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

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 co...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-06, Vol.33 (16), p.12819-12831
Main Authors: Xu, Ying-Ge, Liu, Jian, Kong, Ling-Bin
Format: Article
Language:English
Subjects:
Anodes
Capacitors
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cobalt sulfide
Composite materials
Diffusion coefficient
Electrode materials
Graphene
Materials Science
Metal sulfides
Nanosheets
Nanospheres
Optical and Electronic Materials
Reaction kinetics
Sodium
Specific energy
Titration
Walnuts
Zinc
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Summary: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 CoS 2 nanospheres embedded on two dimensional reduced graphene oxide nanosheets (Zn-CoS 2 /rGO) composites are prepared by a simple hydrothermal method. The optimized Zn-CoS 2 /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-CoS 2 /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-CoS 2 /rGO composites possess higher diffusion coefficient than CoS 2 /rGO. The SICs assembled by Zn-CoS 2 /rGO anodes and Walnut shells-derived porous carbon cathodes exhibit outstanding specific energy and power. This work confirms that Zn-CoS 2 /rGO are promising anodes to prepare high-performance SICs.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-08227-4