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Synthesis of carbon-based spinel nico2o4 nanocomposite and its application as an electrochemical capacitor

Shahraki, M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1007/s11664-017-5490-0
  3. Publisher: Springer New York LLC , 2017
  4. Abstract:
  5. In this study, a thermal method was used to synthesize spinel NiCo2O4 and carbon nanotubes (CNTs)@NiCo2O4 with an average size 50 nm and 20 nm, respectively. Addition of CNTs into NiCo2O4 noticeably increases the active surface area compared to pure spinel NiCo2O4. SEM analyses showed that the morphologies are spherical in both pure and composite samples. Uniform CNTs@NiCo2O4 nanoparticles exhibit high specific capacitance of 210 F g−1 at 2 A g−1 and a good retention capacity of 92.70% after 2500 cycles, which shows a considerable improvement compared to NiCo2O4. Additionally, an exceptional rate capability of about 73.2% was obtained at 50 A g−1. Such remarkable electrochemical performance of the CNTs@NiCo2O4 can be attributed to high specific surface area and also uniform structure whichincrease the exposure of active sites available for reaction on the surface shortened transport pathways for both electrons and ion. Also, volume change during the charge-discharge process is mainly alleviated compared to pure spinel NiCo2O4. A carbonaceous material such as the CNT facilitates the charge transfer and improves the stability of frame against volume change. © 2017, The Minerals, Metals & Materials Society
  6. Keywords:
  7. Electrical properties ; Specific capacity ; Carbon ; Charge transfer ; Electric discharges ; Electric properties ; Supercapacitor ; Surface reactions ; Yarn ; Carbonaceous materials ; Charge-discharge process ; Electrochemical capacitor ; Electrochemical performance ; High specific capacitances ; High specific surface area ; Specific capacities ; Spinel nickel cobaltite ; Carbon nanotubes
  8. Source: Journal of Electronic Materials ; Volume 46, Issue 8 , 2017 , Pages 4948-4954 ; 03615235 (ISSN)
  9. URL: https://link.springe.com/article/10.1007%2Fs11664-017-5490-0