In Situ Binder-Free and Hydrothermal Growth of Nanostructured NiCo<sub>2</sub>S<sub>4</sub>/Ni Electrodes for Solid-State Hybrid Supercapacitors
Herein, we report a comparison of the electrochemical performance of two kinds of NiCo<sub>2</sub>S<sub>4</sub>-based electrodes for solid-state hybrid supercapacitors (HSCs). For the binder-free electrode, NiCo<sub>2</sub>S<sub>4</sub> was grown on Ni...
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| Auteurs principaux: | , , , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/96b5e81ebcf044eebc1a5169625d9e76 |
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| Résumé: | Herein, we report a comparison of the electrochemical performance of two kinds of NiCo<sub>2</sub>S<sub>4</sub>-based electrodes for solid-state hybrid supercapacitors (HSCs). For the binder-free electrode, NiCo<sub>2</sub>S<sub>4</sub> was grown on Ni foam by the chemical bath deposition (CBD) method. For the binder-using electrode, NiCo<sub>2</sub>S<sub>4</sub> powder was synthesized by the hydrothermal method. FESEM images depicted the hierarchical nanostructure of NiCo<sub>2</sub>S<sub>4</sub> synthesized by the hydrothermal method and uniform distribution of nanostructured NiCo<sub>2</sub>S<sub>4</sub> grown on Ni foam by the CBD method. Half-cell studies of both NiCo<sub>2</sub>S<sub>4</sub> electrodes showed them exhibiting battery-type charge storage behavior. To assemble HSCs, NiCo<sub>2</sub>S<sub>4</sub> and activated carbon were used as a positive and negative electrode, respectively. Electrochemical studies of the HSCs showed that the accessible potential window was wide, up to 2.6 V, through cyclic voltammetry (CV) analysis. Chronopotentiometry (CP) studies revealed that the energy and power densities of binder-using HSC were 51.24 Wh/kg and 13 kW/kg at 1 Ag<sup>−1</sup>, respectively, which were relatively higher than those of the binder-free HSC. The binder-free HSC showed 52% cyclic stability, relatively higher than that of the binder-using HSC. Both HSCs, with unique benefits and burdens on energy storage performance, are discussed in this work. |
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