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Issue 14, 2018
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A robust hierarchical microcapsule for efficient supercapacitors exhibiting an ultrahigh current density of 300 A g−1

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Abstract

A unique three dimensional (3D) hierarchical microcapsule structure (NiSx@NCV) has been put forward, which is realized by the ensemble of N-doped carbon vesicles encapsulating dual-NiSx (α-NiS/NiS2) nanoparticles via an in situ nanospace-confined pyrolysis strategy. The NiSx@NCV shows a high pseudocapacitance of 1600 F g−1 at 1 A g−1 and impressive rate performance (a capacitance retention ratio of 84.5%, from 1 to 25 A g−1). Benefiting from this intriguing configuration, a kind of high performance asymmetric supercapacitor (ASCs) has been fabricated, using 3D NiSx@NCV microcapsules and nanoporous carbon (NPC) as positive and negative electrodes, respectively. Remarkably, the fabricated ASCs achieve a capability of 135.06 F g−1 at 1 A g−1 and exhibit an outstanding rate capability at 32 A g−1. More importantly, a high capacitance retention ratio of 87% is still achieved even at current densities from 32 to 300 A g−1, which exhibits well the ultrahigh rate performance of the NiSx@NCV//NPC ASCs. In addition, the NiSx@NCV//NPC ASCs deliver an attractive energy density of 48.02 W h kg−1 at a power density of 800 W kg−1, and still maintain 30 W h kg−1 even at an ultrahigh power density of 240 kW kg−1. This is attributed to the rich redox reaction and interface effect of dual-NiSx nanoparticles, abundant active sites and high electrical conductivity from N-doped carbon vesicles.

Graphical abstract: A robust hierarchical microcapsule for efficient supercapacitors exhibiting an ultrahigh current density of 300 A g−1

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Publication details

The article was received on 09 Jan 2018, accepted on 18 Feb 2018 and first published on 23 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00255J
Citation: J. Mater. Chem. A, 2018,6, 5724-5732
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    A robust hierarchical microcapsule for efficient supercapacitors exhibiting an ultrahigh current density of 300 A g−1

    C. Yang, M. Shi, X. Song, X. Zhao, L. Zhao, J. Liu, P. Zhang and L. Gao, J. Mater. Chem. A, 2018, 6, 5724
    DOI: 10.1039/C8TA00255J

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