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Jabbari, Elahe | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40905 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem; Afshar, Abdollah
  7. Abstract:
  8. Electrochemical supercapacitors are the charge-storage devices having high power density.The materials in the nano-size form with high surface area and high porosity give the best performances as the electrode materials for supercapacitors because of their distinctive characteristics of conducting pathways, and nanoscale dimensions. Therefore, the synthesis and the capacitive characterization of the high surface area nanomaterials such as nanotubes, nanowires,etc, have been carried out extensively in the past few years. In this research Polyaniline nanowires were electrochemically deposited on stainless steel electrode with the technique of Choronoamperometry and pulse Voltammetry and characterized by cyclic voltammetry and charge-discharge cycling for supercapacitive properties. The mechanism of electrodeposition was analyzed with the technique of Cyclic Voltammetry and Choronoamperometry.the morphology of coating were investigated by using a scanning electron microscope(SEM). According to the results,electrodeposition was controlled with diffusion with a limited and steady state current and the mechanism of nucleation is absolutely uniform.SEM images of the polyaniline nanowires show that The diameter of the nanowires is in the range of 100-150 nm at the technique of Choronoamperometry and in the range of 40-70 nm at the technique of pulse Voltammetry. the PANI nanowire arrayed electrodes has an excellent specific capacitance, and the electrode has high efficiency of charge/discharge cycling at a large current density, which is very important for the electrode materials of a supercapacitor to provide high power density
  9. Keywords:
  10. Polyaniline ; Supercapacitor ; Nanowire ; Electrodeposition

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