Electrochemical capacitive properties of all-solid-state supercapacitors based on ternary MoS2/CNTs-MnO2 hybrids and ionic mixture electrolyte

Abstract All-solid-state supercapacitors constructed with effectively composited materials are required urgently for the next generation of portable electronic devices. Herein, two dimensions of materials (carbon nanotubes and exfoliated MoS 2 ) are used as basic building blocks for deposition of zero-dimensional birnessite-MnO 2 nanoparticles. The obtained ternary hybrids with open conducting nanoarchitecture can provide multiple accessible electroactive sites to minimize the ion-diffusion distances. In a three-electrode aqueous system, the MoS 2 /CNTs-MnO 2 exhibits high specific capacitance (365.6 F/g) and excellent rate capability (76.5% capacity retention at 8 A/g). The advantages of MoS 2 /CNTs-MnO 2 hybrids are evaluated by investigating symmetric and asymmetric supercapacitor using PVDF-HFP/EMIMBF 4 /EMIMTFSI gel electrolyte. The potential window of both symmetric and asymmetric supercapacitor can be enlarged to 4 V. In particular, the asymmetric device provides a maximum energy of 124 Wh/kg at a specific power of 916 kW/kg. It is prospected that such novel hybrids can offer potential promise in energy storage device applications.