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Zn-doped CoS2 nanospheres embedded on two dimensional reduced graphene oxide nanosheets as anode materials for enhanced sodium-ion hybrid capacitors

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Abstract

Sodium-ion hybrid capacitors (SICs) combine two merits of high energy density of batteries and superior power density of supercapacitors. Currently, metal sulfides are potential anode materials for SICs owing to their high theory specific capacity. Nevertheless, metal sulfides with low electronic conductivity and sluggish reaction kinetics suffer from inferior rate capability and poor circulation stability as anodes. Therefore, improving electronic conductivity and Na+ diffusion kinetics for metal sulfides are some effective promotion strategies. Herein the Zn-doped CoS2 nanospheres embedded on two dimensional reduced graphene oxide nanosheets (Zn-CoS2/rGO) composites are prepared by a simple hydrothermal method. The optimized Zn-CoS2/rGO deliver high specific capacity of 544.3 mA h g−1 at specific current of 0.1 A g−1 after 100 cycles. Impressively, Zn-CoS2/rGO display an excellent rate capability of 286.8 and 226.1 mA h g−1 at 2000 and 5000 mA g−1, respectively. Galvanostatic intermittent titration technique (GITT) analysis demonstrates that Zn-CoS2/rGO composites possess higher diffusion coefficient than CoS2/rGO. The SICs assembled by Zn-CoS2/rGO anodes and Walnut shells-derived porous carbon cathodes exhibit outstanding specific energy and power. This work confirms that Zn-CoS2/rGO are promising anodes to prepare high-performance SICs.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51971104, 51762031) and the Key Research Program of Education Department of Gansu Province (GSSYLXM-03).

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  1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Ying-Ge Xu, Jian Liu & Ling-Bin Kong

  2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Ling-Bin Kong

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Y-GX: Writing-original draft, investigation, data curation, project administration, validation. JL: Methodology, conceptualization, visualization, software, resources. L-BK: writing-reviewing and editing, funding acquisition, formal analysis, supervision.

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Xu, YG., Liu, J. & Kong, LB. Zn-doped CoS2 nanospheres embedded on two dimensional reduced graphene oxide nanosheets as anode materials for enhanced sodium-ion hybrid capacitors. J Mater Sci: Mater Electron 33, 12819–12831 (2022). https://doi.org/10.1007/s10854-022-08227-4

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