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Ni nanoparticles@Ni-Mo nitride nanorod arrays: a novel 3D-network hierarchical structure for high areal capacitance hybrid supercapacitors

Abstract

Because of the advanced nature of high power density, fast charge/discharge time, excellent cycling stability, and safety, supercapacitors have attracted intensive attention for large-scale applications. Nevertheless, one of the obstacles for its further development is the low energy density caused by sluggish redox reaction kinetics, low electroactive electrode materials, and/or high internal resistance. Here, we develop a facile and simple nitridation process to successfully synthesize hierarchical Ni nanoparticles decorated Ni0.2Mo0.8N nanorod arrays on nickel foam (Ni-Mo-N NRA/NF) from its NiMoO4 precursor, which delivers a high areal capacity of 2446 mC cm-2 at a current density of 2 mA cm-2 and shows outstanding cycling stability. The superior performance of the Ni-Mo-N NRA/NF can be ascribed to the metallic conductive nature of Ni-Mo nitride, fast surface redox reactions for electrolyte ions and electrode materials, and low contacted resistance between active materials and current collectors. Furthermore, a hybrid supercapacitor (HSC) is assembled by using Ni-Mo-N NRA/NF as positive electrode and reduced graphene oxide (RGO) as negative electrode. The optimized HSC exhibits excellent electrochemical performance with a high energy density of 40.9 W h kg-1 at a power density of 773 W kg-1 and retention of 80.1% specific capacitance after 6000 cycles. These results indicate that Ni-Mo-N NRA/NF have promising potential for high-performance supercapacitors.

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Publication details

The article was received on 28 Jul 2017, accepted on 11 Oct 2017 and first published on 12 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05560A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ni nanoparticles@Ni-Mo nitride nanorod arrays: a novel 3D-network hierarchical structure for high areal capacitance hybrid supercapacitors

    Y. Ruan, L. Lv, Z. Li, C. Wang and J. Jiang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05560A

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