Symmetrical Composite Supercapacitor Based on Activated Carbon and Cobalt Nanoparticles with High Cyclic Stability and Current Load

Khabibulla A. Abdullin (), Maratbek T. Gabdullin, Zhanar K. Kalkozova, Shyryn T. Nurbolat and Mojtaba Mirzaeian ()
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Khabibulla A. Abdullin: National Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050040, Kazakhstan
Maratbek T. Gabdullin: Kazakh-British Technical University, Almaty 050000, Kazakhstan
Zhanar K. Kalkozova: National Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050040, Kazakhstan
Shyryn T. Nurbolat: National Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050040, Kazakhstan
Mojtaba Mirzaeian: School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK

Energies, 2023, vol. 16, issue 11, 1-19

Abstract: Supercapacitors play an important role in a future clean-energy landscape to meet the challenges of existing energy-storage/delivery systems. They suffer from low energy density and are mainly used for the storage/delivery of electrical energy in high power demands. However, improvement of their energy density is vital to develop energy storage systems that can respond to the energy demands of emerging technologies requiring a wider energy/power spectrum. In this article, a symmetrical capacitor is developed from a composite consisting of synthesized activated carbon and cobalt oxide to improve the energy storage performance of the supercapacitor. Uniform distribution and immobilization of cobalt nanoparticles within the composite is achieved by embedding cobalt acetate into the initial resorcinol formaldehyde polymeric aerogels, followed by the pyrolysis of the gel in Ar atmosphere and activation of the carbon in CO 2 atmosphere at 800 °C. The activated carbon/cobalt composite is used as the electroactive material in electrode formulation. The electrochemical characteristics of the synthesized electrode materials demonstrates an optimized specific capacitance of 235 F g −1 at a sweep rate of 10 mV s −1 in a three-electrode system. The symmetrical capacitor has a capacitance of 66 F g −1 at 1 A g −1 , a very high rate of performance in 10,000 cycle tests, and a rate capability of 24% at 30 A g −1 . The capacitor shows a power density of up to 15 Wh k g −1 . The presence of cobalt spices makes it possible to optimize the capacitance of a symmetrical capacitor, while the capacitance of a symmetrical activated carbon capacitor cannot be optimized.

Keywords: symmetrical supercapacitor; cobalt oxide nanoparticles; activated carbon; electrode material (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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