Synthesis of binder-free and highly conducting MoS2 sphere like electrode material for supercapacitor application

Abstract

Binder free spheres like molybdenum disulfide (MoS2) electrode material (E-M) is synthesized on nickel foam by chemical vapor deposition technique. The interconnected spheres like structures are responsible for maximum electrolyte-ions diffusion and control volume-expansion of MoS2 E-M. The synthesized sphere-based MoS2 E-M is exhibited specific capacitance of 4200 F/g, energy density and power density of 53–145 Wh/kg and 250–3000 W/kg. The absence of charge transfer resistance and binder free synthesis persuaded the MoS2 E-M to reveal the excellent cyclic stability of 98.76 % even after 4000 cycles. The equivalent series resistance before/after 4000 cycles of MoS2 E-M are −3.54/3.22 Ω. The constant b values are 0.721, 0.759, 0.768 and 0.771 which are greater than 0.5 but less than 1 indicating the hybrid-nature of the synthesied E-M. The diffusive and capacitive contributions are 96,78 and 4, 12 % at 5 and 200 mV/s.. The hybrid-nature of the MoS2 E-M makes it usable for the next-generation electrochemical energy storage devices.