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Issue 20, 2017
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Hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire arrays in situ grown on three-dimensional copper foam for high-performance solid-state supercapacitors

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Abstract

Well-aligned hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire arrays were prepared on conductive copper foam via a simple in situ oxidation reaction and subsequent hydrothermal method for high-performance solid-state supercapacitors. Such novel hierarchical architectures integrate the merits of macroporous copper foam and the core/shell nanowire arrays such as superior electrical conductivity, enlarged surface area, and fast charge transport and ion diffusion. The areal capacitance of this typical hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire array reaches 1.09 F cm−2 at a current density of 1.0 mA cm−2, much higher than that of pristine Cu(OH)2 nanowire arrays (0.36 F cm−2). In addition, a remarkable rate capability (0.91 F cm−2 at a current density of 25 mA cm−2) and excellent cycling stability (86.1% after 10 000 cycles) were observed. Moreover, the hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire arrays were also used as the positive electrodes to fabricate solid-state asymmetric supercapacitor devices, exhibiting a high cell voltage of 1.6 V and largely enhanced energy density up to 1.01 W h cm−2. The improvement in electrochemical behaviors is attributed to the unique hierarchical architecture and the component synergistic effect. This work provides a scalable and promising strategy for the synthesis of well-defined core/shell nanoarrays as energy storage and conversion devices.

Graphical abstract: Hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire arrays in situ grown on three-dimensional copper foam for high-performance solid-state supercapacitors

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Publication details

The article was received on 27 Feb 2017, accepted on 23 Apr 2017 and first published on 24 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01805C
Citation: J. Mater. Chem. A, 2017,5, 9960-9969
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    Hierarchical Cu(OH)2@Ni2(OH)2CO3 core/shell nanowire arrays in situ grown on three-dimensional copper foam for high-performance solid-state supercapacitors

    S. Zhu, Z. Wang, F. Huang, H. Zhang and S. Li, J. Mater. Chem. A, 2017, 5, 9960
    DOI: 10.1039/C7TA01805C

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