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Nanowires-assembled Co3O4@NiCo2O4 Architectures for High Performance All-Solid-State Asymmetric Supercapacitors

Abstract

Effictively composited materials with optimized structure exhibited promising potential in improving the electrochemical performances of supercapacitors in the past few years. Herein, we proposed a rational design to fabricate two-dimentional (2D) Co3O4@NiCo2O4 architectures composed of nanowires on Ni foam substrate by two steps of hydrothermal processing. Owing to the synergistic effect between Co3O4 scaffolds and the well-defined NiCo2O4 nanowires, the hierarchical electrodes achieved remarkable electrochemical performances with high areal specific capacitance of 9.12 F/cm2 at the current density of 2 mA/cm2. Both all-solid-state symmetrical supercapacitors based Co3O4@NiCo2O4//Co3O4@NiCo2O4 and asymmetric supercapacitor based Co3O4@NiCo2O4//activated carbon are fabricated with excellent electrochemical performance, respectively. The all-solid-state asymmetric supercapacitor with a maximum voltage of 1.0V delivered a high areal specific capacitance of 1343.7 mF/cm2 at 2 mA/cm2, and excellent cycling stability with no obvious capacitance attenuation after 5000 cycles at the current density of 10 mA/cm2 and high energy density of 75.6 Wh/kg with the power density of 1053 W/kg. After rapid charging (2 s), both supercapacitors in series could lighten a red LED for a long time and drive a mini intelligent electronic device effectively, demonstrating advances in energy storage, scalable integrated applications, and promising commercial potential.

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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, Accepted Manuscript
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    Nanowires-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, Accepted Manuscript , DOI: 10.1039/C7TA06437C

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