Synthesis and characterization of betaine-based natural deep eutectic solvents for electrochemical application

被引：0
作者：
Nowacki, Krzysztof [1 ]
Wysokowski, Marcin [2 ]
Galiński, Maciej [1 ]
机构：
[1] Institute of Chemistry and Technical Electrochemistry, Faculty of Chemical Technology, Poznan University of Technology, Poznan
[2] Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Poznan
来源：
Journal of Molecular Liquids | 2025年 / 424卷
关键词：
Betaine hydrochloride; Electric double-layer capacitor; Liquid electrolyte; NADES; Natural deep eutectic solvent; Supercapacitor;
D O I：
10.1016/j.molliq.2025.127071
中图分类号：
学科分类号：
摘要：
Lately, deep eutectic solvents (DESs) have been taken into detailed consideration as potential electrolytes for use in various electrochemical devices. This study reports a successful synthesis of three novel natural deep eutectic solvents (NADESs) based on betaine hydrochloride as the hydrogen bond acceptor and glycerol, glycolic acid, and ethylene glycol as hydrogen bond donors. Comprehensive research, including ATR-FTIR, surface tension, rheological properties, and ionic conductivity, revealed that the betaine hydrochloride–ethylene glycol (BETCl−:MEG) system exhibited superior physicochemical characteristics. This NADES was subsequently evaluated as an electrolyte in an electric double-layer capacitor (EDLC), demonstrating excellent electrochemical performance with a specific capacitance of 94 F g−1 (0.5 A g−1) and excellent electrochemical stability. Notably, this study represents the first successful application of a betaine hydrochloride-based NADES as a liquid electrolyte in an energy storage device, highlighting its potential as a sustainable alternative to other innovative electrolyte systems, such as deep eutectic solvents based on choline chloride. These findings suggest that betaine-based NADESs hold significant promise for future applications in energy storage technologies. © 2025 Elsevier B.V.
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