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Issue 13, 2014
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Hierarchical NiCo2O4 nanosheets@hollow microrod arrays for high-performance asymmetric supercapacitors

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Abstract

Novel hierarchical NiCo2O4 nanosheets@hollow microrod arrays (NSs@HMRAs) are fabricated by a simple and environmental friendly template-assisted electrodeposition followed by thermal annealing. Due to their unique nanostructures, the NiCo2O4 NSs@HMRAs, as electrodes, exhibited a high specific capacitance (Csp) (678 F g−1 at 6 A g−1) and outstanding cycle stability (Csp retention of 96.06% after 1500 cycles). The desirable superior capacitive performance of the NiCo2O4 NSs@HMRAs can be attributed to the large specific surface area, fast ion diffusion, and perfect charge transmission in the hierarchical NSs@HMRAs. The asymmetric supercapacitor (ASC) based on the NiCo2O4 NSs@HMRAs as a positive electrode and active carbon (AC) as a negative electrode was assembled and it exhibited a Csp of 70.04 F g−1 at 5 mV s−1 and a high energy density of 15.42 W h kg−1. Moreover, the NiCo2O4 NSs@HMRAs//AC ASC has an outstanding cycle stability (almost no Csp loss after 2500 cycles), making it promising as one of the most attractive candidates for electrochemical energy storage.

Graphical abstract: Hierarchical NiCo2O4 nanosheets@hollow microrod arrays for high-performance asymmetric supercapacitors

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Publication details

The article was received on 28 Nov 2013, accepted on 06 Jan 2014 and first published on 07 Jan 2014


Article type: Paper
DOI: 10.1039/C3TA14930G
Citation: J. Mater. Chem. A, 2014,2, 4706-4713
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    Hierarchical NiCo2O4 nanosheets@hollow microrod arrays for high-performance asymmetric supercapacitors

    X. Lu, D. Wu, R. Li, Q. Li, S. Ye, Y. Tong and G. Li, J. Mater. Chem. A, 2014, 2, 4706
    DOI: 10.1039/C3TA14930G

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