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Synthesis, characterization and study of electrochemical applicability of novel asymmetrically substituted 1, 3-dialkyl-1, 2, 3-benzotriazolium salts for supercapacitor fabrication

Publication Type : Journal Article

Publisher : Royal Society of Chemistry

Source : RSC advances Volume 13 Issue 22 Pages 14737-14746, 2023

Url : https://pubs.rsc.org/en/content/articlehtml/2023/ra/d3ra01958f

Campus : Coimbatore

School : School of Physical Sciences

Department : Chemistry

Year : 2023

Abstract : Here we report the successful synthesis, fabrication, and testing of novel asymmetrically substituted 1,3-dialkyl-1,2,3-benzotriazolium-based ionic liquids. Their applicability in energy storage is tested as gel polymer electrolytes (ILGPE) immobilized in poly(vinylidene fluoride-co-hexa-fluoropropylene) (PVDF-HFP) copolymer as a solid-state electrolyte in electric double layer capacitors (EDLC). Asymmetrically substituted 1,3-dialkyl-1,2,3-benzotriazolium salts of tetrafluoroborates (BF4−) and hexafluorophosphates (PF6−) are synthesized by anion exchange metathesis reaction using 1,3-dialkyl-1,2,3-benzotriazolium bromide salts. N-Alkylation followed by quaternization reaction results in dialkyl substitution on 1,2,3-benzotriazole. The synthesized ionic liquids were characterized with 1H-NMR, 13C-NMR, and FTIR spectroscopy. Their electrochemical and thermal properties were studied using cyclic voltammetry, impedance spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The 4.0 V potential windows obtained for asymmetrically substituted 1,3-dialkyl-1,2,3-benzotriazolium salts of BF4− and PF6− are promising electrolytes for energy storage. ILGPE tested with symmetrical EDLC with a wide operating window from 0–6.0 V gave an effective specific capacitance of 8.85 F g−1 at a lower scan rate of 2 mV s−1, the energy density of 2.9 μW h and 11.2 mW g−1 power density. The fabricated supercapacitor was employed for lighting red LED (2 V, 20 mA).

Cite this Research Publication : Anjitha Satheesh, Punnakkal Navaneeth, Punathil Vasu Suneesh, C Sarathchandran, Elango Kandasamy, "Synthesis, characterization and study of electrochemical applicability of novel asymmetrically substituted 1, 3-dialkyl-1, 2, 3-benzotriazolium salts for supercapacitor fabrication", Synthesis, characterization and study of electrochemical applicability of novel asymmetrically substituted 1, 3-dialkyl-1, 2, 3-benzotriazolium salts for supercapacitor fabrication

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