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Issue 39, 2018
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Sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery–supercapacitor hybrid devices

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Abstract

Efficient, robust and safe energy storage systems occupy a vital position in the development of the electronics industry; they rely strongly on the rational design of electrode materials. In this manuscript, a one-pot hydrothermal route was employed to prepare sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles. The inner large nanosheets, outer ultrathin membranes and encapsulated Ni3S2 nanoparticles construct a mechanically robust three-dimensional structure which provides abundant active sites to participate in electrochemical reactions. Density functional theory (DFT) calculations further reveal that the introduction of Ni3S2 and Mn-doping in nickel hydroxide obviously decrease the deprotonation energy and shorten the energy gap of Ni(OH)2, which greatly favors the electrochemical performance of the electrode material. When directly employed in a three-electrode alkaline supercapacitive electrode, NiMn-1 displays excellent capacitance of 385.6 mA h g−1 at 0.68 A g−1, enhanced rate performance (reaching 56.7% retention at 34 A g−1) and outstanding cycling stability (retaining 95.6% after 3000 cycles). Furthermore, a battery–supercapacitor hybrid device was developed based on this electrode material. The device also exhibits excellent capacitance of 59.7 mA h g−1 (at 0.47 A g−1), a high energy density of 51.5 W h kg−1 (at 404 W kg−1) and a suitable service lifespan. Therefore, this high-capacitance electrochemical performance endows the device with further advantages in the energy storage field.

Graphical abstract: Sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery–supercapacitor hybrid devices

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Publication details

The article was received on 17 May 2018, accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA04613A
Citation: J. Mater. Chem. A, 2018,6, 19020-19029
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    Sheet-membrane Mn-doped nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery–supercapacitor hybrid devices

    L. Ye, Y. Zhou, Z. Bao, Y. Zhao, Y. Zou, L. Zhao and Q. Jiang, J. Mater. Chem. A, 2018, 6, 19020
    DOI: 10.1039/C8TA04613A

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