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Fabrication, Characterization and Experimental Study on Photoelectrochemical Property of Reduced Titania Nanotube Arrays

Rabiai, Majid | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54278 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza
  7. Abstract:
  8. hydrogen considered as one of clean energy carriers and is the most promising alternative to fossil fuels. The production of hydrogen from photoelectrochemical water splitting using titanium dioxide nanotubes arrays (TNA) as a photoanode has been of interest to many researchers in recent years. In this study, TNAs were fabricated with two-step anodic oxidation method at a constant applied voltage of 60 V DC. The fabrication process was performed for duration time of 1, 2, 3, 4 and 5 hours. Photoelectrochemical analysis for the fabricated samples shows that TNA prepared for 3 hours anodic oxidation time exhibited the highest current density of 1 mA.cm-2 at 0.5 V bias voltage (Optimized sample). Based on the FESEM observations, length, internal radius and wall thickness for the optimized sample are measured at 4.3 µm, 62.0 nm and 39.0 nm, respectively. DRS analysis was performed to evaluate the optical spectrum and the absorbance of the samples. The energy band gap then was calculated using the Tauc diagram for the unreduced TNA of 3.2 eV and for the reduced TNA of 3.0 eV. XRD analysis is used to identify the phase identification of anatase (101) crystal structure. It was found that the oxygen deficiency in the TNA improves the photoelectrochemical properties of the samples. In order to create oxygen deficiency, the optimized sample was subjected to plasma argon process and the effect of change in plasma power and plasma process time was investigated. According to the photoelectrochemical data analysis, the reduced TNAs (TiO2-x nanotube arrays), demonstrated the highest current density of 1.5 mA.cm-2 at 0.5 V with an applied plasma power of 30 W for 30 min
  9. Keywords:
  10. Water Splitting ; Oxygen Deficiency ; Hydrogen Producing ; Titanium Oxide Beta Nanotube ; Photoelectrochemical Water Splitting ; Radio Frequency Plasma

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