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Flexible and mechanically durable asymmetric supercapacitor based on nico-layered double hydroxide and nitrogen-doped graphene using a simple fabrication method
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Flexible and mechanically durable asymmetric supercapacitor based on nico-layered double hydroxide and nitrogen-doped graphene using a simple fabrication method

Mehrabimatin, B

Flexible and mechanically durable asymmetric supercapacitor based on nico-layered double hydroxide and nitrogen-doped graphene using a simple fabrication method

Mehrabimatin, B ; Sharif University of Technology | 2019

401 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/ente.201801002
  3. Publisher: Wiley-VCH Verlag , 2019
  4. Abstract:
  5. A high-performing, lightweight, and flexible asymmetric supercapacitor (ASC) using NiCo-layered double hydroxide (NiCo LDH) supported on 3D nitrogen-doped graphene (NG) as a positive electrode and NG as a negative electrode is demonstrated. Highly conductive NG provides fast electron transfer and facilitates (dis)charging of NiCo LDH deposited on it. The composite electrode of NiCo LDH@NG exhibits a high specific capacitance of 1421 F g −1 at 2 A g −1 . Moreover, the as-obtained hybrid electrode shows an excellent rate capability with a specific capacitance of 1397 F g −1 at a high current density of 10 A g −1 , which is about 98% of the capacitance obtained at 2 A g −1 . The flexible ASC device shows a specific capacitance of 109 F g −1 at 0.5 A g −1 and a maximum energy density of 49 W h kg −1 , which is comparable with or superior to previously reported electrodes based on nickel-cobalt hydroxides. Furthermore, an excellent mechanical stability is obtained. Under repeated mechanical bendings, the ASC demonstrates high bending stability up to 450 bending cycles at a 90° angle. Hence, this flexible NiCo LDH@NG electrode that is free of binders and conductive agents shows superior performance and stability, and is a promising candidate for the future wearable energy storage devices
  6. Keywords:
  7. Asymmetric supercapacitors ; Flexible ; NiCo LDH ; Nitrogen-doped graphene ; Binary alloys ; Capacitance ; Cobalt compounds ; Doping (additives) ; Electrodes ; Graphene ; Mechanical stability ; Nickel compounds ; Nitrogen ; Supercapacitor ; Asymmetric supercapacitor ; Fast electron transfer ; High current densities ; High specific capacitances ; Layered double hydroxides ; Nitrogen doped graphene ; Cobalt alloys
  8. Source: Energy Technology ; Volume 7, Issue 5 , 2019 ; 21944288 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/ente.201801002