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      Microwave-assisted fabrication of high-performance supercapacitors based on electrodes composed of cobalt oxide decorated with reduced graphene oxide and carbon dots

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      Author(s)
      Yetiman, S.
      Peçenek, H.
      Onses, M. Serdar
      Date
      2022-05
      Source Title
      Journal of Energy Storage
      Print ISSN
      2352-152X
      Electronic ISSN
      2352-1538
      Publisher
      Elsevier
      Volume
      49
      Pages
      104103-1 - 104103-11
      Language
      English
      Type
      Article
      Item Usage Stats
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      11
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      Abstract
      This study presents microwave-assisted preparation of cobalt oxide (Co3O4) based nanocomposite electrodes doped with carbon dots and reduced graphene oxide. The calcination of the precursors at 400 °C for 2 h results in nanocomposites. A three-electrode cell in 2M KOH solution is used for the electrochemical measurements. The carbon dot containing electrodes enables the highest specific capacitance of 936 Fg−1 at 0.5 Ag−1 current density. Specific capacitances of pure Co3O4, and Co3O4@RGO electrodes are 448 Fg−1 and 482 Fg−1 at 0.5 Ag−1, with good rate capability even at 10 Ag−1, respectively. The cyclic stability of the electrodes is reasonably high and the electrodes retain 93%, 87%, and 88% of their initial capacitance after 10,000 cycles for Co3O4, Co3O4@RGO, and Co3O4@RGO@CDs, respectively. The optimized Co3O4@RGO@CDs electrodes were used to fabricate a symmetric supercapacitor that exhibits high specific capacitance (126 Fg−1 0.25 Ag−1) and long cycle life (%81 retention after 10,000 cycles). The fabricated supercapacitor has energy density of 17.5 Wh kg−1 and power density of 2522 W kg−1. The outstanding results demonstrate the promise of carbon dots doped transition metal oxides-based nanoparticles as promising electrodes for supercapacitor applications.
      Keywords
      Carbon dots
      Electrochemical studies
      Metal oxide
      Microwave irradiation
      Permalink
      http://hdl.handle.net/11693/111671
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.est.2022.104103
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