Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 20, Pages 9960-9969Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01805c
Keywords
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Funding
- National Natural Science Foundation of China [21301001, 51202001, 51402002]
- Anhui Provincial Natural Science Foundation [1708085ME120]
- Key Natural Science Research Project of Anhui Provincial Education Department [KJ2017A007]
- Youth Backbone Program of Anhui University
- Innovation Lab for Clean Energy and Green Catalysis
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Well-aligned hierarchical Cu(OH)(2)@Ni-2(OH)(2)CO3 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)@Ni-2(OH)(2)CO3 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)@Ni-2(OH)(2)CO3 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.
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