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Electrochemical Evaluation of Choline Bromide-Based Electrolyte for Hybrid Supercapacitors

Author

Listed:
  • Zhanibek Ayaganov

    (Laboratory of Functional Nanomaterials, The Institute of Combustion Problems, Almaty 050009, Kazakhstan)

  • Fyodor Malchik

    (Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
    Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan)

  • Zhumabay Bakenov

    (Department of Chemical and Materials Engineering, Nazarbayev University, Astana 010000, Kazakhstan)

  • Zulkhair Mansurov

    (Laboratory of Functional Nanomaterials, The Institute of Combustion Problems, Almaty 050009, Kazakhstan
    Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan)

  • Kaiyrgali Maldybayev

    (Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
    Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan)

  • Andrey Kurbatov

    (Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
    Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty 050012, Kazakhstan)

  • Annie Ng

    (Department of Electrical and Computer Engineering, Nazarbayev University, Astana 010000, Kazakhstan)

  • Vladimir Pavlenko

    (Laboratory of Functional Nanomaterials, The Institute of Combustion Problems, Almaty 050009, Kazakhstan
    Department of Electrical and Computer Engineering, Nazarbayev University, Astana 010000, Kazakhstan)

Abstract

Choline bromide (ChBr) has been less explored as an electrolyte material. This work demonstrates the promising potential of ChBr as a novel aqueous electrolyte for hybrid supercapacitors. At its optimized concentration of 3.5 M, ChBr solution exhibits a maximum conductivity of 79.56 mS cm −1 at room temperature, along with a viscosity of 3.15 mPas and a density of 1.14 g cm −3 . A reduction in water activity of the optimized ChBr electrolyte concentration extends the electrochemical stability window (ESW), enabling operation up to 1.9 V for two-electrode cells. When the current densities increase from 0.5 to 5 A g −1 , the hybrid supercapacitor based on ChBr electrolyte with the optimized mass ratio of electrodes composed of commercial microporous carbon (Maxsorb) demonstrates impressive specific energy and capacitance retention from 41 to 36 Wh kg −1 and from 330 to 300 F g −1 (per mass of one electrode), respectively. The experimental results obtained from this work demonstrate possibilities for further development and applications of ChBr-based hybrid systems in energy storage devices.

Suggested Citation

  • Zhanibek Ayaganov & Fyodor Malchik & Zhumabay Bakenov & Zulkhair Mansurov & Kaiyrgali Maldybayev & Andrey Kurbatov & Annie Ng & Vladimir Pavlenko, 2024. "Electrochemical Evaluation of Choline Bromide-Based Electrolyte for Hybrid Supercapacitors," Energies, MDPI, vol. 17(22), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:22:p:5580-:d:1516853
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