Enhancing EDLC applications with BMIM]BF4-integrated cellulose gel electrolyte for sustainable energy storage
Document Type
Article
Publication Date
1-1-2024
Abstract
Researchers worldwide have extensively carried out the fabrication of supercapacitors using ionic liquid-based gel electrolytes. Gel polymer electrolytes (GPEs) are an excellent alternative electrolyte due to their high ionic conductivity and lack of safety issues associated with solid and liquid polymer electrolytes. This work highlights the performance of a GPE composed of 1-butyl-3-methylimidazolium tetrafluoroborate BMIM]BF4 mixed with ammonium nitrate (NH4NO3) as the charge carrier, entrapped in methylcellulose (MC) for its application as an electrolyte in supercapacitors. The results of the Fourier transform infrared spectroscopy (FTIR) study are in good agreement with the literature, confirming the interaction between the materials observed through the shifting of the hydroxyl band. Moreover, the addition of BMIM]BF4 successfully reduced the degree of crystallinity and crystallite size, thus enhancing the amorphous region of the electrolytes, as observed in the X-ray diffraction (XRD) diffractogram. The sample with 10 wt% BMIM]BF4 (IL10) exhibits the highest ambient conductivity of (2.44 +/- 0.36) x 10-2 S cm-1. The obtained ionic transference number (tion) of 0.98 confirms that ions are the dominant charge carriers. Considering its electrochemically stability up to 2.6 V within a potential range of 3.0 V, the IL10 electrolyte was chosen as a separator for application in an electric double-layer capacitor (EDLC). The EDLC is characterized via cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) analysis.
Keywords
Methylcellulose, Energy storage, 1-butyl-3-methylimidazolium tetrafluoroborate, Supercapacitor, Ionic liquid
Divisions
foundation,CHEMISTRY,PHYSICS
Funders
Malaysian Ministry of Higher Education (MOHE) [FRGS/1/2022/STG05/um/02/9],Magna Value Sdn
Publication Title
Journal of Energy Storage
Volume
75
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS