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Development of Novel Electrocatalysts Based on the Use of Inexpensive Transition Metal Compounds for Application in the Oxygen Evolution Reaction (OER)

Zahed, Parsa | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57884 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Siroos; Asgharinezhad, Ali Akbar; Larimi, Afsaneh Sadat
  7. Abstract:
  8. In recent years, there have been many concerns about the environment. One of them is the increase in greenhouse gases that cause warming and air pollution. On the other hand, fossil fuels are running out, so we need to look for clean alternative fuels. One of these options is hydrogen gas, which can be produced with the help of electrocatalysts and the water splitting reaction. In the electrolysis of water, the oxygen evolution reaction (OER) limits the reaction kinetics, so the synthesis of efficient electrocatalysts is important. As a result, the goal of this work is the synthesis of a cheap electrocatalyst using transition metals. The basic compound used for this work was a cobalt-based metal-organic framework of the Co-ZIF-L type, which was obtained by placing Prussian Blue (PBA) on its surface and subsequent phosphidation process to the desired composition. For optimization, the temperature increase rate was also changed to reach the desired temperature for phosphidation the compound by a tube furnace. The selected values for the temperature increase rate were 1, 3, 5 and 10 °C/min, and the best material obtained was CeCoFe-P5. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to investigate the morphology of the obtained compounds. CeCoFe-P5 showed good performance at a current density of 20 mA/cm2, an overpotential of 288 mV and a Tafel slope of 49.5 mV/dec. It also showed good performance in a stability test conducted for 24 hours. It performed successfully in another stability test in which 1000 cyclic voltammetry cycles were performed
  9. Keywords:
  10. Electrocatalysts ; Metal-Organic Framework ; Transition Metals ; Transition Metal Phosphide ; Hydrogen Producing ; Oxygen Evolution Reaction (OER) ; Water Splitting

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