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Synthesis and Electroatalytic Properties of Fe-CoP@NC/rGO Derived from ZIF-67 for Electrochemical Water Splitting

Amirpoor, Setareh | 2025

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 58266 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. Electrochemical water splitting is a promising strategy for sustainable hydrogen production. This study investigates the development of efficient electrocatalysts for the hydrogen evolution reaction (HER) by leveraging Metal-Organic Frameworks (MOFs). In the first part, we systematically optimized the electrocatalytic activity of ZIF-67 for HER in alkaline media by varying synthesis parameters, including temperature, reaction time, acidity, molar ratio of 2-methylimidazole (2-MIM) to cobalt source, cobalt source type, addition method of 2-MIM, and solvent type. The optimized ZIF-67 electrocatalyst exhibited a low overpotential of 171 mV, a small Tafel slope of 82 mV.dec−1, a low charge transfer resistance of 97 Ω, a high double-layer capacitance of 13.5 mF.cm−2, and high stability for 15 h at 10 mA.cm−2. The enhanced performance was attributed to its high surface area, tunable pore structure, and active cobalt sites. In the second part, we synthesized Fe–CoP@NC/N-rGO hybrid composites derived from ZIF-67 for efficient HER. The influence of microstructures on electrocatalytic activity was systematically investigated. The optimized Fe–CoP@NC/N-rGO composite demonstrated exceptional HER performance with a low overpotential of 84 mV at 10 mA.cm−2, a Tafel slope of 44 mV.dec−1, and excellent stability over 15 h. This composite also exhibited a low charge transfer resistance of 31 Ω and a high double-layer capacitance of 81 mF cm−2. Various characterization techniques, including BET, FESEM, EDS, TEM, XRD, FTIR, UV–vis spectroscopy, Raman spectroscopy, AAS, and XPS, were employed to analyze the morphology, composition, and surface properties of the synthesized electrocatalysts. The remarkable HER performance of the Fe–CoP@NC/N-rGO composite was attributed to the synergistic effects of transition metal doping, phosphorization, reduced graphene oxide (rGO) incorporation, high graphitization degree, and appropriate heteroatom doping. This work highlights the potential of MOF-derived materials for developing high-performance electrocatalysts for sustainable hydrogen production
  9. Keywords:
  10. Electrochemical Water Splitting ; Hydrogen Evolution Reaction ; Metal-Organic Framework ; Hydrogen Producing ; Zeolite Imidazolate Framework ; Zeolitic Imidazolate Framework (ZIF-67) ; Fe-CoP@NC/N-rGO Electrocatalyst

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