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Application of TiO2 Nanotubes Fabricated by Anodizing of Titanium as a Suitable Substrate for Deposition of Active Materials for Use in the Supercapacitors

Faraji, Masoud | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47362 (07)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Gobal, Fereydoon
  7. Abstract:
  8. In this thesis, the improving effects of TiO2 nanotubes (TiO2NTs) fabricated by anodizing of titanium as suitable substrate for deposition active materiales in supercapacitors were considered. PANI/Pd/TiO2NTs electrodes with highly porous structures and good capacitive characteristics were prepared by electrodeposition of polyaniline on palladium nanoparticles loaded TiO2 nanotubes. The results illustrated that the specific capacitance of these electrodes was around 1060 Fg−1 in 1.0 M H2SO4 electrolyte as measured at a constant current of 2.0 Ag−1, whereas it was 210 Fg−1 for the PANI/TiO2NTs electrode. NiO-ZnO/TiO2NTs electrodes were synthesized by the electrodeposition of Zn–Ni onto TiO2 nanotubes, dealloying in a concentrated alkaline solution and finally calcination of the resulting Zn(OH)2–Ni(OH)2/TiO2NTs at 300 0C. The Microstructure studies revealed the nanoporous/cracked structures of the NiO-ZnO/TiO2NTs obtained at the electroplating time of 20 min. The electrochemical investigations showed that the specific capacitance of these electrodes were around 130 mF cm-2 in 1.0 M NaOH electrolyte as measured at a current density of 0.45 mA cm-2. RGO/TiO2NTs/Ti electrodes with high surface area and good capacitive characteristics were prepared by simple electrochemical reduction of graphene oxide (GO) onto the previously formed TiO2 nanotubes. Microstructure studies show that reduced graphene oxide (RGO) having high surface area has been deposited onto the TiO2NT arrays. The electrochemical data demonstrated that the electrodes displayed specific capacitance of 410 F g−1 at the current density of 50 A g−1.Nanoporous structures of cobalt oxide (Co3O4) electrodes were successfully fabricated by electroplating of zinc–cobalt onto TiO2 nanotubes, leaching of zinc in a concentrated alkaline solution and followed by drying and annealing at 400 °C. The SEM analysis showed that the obtained Co3O4 electrodes were composed of the nanoporous/cracked structures with an average pore size of about 100 nm. The electrochemical data demonstrated that the electrodes display good capacitive behavior with a specific capacitance of 430 F g−1 at a current density of 1.0 A g−1
  9. Keywords:
  10. Supercapacitor ; Polyaniline ; Graphene ; Titanium Nanotube Arrays (TNA) ; Graphene Oxide ; Electroplating ; Nickle Oxide ; Cobalt Oxide

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