Tuning Reline deep eutectic solvent electrolyte for nickel foam–supported symmetric carbon supercapacitors
Journal of Power Sources, cilt.692, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 692
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.jpowsour.2026.241078
- Dergi Adı: Journal of Power Sources
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Carbon-based electrode, Coin-cell, Deep eutectic solvent, Ethylene glycol, Nickel foam, Reline, Symmetric supercapacitor
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
Özet
Expanding upon the understanding that deep eutectic solvent (DES) properties depend on stoichiometric composition, this work uncovers a pronounced synthesis-path dependency in tuning standard Reline DES with ethylene glycol (EG), demonstrating that sequential and one-pot synthesis routes generate distinct structures and electrochemical behaviors in the resulting ternary DES. Correlation between Vogel–Fulcher–Tammann (VFT) parameters and FTIR analysis provides molecular-level evidence of enhanced ion transport and increased availability of effective charge carriers induced by DES tuning. Symmetric coin-cell supercapacitors based on pure activated carbon electrodes supported on nickel foam current collectors were assembled using the optimized DES electrolyte. Different nickel foam pretreatment methods were further investigated to identify the most effective strategy for improving the electrochemical performance of the developed device. In turn, the best-performing supercapacitor delivered excellent room-temperature charge-storage performance, achieving a maximum cell specific capacitance of 47 F/g at 0.2 A/g, the highest energy density of 26.29 Wh/kg and power density of 2068 W/kg at 2.2 V. Using a stainless-steel substrate enabled a higher operating voltage of 2.5 V while maintaining an energy density of 21.26 Wh/kg and a power density of 2371 W/kg. The assembled supercapacitor also exhibited long-term cycling and reliable operation under moderately elevated temperatures.