-term charge-discharge process. The NiS(2)NPs@CNF electrode can yield high specific capacitance (916.3 F g(-1) at 0.5 A g(-1)) and reveal excellent cycling performances. The solid-state asymmetric supercapacitor (ASC) was fabricated with NiS(2)NPs@CNF mat as a binder-free positive electrode and activated carbon cloth as a negative electrode. As-assembled ASC not only produce high specific capacitance (364.8 F g(-1) at 0.5 A g(-1)) but also exhibit excellent cycling stability (similar to 92.8% after 5000 cycles). The ASC delivered a remarkably high energy density of 129.7 Wh kg(-1) at a power density of 610 W kg(-1). These encouraging results could make this NiS(2)NPs@CNF hybrid mat a good choice of cathode material for the fabrication of flexible solid-state ASC for various flexible/wearable electronics.