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Designing Efficient Catalysts for the Electrochemical Reduction Nitrogen to Ammonia

Amiri, Zahra | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58319 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Taherinia, Davood
  7. Abstract:
  8. The global nitrogen cycle has been disrupted by the rapid and increasing anthropogenic emissions of nitrogen-containing pollutants such as nitrates over the past decades, causing several unexpected environmental side effects and threatening human health. The effects of increased nitrate levels in ecosystems lead to adverse health and environmental consequences, such as methemoglobinemia. This has led to an expansion of research into advanced, carbon-free treatment technologies that are capable of removing or valorizing nitrogen wastes from water. The electrocatalytic conversion of nitrate to ammonia is a promising and alternative sustainable approach to improve and modify the nitrogen cycle under mild conditions. Ammonia is considered an excellent hydrogen storage medium, and its synthesis and utilization have received increasing attention. Non-noble metal catalysts show great potential for application in the electrochemical reduction reaction of nitrate due to their high activity, low cost, and good electron transport ability. In this study, Cu2O@Cu-MOF nanocomposite was synthesized using a surface reconstruction method and used as an electrocatalyst. The structure and morphology of the electrocatalyst was investigated by XRD, SEM and TEM tests. The electrocatalytic performance in potassium hydroxide and potassium hydroxide and potassium nitrate solutions was investigated by LSV in the range of 0.8 to -1.5 V. Electrolysis was performed at potentials of -0.4 and -0.6 for one hour. The electrochemical active area was investigated by CV and electrochemical impedance spectroscopy was also performed. The indophenol blue method was used to identify the product. Faradaic Efficiency was 81.39% and the conversion rate was calculated
  9. Keywords:
  10. Electrochemical Reduction ; Nitrate Removal ; Ammonia ; Copper Oxide ; Metal-Organic Framework ; Nanocomposite

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