Journal
JOURNAL OF ENERGY STORAGE
Volume 28, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.101199
Keywords
Supercapacitors; ZnO/NiS/CNT composite; Galvanostatic charge discharge; Cyclic voltammetry; Electrochemical impedance spectroscopy
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Funding
- Kyungsung University
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The design and preparation of an efficient electrode material with a multifunctional surface structure is a key challenge for high-performance supercapacitors. In this study, ZnO/NiS and ZnO/NiS/CNT nanocomposites were synthesized on a nickel foam substrate and used as an electrode material. The surface morphology and structure of the electrodes were analyzed by field emission- scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The prepared nanocomposite of ZnO/NiS/CNT exhibited a high specific capacitance of 879.0 F g(-1) at a current density of 1.5 A g(-1), along with remarkable cycling stability of 89.7% capacitance retention after 5000 cycles, which was superior to that of ZnO/NiS (805.75 F g(-1) and 74.59% retention). In addition, the ZnO/NiS/CNT electrode also exhibited good rate capability, faster ion and electron transfer ability, and higher surface area, highlighting its potential for electro-chemical energy storage.
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