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Synthesis, Characterization, and Investigation of the Electrocatalytic Activity of Non-Precious Metal-Based Compounds Toward the Electrochemical Reduction of Carbon Dioxide

Farahmand, Danial | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57350 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Taherinia, Davood
  7. Abstract:
  8. Emissions of carbon dioxide (CO2) from fossil fuels are a potential issue for the global climate. One way to address this challenge is to electrochemically convert CO2 molecules into carbon-reduced species such as alcohols, hydrocarbons, formates and other valuable products, which is a difficult process due to the slow kinetics of CO2 reduction. Therefore, the use of proper electrocatalyst while preventing undesirable adverse reactions can play an important role in the electrochemical reduction of CO2. In this study, synthesis of bimetallic Bi2O3@CuS composite as an advanced electrocatalyst for CO2 reduction in neutral pH environments has been investigated and reported. Bismuth oxide has been used to improve the electrocatalytic properties and selectivity in the production of selected products. Bimetallic Bi2O3@CuS composite was fabricated using a simple hydrothermal method in aqueous solution in four weight ratios. The structure and morphology of the materials were investigated using X-ray diffraction (XRD) techniques, field emission scanning electron microscopy (FE-SEM) and Energy-dispersive X-ray spectroscopy (EDS). The activity of four weight ratios of electrocatalyst Bi2O3@CuS in electrochemical reaction was also investigated using linear scanning voltammetry (LSV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In this research, the new Bi2O3@CuS electrocatalyst with a high current density of -200 mA/cm2 in addition to low potential is -0.8 compared to RHE, and tafel slope of 174 mV/dec. The electrocatalysts made at four weight ratios were also used as bi-functional electrocatalyst in water splitting process in order to produce oxygen gas. Activity of these elctrocatalysts were investigated and the most efficient catalyst was able to perform the oxygen evolution reaction at overpotential of 289 mV compared to RHE and the tafel slope of 178 mV/dec at a current density of 30 mA/cm2
  9. Keywords:
  10. Carbon Dioxide Electrochemical Reduction ; Electrocatalysts ; Oxygen Evolution ; Cyclic Voltammetry ; Electrochemical Impedance Spectroscopy ; Linear Sweep Voltammetry ; Non-Precious Metals ; Electrochemical Water Splitting

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