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Binder-free 3D graphene nanostructures on Ni foam substrate for application in capacitive deionization

Talebi, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.diamond.2021.108612
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. Hereby a simple, low-cost and scalable route is being presented for preparation of binder-free electrodes of reduced graphene oxide (RGO) on Ni foam (Ni/Gr). In this regard, the Ni foams are dipped in graphene oxide (GO) slurry. Next, the GO loaded Ni foams are kept in a freeze dryer for 24 h and heated up to 800 °C in an inert atmosphere. In this approach, the amount of active materials can be easily optimized for capacitive deionization (CDI). The characterization of Ni/Gr electrodes revealed a 3D porous assembly of RGO on Ni substrate which is helpful for the fast ion diffusion and rapid electron transport. The electrochemical performance of the prepared electrodes is investigated in both 3-electrode system and symmetric 2-electrode assembly. Then, the prepared electrodes are applied for capacitive deionization (CDI) studies in saline water samples. Results revealed a specific capacitance of about 77 F/g (in 1 M of NaCl at 2.5 A/g) and an ion removal capacitance of 22.3 mg/g (in 50 mL of 500 ppm of NaCl) for the fabricated system. The stability of the CDI system was surveyed in 500 ppm of NaCl solution which showed 65% of the initial capacity after 200 consecutive cycles (9 days). These results indicate that this method is efficient for both supercapacitive energy storage applications and CDI technology. © 2021 Elsevier B.V
  6. Keywords:
  7. Capacitance ; Electrochemical electrodes ; Electron transport properties ; Graphene ; Saline water ; Sodium chloride ; 3D graphene ; Binder free ; Binder-free electrode ; Capacitive deionization ; Foam substrates ; Low-costs ; Ni foam ; Nickel foam ; Reduced graphene oxides ; Simple++ ; Desalination
  8. Source: Diamond and Related Materials ; Volume 120 , 2021 ; 09259635 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925963521003757