Electrochemical Evaluation of Choline Bromide-Based Electrolyte for Hybrid Supercapacitors

IF 3.9 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2024-11-08 DOI:10.3390/en17225580

Zhanibek Ayaganov, Fyodor Malchik, Zhumabay Bakenov, З. А. Мансуров, Kaiyrgali Maldybayev, Andrey Kurbatov, Annie Ng, Vladimir Pavlenko

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引用次数: 1

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.

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混合超级电容器用溴化胆碱电解质的电化学评价

溴化胆碱（ChBr）作为电解质材料的研究较少。这项工作证明了ChBr作为一种新型混合超级电容器的水电解质的巨大潜力。在最佳浓度为3.5 M时，ChBr溶液在室温下的最大电导率为79.56 mS cm−1，粘度为3.15 mPas，密度为1.14 g cm−3。优化后的ChBr电解质浓度降低了水活度，延长了电化学稳定窗口（ESW），使双电极电池的工作电压达到1.9 V。当电流密度从0.5 A g−1增加到5 A g−1时，基于ChBr电解质的杂化超级电容器具有优化的质量比，由商业微孔碳（Maxsorb）组成的电极分别在41 ~ 36 Wh kg−1和330 ~ 300 F g−1（每电极质量）之间表现出令人印象深刻的比能和电容保持。从这项工作中获得的实验结果证明了基于chbr的混合系统在储能装置中的进一步发展和应用的可能性。

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来源期刊

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.