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Synthesis, Characterization and Photoelectrochemical Application of ZnO Nanorods Sensitized by Graphene

Eshghi, Behnam | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51114 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza; Naseri, Naeimeh
  7. Abstract:
  8. According to the growth in the world population and the decrease in fossil fuels resources and also according to the pollution caused by these unrenewable resources, using hydrogen as an alternative energy resource seems to be unavoidable. In the past decades, semi-conductor metal oxides were being used widely in the energy domain of study, due to their appropriate band gap in the ultra-violet and visible spectra. Among these metal oxides, ZnO has been under special attention because of its electron mobility and its reasonable production cost and also its friendliness to environment. But the high band gap of ZnO (3.2 eV) has impeded its use in visible light spectrum. In this project, synthesis and characterization of the physical and photochemical properties of zinc oxide (ZnO) Nanorods, sensitized with graphene, will be studied. in order to achieve this aim, first ZnO seeds are created using Sol-Gel method and then the N:ZnO Nanorods are formed by using hydrothermal method. This task is repeated in various conditions. Afterwards, scanning electron microscopy (SEM), diffuse reflective spectroscopy (DRS), and X-ray diffraction (XRD) are used respectively for studying the surface topography, optical properties, , and determination of the crystal structure of the produced samples. Finally, the photoelectrochemical properties of ZnO/Graphene samples is studied and analyzed during the water splitting reaction, for hydrogen generation, conducted under visible light irradiation; and the results is compared with pure ZnO catalysts
  9. Keywords:
  10. Graphene Oxide ; Hydrogen Producing ; Photoelectrochemical Cell ; Hydrothermal Method ; Sol-Gel Method ; Zinc Oxide Nanorods

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