Simultaneous synthesis of NiO/reduced graphene oxide composites by ball milling using bulk Ni and graphite oxide for supercapacitor applications

초록

Straightforward and scalable fabrications of energy storage electrode materials with high electrochemical performance are of great interest for applications in batteries and supercapacitors. Herein, we report a one-step process for producing high-performance NiO/reduced graphene oxide (RGO) nanocomposites using a ball mill based method, which is simple, environmentally friendly, and cost-effective. Graphite oxide (GO) and nickel power were pulverized in a ball mill, to produce NiO/RGO nanocomposites. GO played an important role in promoting a redox reaction between GO and metallic nickel, which produced a strong bond between the as-formed Ni oxide and RGO. The electrochemical performances of NiO/RGO were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge measurement, and impedance spectroscopy. The NiO/RGO electrodes exhibited high specific capacitance (590 F g(-1) at 1 A g(-1)), a high rate capability (88% retention at a high rate of 15 A g(-1)), and an excellent cycling stability (100% retention after 1000 charge/discharge cycles). (C) 2017 Elsevier B.V. All rights reserved.

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