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Synthesis, Characterization and Studying of Photoelectrochemical (PEC) Properties for TNA/Ag2S Nanostructures

Gholami, Mostafa | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44389 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Ali Reza; Moradlo, Omran
  7. Abstract:
  8. Free-standing TiO2 nanotube array (TNA) films were fabricated via two-step anodization of titanium sheet. The electrolyte consisted of DI water and ethylene glycol (99.9%, Merck) solution with volume ratio of 10:90, containing 0.5 M NH4F. Then, a few drops of 1M H3PO4 aquaes solution have been added to adjust pH at 5.7. The anodization process was performed at optimized applied voltage of 60 V for 200 min. Indeed it does in two-step for 50 and 150 min, and samples were sonicated of 40s between two steps. Then, to crystallize the grown structures, they were annealed in air at 500˚C for 80 minutes. Surface of TNA was modified by sequential-chemical bath deposition (S-CBD) method to fabricate Ag2S nanoparticles and forming Ag2S/TNA nanostructure.The surface morphology, optical properties, crystalline structure and surface elementsstoichiometry samples have been studied By field emission scanning electron microscopy, UV–visible diffuse reflectance absorption spectra (DRS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) respectively. Maximum photocurrent density of about 850 μA/cm2 was obtained for the system in visible light which showed 14.2 fold improvement as compared with the pure TNAs under similar conditions. The incident photon to current efficiency (IPCE) measurements indicated that the visible response of the samples reached to its maximum value of ~20% at wavelength of 600 nm for the Ag2S/TNA photoanodes
  9. Keywords:
  10. Silver Sulfide ; Sequential-Chemical Bath Deposition (S-CBD) ; Water Splitting ; Titanium Nanotube Arrays (TNA) ; Photoelectrochemical Cell

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