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Comparison of the Performance of Nanostructured Metal Oxides and Metal Sulfides as Electrode Active Materials in the Construction of Supercapacitors

Molaei Zarandi, Zeynab | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56946 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Khorasheh, Farhad; Asgharinezhad, Ali Akbar; larimi, Afsaneh Sadat
  7. Abstract:
  8. High-capacity electrode materials are crucial for enhancing the performance of supercapacitors. Transition metal sulfides are considered promising materials for supercapacitor applications due to their high theoretical capacity and good electrical conductivity. Additionally, cerium oxide improves the performance of supercapacitors due to stable reversible oxidation states and greatly supported the faradaic redox reaction. In this study, ceria nanosheets incorporated with MCoS (M=Mn, Zn, Cu) were synthesized successfully through a facile hydrothermal method by sulfidation of MCo LDH/CeO2. The structural and morphological characteristics were analyzed using X-ray diffraction, scanning electron microscope and transmission electron microscope. Among the MCoS/CeO2 electrodes, the MnCoS/CeO2 electrode exhibited superior electrochemical storage properties, with a specific capacity of 772.5 F g-1 at 1 A g-1 (the specific capacitance for ZnCoS/CeO2 and CuCoS/CeO2 is 616.25 F g-1 and 416.25 F g-1) and an excellent cycle life of 89% along with a high coulombic efficiency of over 97.7% after 2500 cycles. Furthermore, the asymmetric supercapacitor assembled with MnCoS/CeO2 as the positive electrode and activated carbon (AC) as the negative electrode demonstrated a high energy density of 24.9 Wh kg-1 at a power density of 407.6 W kg-1. This study highlights the potential of MnCoS/CeO2 for supercapacitor applications
  9. Keywords:
  10. Supercapacitor Electrode ; Layered Double Hydroxide (LDH) ; Specific Capacitance ; Transition Metal Sulfide ; Cerium Oxide

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