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Synthesis and Characterization of Core-shell Nanoparticles Anchored Reduced Graphene Oxide (rGO) and Kinetic Investigation of Oxygen Evolution from Water Oxidation in the Presence of these Nanocatalysts

Nouri, Omid | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51699 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Rahman Setayesh, Shaherbanoo; Taherinia, Davood
  7. Abstract:
  8. The reaction of oxygen evolution, in other words, the process of water oxidation in the presence of heterogeneous photocatalysts such as g-C3N4, Co/g-C3N4 /rGO, Ni/g-C3N4/rGO, CoNi/g-C3N4 / rGO, Co2Ni1/g-C3N4/rGO, and Co1Ni2 /g-C3N4 /rGO were studied. The characterization of these nanocatalysts was done by XRD, SEM, FT-IR, BET, DRS, CHN, and TGA techniques. Thermogravimetric analysis (TGA) was used to check the thermal stability of these nanocatalysts. The FT-IR spectroscopy was used to identify the functional groups in graphitic carbon nitride and to confirm g-C3N4 synthesis. According to BET results, the pore sizes were determined which were at the nano and macro scale. It was found that as a result of using reduced graphene oxide, the surface area of these nanocatalysts reached to about 32 m2.g-1of catalysts. Using the DRS spectrum, band gap of g-C3N4 and other photocatalysts were obtained. It was determined that the g-C3N4 band gap was about the theoretical values calculated in papers and equals to 2.7 eV and the band gap of the synthesized photocatalysts was less than this value. Therefore, the photocatalytic reactions have been improved. In the other part of this research, at first, the required and optimal time for photocatalytic reaction was investigated. In the next step, the optimal percentage of the metals that produced the highest amount of oxygen was determined. The effect of the sacrificial reagent on the oxygen evolution reaction in the presence of these nanocatalysts was investigated. Any oxygen was not produced in case of the addition electron donor sacrificial reagent but in the presence of the electron-acceptor reagents, the speed of oxygen production increased in the early hours of the reaction
  9. Keywords:
  10. Water Oxidation Complex ; Graphitic Carbon Nitride ; Sacrificial Reagent ; Reduced Graphene Oxide ; Oxygen Evoloution Reaction (OER)

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