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Nanowire-assembled Co3O4@NiCo2O4 architectures for high performance all-solid-state asymmetric supercapacitors

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Abstract

Effectively composited materials with optimized structures have exhibited promising potential in improving the electrochemical performances of supercapacitors in the past few years. Herein, we proposed a rational design to fabricate two-dimensional (2D) Co3O4@NiCo2O4 architectures composed of nanowires on a Ni foam substrate via two steps of hydrothermal processing. Owing to the high activity of the Co3O4 scaffolds and the well-defined NiCo2O4 nanowires, the hierarchical electrodes achieved remarkable electrochemical performances with a high areal specific capacitance of 9.12 F cm−2 at the current density of 2 mA cm−2. Both all-solid-state symmetrical supercapacitor based Co3O4@NiCo2O4//Co3O4@NiCo2O4 and asymmetric supercapacitor based Co3O4@NiCo2O4//activated carbon are fabricated with excellent electrochemical performances. The all-solid-state asymmetric supercapacitor with a maximum voltage of 1.6 V delivered a high areal specific capacitance of 1343.7 mF cm−2 at 2 mA cm−2, excellent cycling stability with no obvious capacitance attenuation after 5000 cycles at a current density of 10 mA cm−2, and a high energy density of 75.6 Wh kg−1 with a power density of 1053 W kg−1. After rapid charging (2 s), both supercapacitors in series could light a red LED for a long time and drive a mini intelligent electronic device effectively, demonstrating advances in energy storage, scalable integrated applications and a promising commercial potential.

Graphical abstract: Nanowire-assembled Co3O4@NiCo2O4 architectures for high performance all-solid-state asymmetric supercapacitors

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Publication details

The article was received on 23 Jul 2017, accepted on 05 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA06437C
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Nanowire-assembled Co3O4@NiCo2O4 architectures for high performance all-solid-state asymmetric supercapacitors

    Y. Lu, L. Li, D. Chen and G. Shen, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA06437C

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