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Synthesis of Metal-Organic Framework/Graphene Oxide Hybrid as an Efficient Electrode Material in Micro-Supercapacitors

Soroush, Elham | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57166 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Khachatourian, Adrine Malek
  7. Abstract:
  8. The rapid development of portable and wearable electronic devices has necessitated the creation of micro-sized energy storage devices, including micro-supercapacitors. Micro-supercapacitors are ideal energy storage sources for these devices due to their lifetime and optimal power density. Consequently, selecting the appropriate electrode material and developing a simple, low-cost manufacturing method for micro-supercapacitors present significant challenges. Graphene oxide, a key material for these applications, often underperforms due to its porosity and low specific surface area. However, its performance can be enhanced by integrating it with a new class of highly porous materials with a high specific surface area, known as metal-organic frameworks (MOFs). In this study, we employed the electrochemical exfoliation method to synthesize graphene oxide and the solvothermal method for the synthesis of a copper-based metal-organic framework. Subsequently, a hybrid of graphene oxide and the copper-based metal-organic framework was prepared using ultrasonic waves and stirring. This hybrid material was then used to fabricate interdigital in-plane micro-supercapacitors on a PET substrate through a stamping method. X-Ray diffraction analysis (XRD), Fourier Transform Iinfrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analyses were performed to characterize the synthesized materials. Additionally, the electrode performance was evaluated using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) tests. The specific surface area of the hybrid material increased from 36.2 cm-2.g-1 to 130.1 cm-2.g-1 after incorporating 50% by weight of the copper-based metal-organic framework into the graphene oxide due to the synergistic effect of the two components. After the reduction of graphene oxide in the hybrid, the total electrical resistance of the electrode decreased to 20 ohms. Ultimately, a surface capacitance of 5.14 mF.cm-2 was achieved for the hybrid at a scan rate of 5 mV.s-1
  9. Keywords:
  10. Graphene Oxide ; Electrochemical Exfoliation ; Metal-Organic Framework ; Wearable Assistive Device ; Microsupercapacitors ; Stamping

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