Corn Starch/Magnesium Triflate-Based Biopolymer Electrolyte for Electrical Double Layer Capacitor (EDLC) Application

Chong, Yong Er (2023) Corn Starch/Magnesium Triflate-Based Biopolymer Electrolyte for Electrical Double Layer Capacitor (EDLC) Application. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

The preparation of corn starch/magnesium methanesulfonate (MgTf)/1-butyl-3-methylimidazolium chloride (BmImCl) proton conducting solid biopolymer electrolytes is done by solution casting. The maximum ionic conductivity (2.70±0.01) μS cm-1 is achieved at ambient temperature upon adulteration of 35 wt% of BmImCl and obey Arrhenius theory in which the mobile ions within the biopolymer electrolyte move inside the biopolymer backbone through ion hopping mechanism. Ionic liquid-added solid biopolymer electrolyte appear lower glass transition temperature (Tg) than ionic liquid-free solid biopolymer electrolyte which can be proven by differential scanning calorimetry (DSC). Adulteration of ionic liquid narrow the electrochemical potential window but improves the thermal stability of the solid biopolymer electrolyte. The FTIR analysis proves that all the corn starch, MgTf and BmImCl mixed well in the solid biopolymer electrolyte. Activated carbon/carbon black/carbon nanotube electrode is prepared and used in electrochemical double layer capacitors (EDLCs) fabrication. According to the obtained result, the EDLC fabricated with most conducting ionic liquid-added solid biopolymer electrolyte exhibits better electrochemical properties. This EDLC possesses higher specific capacitance than that EDLC fabricated with ionic liquid-free solid biopolymer electrolyte. Based on CV analysis, the calculated specific capacitance is 4.77 F g-1. The obtained result is in good agreement with EIS and GCD findings.