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Synthesis and Characterization of Graphene-based Cathode Performance for Lithium Battery

Ghorbani, Younes | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54560 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. The air cathode of li-air batteries plays a pivotal role in the overall performance of Li-air batteries. Graphene-based cathodes have been investigated as cathode catalysts for lithium-air batteries due to their extraordinary potential for accelerating and facilitating oxygen reduction reaction (ORR).In this study graphene oxide have been synthesized via modified Hummers’ method. Consequently, the as obtained graphene oxide have been reduced using chemical, electrochemical, and hydrothermal methods. Results of elechtrochemical evaluations demonstrate that the graphene oxide reduced via hydrothermal method possesses the most positive ORR onset potential (+0.55V vs SHE) among the other samples (+0.25 and +0.51V vs SHE for chemically and electrochemically reduced graphene oxide, respetively). In addition, hydrothermally reduced sample has considerably larger cathodic current density (-4.72 mA⁄cm^2 ) in comparison with other samples (-2.78 and -1.54 mA⁄cm^2 for chemically and electrochemically reduced graphene oxide, respetively). According to electrochemical measurement results, sample reduced via hydrothermal method has the highest catalytic activity among the other reduction methods toward ORR
  9. Keywords:
  10. Lithium-air Batteries ; Reduced Graphene Oxide ; Oxygen Reduction Reaction ; Electrocatalytic Activity ; Graphene-Based Cathode ; Hydrothermal Method

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