Development of Poly(Acrylic Acid)/Aloe Vera-Based Biopolymer Electrolyte for Electrical Double Layer Capacitors (EDLC) Application

Lee, Wey Wen (2024) Development of Poly(Acrylic Acid)/Aloe Vera-Based Biopolymer Electrolyte for Electrical Double Layer Capacitors (EDLC) Application. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

Hydrogel polymer electrolytes comprising of poly(acrylic acid) (PAA)/Aloe vera-lithium trifluoromethanesulfonate are prepared. PAA/Aloe vera hydrogel polymer electrolyte manifests the maximum ion conductivity of 1.60±0.01 mScm-1 while the PAA/Aloe vera-LiTf hydrogel polymer electrolyte with 40 wt.% of LiTf exhibits the maximum ionic conductivity of 8.28±0.01 mScm-1 at ambient temperature. The ion conduction mechanism obeys the Arrhenius theory where the ion migrates along the polymer chain with ion hopping mechanism. The homogenous mixing of PAA, Aloe vera and LiTf was proven by ATR-FTIR analysis. The glass transition temperature of the hydrogel polymer electrolyte increases upon the addition of LiTf which is proven by the analysis result from differential scanning calorimetry. The addition of salt slightly increases the electrochemical properties of hydrogel polymer electrolytes in term of working potential window. The electrical double layer capacitors (EDLC) cell is fabricated using the highest conducting hydrogel polymer electrolyte. The addition of LiTf had shown to enhance the electrochemical performance of EDLC cell, proving by the increase of specific capacitance from 1.698 Fg-1 to 3.437 Fg-1 in cyclic voltammetry studies and tally with the result from GCD.