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- Title
One-Step Hydrothermal Synthesis of CoNi<sub>2</sub>S<sub>4</sub> for Hybrid Supercapacitor Electrodes.
- Authors
Liu, Peng; Sui, Yanwei; Wei, Fuxiang; Qi, Jiqiu; Meng, Qingkun; Ren, Yaojian; He, Yezeng
- Abstract
In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi2S4 nanostructure similar to rambutan fruit. The surface microstructural study clearly visualized that the rambutan-like CoNi2S4 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. CoNi2S4 with a rambutan-like hierarchical structure showed an excellent specific capacitance of 944 F g − 1 at 1 A g − 1 , considerable rate capacitance (75.6% retention at 10 A g − 1 ) and excellent cycling life (91.1% retention after 5000 circulations) in the three-electrode system. Besides, the assembled hybrid supercapacitor based on CoNi2S4 and reduced graphene oxide exhibited a high specific energy density of 23.58 Wh kg − 1 at the power density of 800 W kg − 1 . In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi2S4 nanostructure similar to rambutan fruit. The close attachment of the nanorods to the spheres increases the active areas of the electrode. The CoNi2S4 shows an excellent specific capacitance of 944 F g − 1 at 1 A g − 1 , considerable rate capacitance (75.6% retention at 10 A g − 1 ) and excellent cycling life of 91.1%.
- Subjects
SUPERCAPACITOR electrodes; HYDROTHERMAL synthesis; ENERGY density; POWER density; GRAPHENE oxide; NANORODS
- Publication
NANO, 2019, Vol 14, Issue 7, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292019500887