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Synthesis, Characterization and Investigation of Electrocatalytic Activity of Nanoparticle/Cerium Oxide Composites in Oxygen Evolution and Reduction Reactions

Moravvej, Heydar | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52929 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry Science
  6. Advisor(s): Taherinia, Davood
  7. Abstract:
  8. The sluggish kinetics of oxygen evolution and reduction on the surface of electrodes is a major problem for the widespread use of devices that are based on sustainable, renewable and clean technologies, such as fuel cells and metal–air batteries. Therefore, the development of efficient and cost–effective materials for the oxygen evolution (OER: Oxygen Evolution Reaction) and reduction reactions (ORR: Oxygen Reduction Reaction) is highly desirable. In recent years, Metal–organic frameworks (MOFs) and their derivatives, have drawn considerable attention as potential catalysts and electrocatalyst due to their high surface area and porous structure. In this study, cerium (IV) oxide was synthesized by calcinating a cerium–based metal–organic framework with 1,3,5–benzene tricarboxylic acid as the linker. The nanocomposite of cerium (IV) oxide and nickel diselenide (NiSe2/CeO2) was prepared by the hydrothermal method. The ratios of the two substances were optimized to reach the highest activity in OER. The structure and morphology of synthesized materials were investigated by the XRD, SEM, and TEM techniques. The NiSe2/CeO2 nanocomposite with a mass ratio of 10:1 showed the best electrocatalytic performance, with a measured overpotential of 208 mV at the current density of 10 mA cm−2 and a Tafel slope of 31.9 mV dec−1 in OER. These numbers are comparable to some of the best electrocatalysts known to date for OER. The electrochemically active surface area (ECSA) and electrochemical properties of the prepared catalysts were also examined by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), respectively
  9. Keywords:
  10. Electrocatalysts ; Metals ; Linear Sweep Voltammetry ; Electrochemical Impedance Spectroscopy ; Nickel Diselenide Hybride Nanocomposite ; Cerium Oxide ; Oxygen Reduction Reaction ; Oxygen Evoloution Reaction (OER) ; Metal-Organic Framework

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