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Issue 5, 2019
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Heterostructures of Ni–Co–Al layered double hydroxide assembled on V4C3 MXene for high-energy hybrid supercapacitors

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Abstract

An energy storage system based on a battery-type electrode and a capacitive electrode as a hybrid supercapacitor offers a promising way to construct devices with advantages of both rechargeable batteries and carbon-based supercapacitors. NiCoAl-LDH nanosheets uniformly grow onto micron-scaled MXene sheets to form a NiCoAl-LDH/V4C3Tx heterostructure with three-dimensional interconnected porous network microstructures by a hydrothermal method. NiCoAl-LDH/V4C3Tx composite electrodes show an excellent specific capacity of 627 C g−1 at a current density of 1 A g−1 in 1 M KOH. Especially, the NiCoAl-LDH/V4C3Tx electrodes exhibit a specific capacity of 300 C g−1 even at a high current density of 20 A g−1 in 1 M KOH, showing excellent rate performance. Hybrid supercapacitors, constructed with NiCoAl-LDH/V4C3Tx as the battery-type electrode and activated carbon (AC) as the capacitive electrode, show superior energy densities of 71.7 and 45.0 W h kg−1 at power densities of 830 and 20 000 W kg−1 in 1 M KOH, respectively. The excellent capacity retention rate is 98% for the hybrid device after 10 000 cycles at 20 A g−1 in 1 M KOH. The NiCoAl-LDH/V4C3Tx heterostructures can be used as promising electrode materials for low-cost hybrid supercapacitor devices.

Graphical abstract: Heterostructures of Ni–Co–Al layered double hydroxide assembled on V4C3 MXene for high-energy hybrid supercapacitors

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Publication details

The article was received on 22 Nov 2018, accepted on 03 Jan 2019 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11249E
Citation: J. Mater. Chem. A, 2019,7, 2291-2300

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    Heterostructures of Ni–Co–Al layered double hydroxide assembled on V4C3 MXene for high-energy hybrid supercapacitors

    X. Wang, H. Li, H. Li, S. Lin, J. Bai, J. Dai, C. Liang, X. Zhu, Y. Sun and S. Dou, J. Mater. Chem. A, 2019, 7, 2291
    DOI: 10.1039/C8TA11249E

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