Electrochemical Evaluation of Choline Bromide-Based Electrolyte for Hybrid Supercapacitors

Zhanibek Ayaganov, Fyodor Malchik, Zhumabay Bakenov, Zulkhair Mansurov, Kaiyrgali Maldybayev, Andrey Kurbatov, Annie Ng () and Vladimir Pavlenko ()
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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
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
Kaiyrgali Maldybayev: Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
Andrey Kurbatov: Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, 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

Energies, 2024, vol. 17, issue 22, 1-15

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.

Keywords: choline bromide; hybrid supercapacitor; redox electrolyte; activated carbon (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: 2024
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