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Surface topography control of NiS/Ni3S4 nanosheets for the promotion of electrochemical performance

  • ORIGINAL PAPER: NANO-STRUCTURED MATERIALS (PARTICLES, FIBERS, COLLOIDS, COMPOSITES, ETC.)
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Abstract

In this work, a two-step protocol was proposed to prepare NiS/Ni3S4 composite nanosheets as an electrode material for supercapacitors. The composite nanosheets were prepared by hydrothermal sulfuration on the α-Ni(OH)2 monolayer nanosheets that were produced by grinding the mixture of nickel salt and morpholine at room temperature. The results of morphology observation indicated that the composite prepared at 140 °C had sheet-like morphology and large lateral size. It presented high-specific capacitance (2070.0 F g−1 at current density of 2.5 A g−1) and excellent electrochemical stability (86% retention of initial capacitance after 10,000 charge–discharge cycles). It was considered that the high electrochemical performance of this composite could be attributed to its sheet-like morphology and the introduction of Ni3S4 phase.

A two-step protocol was proposed to prepare NiS/Ni3S4 composite nanosheets as an electrode material for supercapacitors. In the first step, Ni(OH)2 monolayer nanosheets were produced by grinding the mixture of nickel salt and morpholine at room temperature. In the second step, the Ni(OH)2 monolayer nanosheets were sulfurated to NiS/Ni3S4 composite nanosheets at hydrothermal conditions. Due to the well-defined sheet-like morphology, the nickel sulfide composite presented high electrochemical performance.

Highlights

  • NiS/Ni3S4 composite nanosheets were prepared by a two-step hydrothermal route.

  • α-Ni(OH)2 monolayer nanosheets were prepared at room temperature in first step.

  • Composite nanosheets were prepared by the sulfuration of hydroxide in second step.

  • Composite presented high performance due to its well-defined sheet-like morphology.

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Acknowledgements

The authors acknowledge the National Natural Science Foundation of China Grant No. 21606226.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Yantai University, 264005, Yantai, China

    Yanhong Li, Jü Xu, Hao Liu, Yuanyuan Liu, Meiri Wang, Jing Li & Hongtao Cui

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  1. Yanhong Li
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  2. Jü Xu
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  3. Hao Liu
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  4. Yuanyuan Liu
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Correspondence to Hongtao Cui.

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Li, Y., Xu, J., Liu, H. et al. Surface topography control of NiS/Ni3S4 nanosheets for the promotion of electrochemical performance. J Sol-Gel Sci Technol 87, 546–553 (2018). https://doi.org/10.1007/s10971-018-4737-4

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  • DOI: https://doi.org/10.1007/s10971-018-4737-4

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