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Direct growth of nickel-cobalt oxide nanosheet arrays on carbon nanotubes integrated with binder-free hydrothermal carbons for fabrication of high performance asymmetric supercapacitors

Hekmat, F ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.compositesb.2019.05.027
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. A high performance asymmetric supercapacitor (ASC)has been fabricated by using nickel oxide-cobalt oxide nanosheets (NiO–CoO NSs), which were directly grown on carbon nanotubes (CNTs)and hydrothermal carbon spheres (HTCs)as positive and negative electrodes, respectively. Both electrode materials are binder-free prepared by using a catalytic chemical vapour deposition (CVD)approach followed by a facile hydrothermal method for cathode and a one-step environmental-friendly route called hydrothermal carbonization for anode. Using NiO–CoO NSs@CNTs and HTCs, which were directly grown on Ni foam, not only leads to a very small equivalent series resistance, but also provides an impressive capacitive performance. The assembled ASC exhibits remarkable capacitive performance over a broad operational potential window ensuring outstanding energy densities (84.625 Wh. kg−1 at 3 A g−1). Other noteworthy features of the prepared supercapacitor include its superior power density (7810 W kg−1 at 9.5 A g−1)and cycling stability with capacitance retention almost over 80% after 6000 cycles. These electrochemical results point to NiO–CoO NSs@CNTs-Ni//HTCs-Ni based asymmetric supercapacitors as a promising remedy for energy crisis and environmental deterioration problems. © 2019 Elsevier Ltd
  6. Keywords:
  7. Asymmetric supercapacitor ; Binary NiO–CoO nanosheets ; Carbon nanotubes (CNTs) ; Chemical vapour deposition (CVD) ; Hydrothermal ; Hydrothermal carbon spheres (HTCs) ; Anodes ; Binders ; Carbon nanotubes ; Carbonization ; Cathodes ; Chemical vapor deposition ; Cobalt deposits ; Deterioration ; Electric resistance ; Energy policy ; Fabrication ; Hydrochemistry ; Nanosheets ; Nickel oxide ; Supercapacitor ; Yarn ; Catalytic Chemical Vapour Deposition ; Chemical vapour deposition ; Environmental deterioration ; Equivalent series resistance ; Hydrothermal carbonization ; Hydrothermal carbons ; Cobalt compounds
  8. Source: Composites Part B: Engineering ; Volume 172 , 2019 , Pages 41-53 ; 13598368 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1359836819300198