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Effect of Selected Promotors on the Electrocatalytic Performance in Oxygen Evolution Reaction

Yousefi, Zahra | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56008 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Larimi, Afsaneh Sadat
  7. Abstract:
  8. During the last few decades, efforts have been made to replace fossil fuels with clean and non-absorbent energy sources. One of the promising strategies is energy production by hydrogen storage using water splitting. For this purpose, different methods of using light, heat and electricity are provided. Electrolysis of water with a simple environment such as very high purity of hydrogen produced, controllable, device, no need for high temperature and pressure in the reactor and huge potential for industrial applications has been very much considered. Water electrolysis consists of two reactions: reduction of water to hydrogen (HER) and oxidation of water to oxygen (OER). The second reaction includes the removal of four electrons and protons from two water molecules and a new bond of two oxygen atoms is considered as a limitation in the general process of water electrolysis. The limitation of water oxidation indirectly reduces the production of hydrogen gas in water electrolysis.To overcome this problem and increase efficiency, an electrocatalyst composed of iron, cobalt, and nickel based on iron was first synthesized and then calcined at three temperatures of 250 ℃, 350 ℃, and 450 ℃ to investigate the effect of calcination and sulfide. XRD, FTIR, FESEM, EDS and TEM identification techniques were used to evaluate the structure of the synthesized electrocatalysts. The electrocatalytic activity of the structures created by the linear scanning voltammetry curves at the current density of 210 mA.cm-1 and 1 M KOH solution was investigated in such a way that the excess potential was reduced from 432 mV to 327 mV with the FeCoNi-MOF electrocatalyst layer on the nickel foam. Also, with calcine and sulphide, the potential of the sample at 250 ℃ was reduced to 313 mV and 298 mV
  9. Keywords:
  10. Electrocatalysts ; Hydrogen Storage ; Water Splitting ; Water to Oxygen Oxidation (OER) ; Renewable Energy Resources ; Water Electrolysis

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