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Synthesis and Electrochemical Characterization of Graphene Based Nanocomposites Containing Iron oxide and Titanium dioxide and Use them as Electrodes in Asymmetric Supercapacitors

Abbasali Karajabad, Zeinab | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53106 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Transition metal oxides and carbon based materials (especially graphene) are common electrode materials in supercapacitors. The metal oxide limitation is due to their high agglomeration and low electrical conductivity. On the other hand graphene base materials due to their unique structure as well as high electrical conductivity and high surface area increase energy storage capability. However, chemically produced graphene generally suffers from high agglomeration and re-stacking after removal from the solution and drying, g, which results in reduced electrochemical performance of graphene sheets in supercapacitors. To take full advantage of these two groups of materials, it is expected that graphene / metal oxide composites will be an effective and practical method. . In the first phase of the study, the reduced graphene oxide, iron oxide and titanium dioxide nanoparticles were synthesized and confirmed by characterization methods and then electrochemical studies of all three materials were performed. In the second step, the reduced graphene oxide-iron oxide and reduced graphene oxide-titanium dioxide nanocomposites were synthesized via a simple and low-cost hydrothermal method, and the characterization results confirmed the formation of these nanocomposites. The electrochemical behavior of these nanocomposites was investigated, they respectively afforded specific capacitance of 130 F / g and 253 F / g at scan rate of 5 mV / s in 1 M KOH. The asymmetric supercapacitor was configured using reduced graphene oxide-titanium dioxide nanocomposite as cathode and reduced graphene oxide-iron oxide nanocomposite as anode and its electrochemical measurements were performed. The asymmetric supercapacitor in the 1 M KOH electrolyte exhibited working potential window of 1.6 V and offorded the energy and power density of 9.7 Wh / Kg and 1066 W / Kg at 1 A / g current density, respectively
  9. Keywords:
  10. Graphene ; Iron Oxide ; Titanium Dioxide ; Nanocomposite ; Asymmetric Supercapacitor

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