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One-Step Hydrothermal Synthesis of CoNi<sub>2</sub>S<sub>4</sub> for Hybrid Supercapacitor Electrodes

Peng LiuSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaYanwei SuiSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaFuxiang WeiSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaJiqiu QiSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaQingkun MengSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaYaojian RenSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. ChinaYezeng HeSchool of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China

2019en

ABI

Annotatsiya

In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi 2 S 4 nanostructure similar to rambutan fruit. The surface microstructural study clearly visualized that the rambutan-like CoNi 2 S 4 consists of nanorods grown directly on the surface of spherical core structures. The close attachment of the nanorods to the spheres increased the active areas of the electrode, which facilitates efficient charge transport from the nanorods to the spherical core structure. CoNi 2 S 4 with a rambutan-like hierarchical structure showed an excellent specific capacitance of 944[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], considerable rate capacitance (75.6% retention at 10[Formula: see text]A[Formula: see text]g[Formula: see text]) and excellent cycling life (91.1% retention after 5000 circulations) in the three-electrode system. Besides, the assembled hybrid supercapacitor based on CoNi 2 S 4 and reduced graphene oxide exhibited a high specific energy density of 23.58[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at the power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text].

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Identifikatorlar

DOI: 10.1142/s1793292019500887

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