Investigation of Electrocatalytic Activity of Metal-based Nanocomposites in the Reaction of Carbon Dioxide Reduction

Hatami, Homayoun | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55273 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Darioush; Taherinia, Davood
  7. Abstract:
  8. Emissions of carbon dioxide (CO2) from fossil fuels are a potential issue for the global climate. One way to meet this challenge is to electrochemically convert CO2 molecules to reduced carbon species such as formates, alcohols, hydrocarbons, etc., which is a difficult process due to the poor kinetics of CO2 reduction. Therefore, the use of catalysts, while preventing undesirable side reactions, can also play an important role in reducing CO2. In this study, a two-step synthesis of CuS (1, 5, 12, 24 hr) @ Cu-MOF has been reported as an advanced electrocatalyst for CO2 reduction in neutral pH environments. Bismuth has been used to improve the electrocatalytic properties of the samples. Bi-CuS (24 hr) @ Cu-MOF was synthesized using a simple hydrothermal method. The structure and morphology of synthesized materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS) techniques .The activity of the catalysts in the reaction is also investigated using linear voltammetry (LSV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In this study, the new Bi-CuS (24 hr) @ Cu-MOF catalyst was reported to have a high current density of -300 mA.cm-2 in addition to a low potential of -0.67 V relative to RHE, and a tafel slope of 58 mV.decade-1 achieves.
  9. Keywords:
  10. Electrocatalysts ; Overpotential ; Linear Sweep Voltammetry ; Cyclic Voltammetry ; Electrochemical Impedance Spectroscopy ; Carbon Dioxide Electrochemical Reduction ; Carbon Dioxide Emission

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