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Synthesis and Evaluation of Nanostructured ZIF-67-Based Electrocatalysts for Oxygen Evolution Reaction

Bairami Sorkhehrizi, Zahra | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56209 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Ghotbi, Sirus; Larimi, Afsaneh Sadat; Esmaeilpour, Mohsen
  7. Abstract:
  8. Today, due to the decreasing of fossil fuel reserves and the need to use clean fuels, hydrogen is a suitable alternative, and hydrogen production has received considerable attention. One of the best methods of hydrogen production is water splitting. Overall water splitting can be divided into two half reactions including the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which selecting the appropriate electrocatalyst for these half reactions plays an important role. The four-electron transfer process in OER leads to slow kinetics of the reaction and a large overpotential. The noble metal-based oxides, including IrO2 and RuO2, are known as outstanding OER electrocatalysts, while their expensive cost and scarcity hinder their wide application. As a result, fabricating advanced electrocatalysts from earth-abundant transition metals is essential and urgent in order to meet future energy demands. The development of electrocatalysts based on metal-organic frameworks appears to be very promising due to their unique structure. Over the past few years, ZIF has been considered as a group of metal-organic frameworks with high performance for OER. In this thesis, monometallic, bimetallic, and trimetallic ZIFs, as well as oxide and sulfide compounds derived from them, were synthesized using cobalt, copper, and nickel transition metals. The structure of these materials was evaluated by different methods, including Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Compared to other synthesized electrodes, the electrochemical results show the superiority of the cobalt-copper-nickel sulfide electrode with an overpotential of 210 mV (Vs. reversible hydrogen electrode) to reach a current density of 10 mA.cm-2 for the OER reaction in an alkaline medium. Also, the results of stability tests indicate the long-term stability of this electrocatalyst under an alkaline condition
  9. Keywords:
  10. Water Splitting ; Oxygen Evoloution Reaction (OER) ; Transition Metals ; Metal-Organic Framework ; Hydrogen Producing ; Cobalt-Copper-Nickel Sulfide ; Oxide Compounds ; Zeolite Imidazolate Framework

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