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Investigating the Electrochemical Behavior of Cobalt-Nickel-Manganese Hydroxide and Cobalt-Iron Sulfide on Nickel Nano-Structure Grown on Copper Wire for Use in Electrochemical Micro-Supercapacitor

Daemshad, Zahra | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57186 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Shahrokhian, Saeed
  7. Abstract:
  8. In the first part, trimetallic cobalt-nickel-manganese hydroxide was synthesized using the two-dimensional metal-organic framework Co-ZIF-L, on the three-dimensional and porous structure of nickel film, and its electrochemical performance was investigated. For this purpose, first, the three-dimensional and porous structure of nickel was grown by the electrolytic hydrogen bubble deposition method on copper wire, and then the 2D structure and leaf-like Co-ZIF-L were formed on the 3D-nickel structure by chemical method. In the next step, cobalt-nickel-manganese hydroxide composite was formed in reaction to Co-ZIF-L anion etching in the presence of nickel and manganese ions. Also, nickel-manganese hydroxide nanosheets were grown directly on the three-dimensional structure of nickel. FE-SEM images showed the formation of nickel-manganese hydroxide nanosheets on the two-dimensional and leaf-like structure of Co-ZIF-L. Crucial electrochemical evaluations (such as cyclic voltammetry and galvanostatic charge/discharge) and characterization techniques (such as XRD, IR, and TEM) were carried out for the prepared electrodes. According to the galvanostatic charge/discharge evaluations, the CoNiMn-OH/Ni/CW electrode in 2 M KOH electrolyte, rendered areal capacitance of 3.52 F/cm2 at a current density of 4 mA/cm2. Cyclic stability of the electrode is evaluated over 3000 GCD cycles, which retains 84% of its initial capacitance. Finally, the asymmetric micro-supercapacitor CW/Ni/CoNiMn-OH//rGO/CF was prepared, this micro-supercapacitor represented areal capacitance of 197.45 mF/cm2 at 1.4 mA/cm2. The maximum energy density for the prepared asymmetric micro-supercapacitor, was obtained 61.7 µWh/cm2 at a power density of 1.04 mW/cm2. In the second part, the electrichemical performance of Co-Fe sulfide and comparison with Co-Fe hydroxide was investigated. For this purpose, first, CoFe-LDH was grown by hydrothermal method on the three-dimensional and porous structure of nickel, and then the CoFeS electrode was prepared by sodium sulfide solution at four different temperatures. Crucial electrochemical evaluations (such as cyclic voltammetry and galvanostatic charge/discharge) and characterization techniques (such as XRD, IR, and SEM) were performed for the prepared electrodes. The h-CoFeS/Ni/CW electrode rendered areal capacitance of 5.03 F/cm2 at 4 mA/cm2. The asymmetric micro-supercapacitor prepared from h-CoFeS/Ni/CW electrode as positive electrode and rGO/CF electrode as negative electrode represented areal capacitance of 195.8 mF/cm2 at 4.5 mA/cm2. The maximum energy density, was obtained 62.69 µWh/cm2 at the power density of 3.57 mW/cm2.
  9. Keywords:
  10. Transition Metal Hydroxide ; Metal-Organic Framework ; Transition Metal Sulfide ; Copper Wire ; Microsupercapacitors ; Nickel Film ; Electrochemical Microsupercapacitors ; Three Metallic Hydroxide

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