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Synthesis of hierarchical porous CuO Nanowire@NiCo-layered double hydroxide core-shell structured nanoarrays on copper foam for high-performance supercapacitors

Abstract

In this work, a facile potentiostatic deposition technique was used to fabricate a three-dimensional (3D) core-shell structured nanoarray composed of hierarchical porous CuO nanowires@NiCo layered double hydroxide nanosheets (CuO NWAs@NiCo-LDH) on copper foam (CF). The hierarchical NiCO-LDH nanosheets were grafted vertically along the CuO nanowire backbones. The synthesized material was used as a binder-free electrode material for high-performance supercapacitors. This unique microstructure provided ultrafast electrolyte transport and electron transfer. Groups of holes and splits present in the CuO NWAs@NiCo-LDH arrays served as ion-reservoirs (i.e., they hosted electrolyte ions). This well-designed 3D core−shell structure provided both efficient contact between electrolyte and active materials and facilitated electron and ion transportation. The CuO NWAs@NiCo-LDH electrode showed a great specific capacitance of 2453F∙g-1 at 2A∙g-1 and maintained a high specific capacitance of 1975F∙g-1 as the current density increased to 50A∙g-1. Rate retention values as high as 80.5% were observed, and 95.8% of the capacitance was retained after 10,000 cycles at 50A∙g-1 in a 6 M KOH. Moreover, the CuO NWAs@NiCo-LDH//rGO asymmetric supercapacitor (ASC) device was fabricated and operated at an operating voltage of 1.5V, which had a high specific capacitance of 147.2F∙g-1 at 1A∙g-1. Meanwhile, the ASC device revealed the highest energy density of 46 Wh kg-1 at a power density of 750 W kg-1 and excellent cycling stability (91.5% capacitance retention after 5000 cycles at 6 A∙g-1). The rational design of 3D core-shell nanostructure might provide new strategies for fabricating promising electrode materials for supercapacitors.

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Publication details

The article was received on 06 Jun 2017, accepted on 11 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA04908K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Synthesis of hierarchical porous CuO Nanowire@NiCo-layered double hydroxide core-shell structured nanoarrays on copper foam for high-performance supercapacitors

    G. Hengzhi, B. Qing, S. Wu, O. K.S. Hui and Z. Erfan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04908K

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