Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 764, Issue -, Pages 684-690Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.153
Keywords
Mixed metal oxides; Supercapacitor; Composite; Coordination complex; Precursor
Categories
Funding
- National Natural Science Foundation of China [21571144, 21703158]
- Zhejiang Provincial Natural Science Foundation of China [LQ15B030001]
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Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed Co3O4/NiCo2O4/NiO/C&S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400 degrees C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller specific surface area analysis, and elemental analysis. The electrochemical performance is analyzed by cyclic voltammetry, galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry. A uniform nanocomposite was found to be formed of NiCo2O4, NiO, and Co3O4 nanoparticles, incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared Co3O4/NiCo2O4/NiO/C&S composite will be promising for commercial applications. (C) 2018 Elsevier B.V. All rights reserved.
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