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Issue 2, 2020
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Ionothermal synthesis of three-dimensional hierarchical Ni3Se2 mesoporous nanosheet networks with enhanced performance for asymmetric supercapacitors

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Abstract

The development of three-dimensional (3D) hierarchical mesoporous architectures comprising two-dimensional (2D) thin nanosheets to improve the electrochemical performance of asymmetric supercapacitors (ASCs) is of great significance. Herein, we report a simple ionothermal strategy that uses an ionic liquid (1-butyl-3-methylimidazolium chloride) as the solvent to synthesize a Ni3Se2 3D hierarchical mesoporous nanosheet network (HMNN) in two stages: the formation a one-dimensional (1D) NiSe-nanorod framework and its subsequent transformation to the Ni3Se2 3D HMNN. The as-synthesized Ni3Se2 3D HMNN with a large specific surface area and a well-developed mesoporous structure can provide more active sites for redox reactions and promote electrolytic penetration and charge transfer, thereby achieving excellent electrochemical performance. The Ni3Se2 3D HMNN exhibits a high specific capacitance of 801 F g−1 at 3 A g−1 and superior cycling stability (retaining 80.2% of its specific capacitance after 10 000 cycles at 10 A g−1). Furthermore, the Ni3Se2 3D HMNN-based ASC exhibits a high energy density of 38.4 W h kg−1 at a power density of 794.5 W kg−1 and outstanding cycling stability (retaining 71.4% of its specific capacitance after 10 000 cycles at 2 A g−1). Impressively, two such ASC devices connected in series can light up an LED for ∼50 min, suggesting their great potential in high-performance ASCs.

Graphical abstract: Ionothermal synthesis of three-dimensional hierarchical Ni3Se2 mesoporous nanosheet networks with enhanced performance for asymmetric supercapacitors

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Supplementary files

Article information


Submitted
28 Oct 2019
Accepted
08 Dec 2019
First published
10 Dec 2019

J. Mater. Chem. A, 2020,8, 797-809
Article type
Paper

Ionothermal synthesis of three-dimensional hierarchical Ni3Se2 mesoporous nanosheet networks with enhanced performance for asymmetric supercapacitors

Y. Liu, Q. Xu, R. Wang, Y. Zheng, L. Zhu, Z. Wang and W. Zheng, J. Mater. Chem. A, 2020, 8, 797
DOI: 10.1039/C9TA11827F

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