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Sheet-membrane Mn-doping nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery-supercapacitor hybrid device

Abstract

Efficient, robust and safe energy-storage systems occupy a vital position for the development of electronics industry, which strongly relies on the rational design of electrode materials. In the manuscript, a one-pot hydrothermal route was employed to prepare sheet-membrane Mn-doping nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles. Inner large nanosheets, outer ultrathin membranes and encapsulated Ni3S2 nanoparticles construct mechanically robust three-dimensional structure, which contributes to provide abundant active sites to participate in the electrochemical reaction. Density functional theory (DFT) calculations further reveal that, the introduction of Ni3S2 and Mn-doping in nickel hydroxide could obviously decrease deprotonation energy and shorten energy gap of Ni(OH)2, which is greatly in favor of electrochemical performance of electrode material. Directly employed in three-electrode alkaline supercapacitive electrode, NiMn-1 displays excellent capacitance performance 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 (maintaining 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 mAh g-1 (at 0.47 A g-1), high energy density of 51.5 Wh kg-1 (at 404 W kg-1) and suitable service lifespan. Therefore, these high-capacitance electrochemical performances endow it with more advantages in the energy-storage field.

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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, Accepted Manuscript
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    Sheet-membrane Mn-doping nickel hydroxide encapsulated via heterogeneous Ni3S2 nanoparticles for efficient alkaline battery-supercapacitor hybrid device

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

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