Abstract
A hybrid of zinc/nickel oxide nanoparticles supported on nitrogen doped three-dimensional graphene networks (ZnO/NiO/3DNG) have been designed through a simple microwave process assisted tube furnace thermal treatment. Well dispersed coupled zinc/nickel oxides nanoparticles with sizes of 10–20 nm are homogeneously anchored on 3DNG hybrid structure. As electrode active material of supercapacitors, the ZnO/NiO/3DNG nanocomposites exhibits an ultrahigh specific capacitance of 1839.4 F g−1 at a current density of l A g−1 in 6.0 M KOH solution, the EIS analysis of the electrode after 6000th cycle at 10 A g−1 remained about 93%, displayed that the fitting values of inner resistance and faradic charge transfer resistance of the electrode are low and electrode activity don’t change too much after cycling. Furthermore, the ZnO/NiO/3DNG composites exhibits the maximum energy density of 35.32 Wh kg−1 with the power density 139.72 W kg−1 at high current density of 10 A g−1 in the two-electrode system. The outstanding performance originates from the flexible three dimensional N-doped unique structural, which play important roles in stabilizing ZnO and NiO.
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Acknowledgements
This work was supported by China Postdoctoral Science Foundation (2017M621656), Research Foundation for Talented Scholars of Jiangsu University (14JDG187) and Jiangsu Planned Projects for Postdoctoral Research Funds (1701170C).
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Zhang, M., Ma, T., Wang, Y. et al. Microwave synthesis of three dimensional N-doped graphene self-supporting networks coated with Zinc/Nickel oxide nanocrystals for supercapacitor electrode applications. J Mater Sci: Mater Electron 29, 6991–7001 (2018). https://doi.org/10.1007/s10854-018-8686-z
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DOI: https://doi.org/10.1007/s10854-018-8686-z