An extra-long-life supercapacitor based on NiO/C&S composite by decomposition of Ni-based coordination complex. (5th September 2018)

• Record Type: Journal Article
• Authors: Shi, Fa-Nian; Jiang, Jun; Xiao, Hongping; Li, Xinhua
• Is Part Of: Materials & design. Volume 153(2018)
• Page Start: 203
• Page End: 210
• Publication Date: 2018-09-05
• Subjects: Nickel oxide -- Supercapacitor -- Composite -- Coordination complex -- Precursor; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.05.004
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: 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 NiO/C&S nanocomposite is fabricated by sintering a Ni-based coordination complex precursor at 450 °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 NiO nanoparticles, incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>5000 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 NiO/C&S composite will be promising for commercial applications. Graphical abstract: Unlabelled Image Highlights: A tightly packed NiO/C&S nanocomposite is fabricated by sintering a Ni-based coordination complex precursor. Extra-long cycling stability (> 5000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The continuous C and S play a key role in forming of the tightly packed structure.