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Design and Fabrication of Core-Shell Electrodes Based on Nickel-Cobalt Layered Double Hydroxides for Energy Production Systems

Kalalipour, Arman | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57867 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza; Naseri, Naimeh
  7. Abstract:
  8. Due to the increasing demand for clean energy, layered double hydroxides (LDHs) have gained attention as electrocatalytic materials for water splitting into hydrogen and oxygen. Nickel-cobalt-based LDHs are favored for their ease of production and environmental compatibility, but they face challenges such as a lack of active sites and structural instability. The use of a core-shell structure can enhance the specific surface area and electroactive sites while preventing structural degradation. Furthermore, this structure can improve electrochemical performance and facilitate the oxygen evolution reaction (OER). In this research, a core-shell structure based on nickel-cobalt was developed, where a spinel oxide Nano flower served as the core and layered double hydroxide as the shell. Subsequently, the shell was doped with iron cations for application in oxygen production via electrocatalytic water splitting. The results showed overpotentials of 386 mV, 511 mV, and 625 mV at current densities of 10 mA/cm², 50 mA/cm², and 100 mA/cm², respectively, with a Tafel slope of 129 mV/decade and retention of 97% of initial performance in stability tests for the designed electrodes on nickel foam substrates. Additionally, initial studies on the iron-doped core-shell structure yielded Tafel slopes of 98 mV/decade and 105 mV/decade, with overpotentials around 405 mV, 528 mV, and 644 mV at similar current densities, indicating promising results for the OER
  9. Keywords:
  10. Water Splitting ; Layered Double Hydroxide (LDH) ; Core-Shell Structure ; Iron Cation Doping ; Spinel Oxide ; Oxygen Evolution Reaction (OER)

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