Porous Nickel Hydroxide Manganese Dioxide-Reduced Graphene Oxide Ternary Hybrid Spheres as Excellent Supercapacitor Electrode Materials

This paper reports the first nickel hydroxide-manganese dioxide-reduced graphene oxide (Ni(OH)(2)-MnO2-RGO) ternary hybrid sphere powders as supercapacitor electrode materials. Due to the abundant porous nanostructure, relatively high specific surface area, well-defined spherical morphology, and the synergetic effect of Ni(OH)(2), MnO2, and RGO, the electrodes with the as-obtained Ni(OH)(2)-MnO2-RGO ternary hybrid spheres as active materials exhibited significantly enhanced specific capacitance (1985 F.g(-1)) and energy density (54.0 Wh.kg(-1)), based on the total mass of active materials. In addition, the Ni(OH)(2)-MnO2-RGO hybrid spheres-based asymmetric supercapacitor also showed satisfying energy density and electrochemical cycling stability.