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Electrochemical Synthesis of Ni-Mn-Cu-Se@NF Nanostructure by Different Applied Voltage Regimes as an Effective and Stable Electrode for Hydrogen Production

Ali Rahimi, Faezeh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58089 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad; Barati Darband, Ghasem
  7. Abstract:
  8. Among the new energies, hydrogen has been noticed due to its high energy density. Electrochemical production of hydrogen using electrocatalysts with high efficiency and cheap price is one of the effective solutions to achieve a clean and renewable energy source. Various studies have shown that after noble metals such as Pt, nickel has the highest electrocatalytic activity for hydrogen production. Alloying nickel with other intermediate metals is one of the effective methods to improve the catalytic activity of this metal, and among the intermediate metals that increase electrocatalytic properties, manganese and copper have a special place. Also, among different non-noble metals, selenide element has distinctive features such as high metallicity, large relative radius and small ionization energy. Based on the stated information, the purpose of this research is the electrochemical deposition of Ni-Mn-Cu-Se@NF nanostructure and the investigation of the electrocatalytic behavior of the created electrode for the reaction of hydrogen and oxygen evolution. . Since the applied potential can strongly affect the microstructure of the coating and as a result the electrocatalytic activity, in this study, different coating potentials (from -1.3 to -1.7 V) were used to optimize the coating structure. Various electrochemical tests were performed to measure the electrocatalytic activity and stability of the samples in 1 M KOH electrolyte. In order to study the surface characteristics of the created coatings, field emission scanning electron microscope (FESEM) equipped with energy diffraction spectrometer (XDS) and X-ray diffraction (XRD) were used. The results showed that the optimal Ni-Mn-Cu-Se@NF sample has a high electrocatalytic activity in the hydrogen evolution reaction with an additional potential of 50 mv at a current density of 10 mA.cm-2 and a Tafel slope of 43.6 mv.dec-1. . Also, in the reaction of oxygen evolution and urea oxidation, to reach the current density of 210 mA.cm-1, an additional potential of 1.457 and 1.303 volts is required, and the Tafel slope for OER and UOR is 41.6 and 45.7, respectively. (mv.dec-1) which shows the very high kinetics of OER and UOR reactions. The electrochemical active area for the optimal sample is equal to 2370 cm2 and the cell potential required in the OER-HER process to reach a current density of 10 mA.cm-2 is equal to 1.56 V and in the UOR-HER process it is equal to 1.36 V is The one-step and low-cost manufacturing method of the Ni-Mn-Cu-Se@NF coating and its electrocatalytic activity and high stability enable the commercial use of this electrode
  9. Keywords:
  10. Water Splitting ; Electrocatalysts ; Electrochemical Deposition ; Hydrogen Evolution Reaction ; Oxygen Evolution Reaction (OER) ; Nickel-Manganese-Copper-Selenium Coating

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