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

摘要

This paper reports the first nickel hydroxide-manganese dioxide—reduced graphene oxide (Ni(OH)2 MnCyRGO) ternary hybrid sphere powders as supercapacitor electrode materials. Due to the abundant porous nanostruc-ture, 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-MnC2-RGO ternary hybrid spheres as active materials exhibited significantly enhanced specific capacitance (1985 F-g~(-1)i) and energy density (54.0 Wh-kg~(-1)), based on the total mass of active materials. In addition, the Ni(OH)2-MnCyRGO hybrid spheres-based asymmetric supercapacitor also showed satisfying energy density and electrochemical cycling stability.