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Studying Supercapacitive Performance of Cobalt-based Hierarchical Nanostructures

Afsahi, Nikan | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56170 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Naseri, Naimeh
  7. Abstract:
  8. One of the pillars of reaching a steady development is to utilize sustainable energies. In order to make use of these modern means of energy, appropriate energy storage devices are inevitable. One of the families of these devices is the supercapacitors. Moving toward the 4th industrial revolution, we are encountering modern technologies such as internet of things and wearable electronics. Therefore, designing and fabricating microsupercapacitors is of paramount importance in order to reduce the weight and size of these devices. Cobalt and nickel are considered as two important elements to be used in synthesizing supercapacitive materials and composites, because of their good electrochemical activity, accessibility, and low-cost. Synthesis of Co/Ni-based nano-structures can be beneficial for fabricating desired microsupercapacitors. Moreover, Inkjet-printing technology is a pioneer fabrication technology offering excellent resolution and precision, and low waste. In this research, introducing, designing and synthesizing proper nano-structures is studied which resulted in developing printable inks which was used in fabricating flexible microsupercapacitors. Electrodes built on nickel foam substrate, show high specific capacitances of 1500Fg^(-1) and micro-sized devices show good energy and power densities of 8.64μWh.cm^(-2) and 665μW.cm^(-2), respectively. Furthermore, flexibility assessments show that the devices can retain up to 97% of their initial capacitance following successive mechanical strains such as bends and folds
  9. Keywords:
  10. Microsupercapacitors ; Cobalt Oxide ; Nickel-Cobalt Oxide ; Cobalt Hydroxide ; Inkjet Printing ; Hierarchical Nanostructures

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