Publication

Abstract : The goal of this work is to improve the performance of supercapacitors by incorporating hydroquinone (HQ), an organic additive, into triazolium-based ionic liquid (IL) as an electrolyte. To compare the effects of HQ with 1,4-dipropyl-1,2,4-triazolium hexafluorophosphate (1,4-dipropTPF6), electrochemical studies like cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed. 1H NMR spectra were taken for the structural characterisation of the synthesised IL. The development of ionogel polymer using HQ with IL demonstrates the potential use of IL gel polymer electrolyte in the field of energy storage. To assess the potential applicability, two devices were fabricated using IL, and another combined HQ with IL in a 1:50 ratio, employing activated carbon as electrodes. To compare both systems, electrochemical analysis, like GCD, EIS, and CV, was performed. The GCD was tested for both the devices and the calculated power density and energy density for the prototype containing IL gel polymer electrolyte (ILGPE) with 1,4-dipropTPF6 were 437.20 W kg−1 and 2.52 W h kg−1 respectively with 79% cyclic retention even after 1500 cycles and the calculated power density and energy density for the prototype containing ILGPE of HQ:1,4-dipropTPF6 (1:50) were 764.5 W kg−1 and 7.00 W h kg−1 respectively with 82% cyclic retention even after 2000 cycles. The supercapacitor assembled with HQ and 1,4-dipropTPF6 functioned extremely well and improved the supercapacitor’s performance.