Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 731, Issue -, Pages 560-568Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.078
Keywords
Carbon nanofibers; Eletrospinning; Flexible; Eletrochemical; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [51373155]
- Collaborative Innovation Center for Modern Textile Technology of Zhejiang Province (2011-Program) [20160202]
- 521 Talents Training Plan in Zhejiang Sci-Tech University
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Flexible supercapacitors with both high energy and high power densities are critical for flexible electronics. In this paper, hybrid flexible carbon nanofibers decorated with NiCo2S4 nanoparticles are successfully prepared by combination of electrospinning, carbonization and hydrothermal treatments. The obtained hybrid carbon nanofibers display remarkable specific capacitance (527.8 F g(-1) at the current density of 0.2 A g(-1) and 622.5 F g(-1) at 2 mV s(-1)), good rate capability (310.5 F g(-1) at 4.0 A g(-1)) and excellent cycle stability (retaining 90.0% after 3000 cycles). The flexible asymmetric supercapacitors based on carbon nanofibers decorated with NiCo2S4 and porous carbon nanofibers coated with activated charcoal are fabricated. The combined unique properties of each of these components enable highly flexible and mechanically strong films that can serve as electrodes directly without using any current collectors or binders. The fabricated device shows an energy density of 32.1 Wh kg(-1) at power density of 67.6 Wkg(-1) and cycle stability retaining 88.5% after 1500 cycles at 1.0 A g(-1). Therefore, the novel flexible asymmetric device with perfect flexibility and stability can be applied as one of the most promising power supplies. (C) 2017 Elsevier B.V. All rights reserved.
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