Influence of scan rate on CV Pattern: Electrical and electrochemical properties of plasticized Methylcellulose: Dextran (MC:Dex) proton conducting polymer electrolytes

Solid polymer electrolytes containing methylcellulose:dextran (MC-DEX), ammonium hexafluorophosphate (NH4PF6), and glycerol have been prepared via the solution cast method. Various techniques have been used to characterize the prepared electrolyte samples. Fourier transform infrared spectroscopy (FTIR) analysis revealed the interaction between polymers and elec trolyte components. According to the electrical impedance spectroscopy (EIS), the highest conduct-ing plasticized system achieves a conductivity of 6.71 x 10(-4) S cm(-1) at ambient temperature. The mobility, number density, and diffusion coefficient of ions were measured using both FTIR and EIS methods, and it was found that their values rise as the amount of glycerol increases. Polariza-tion due to ion migration is responsible for the high value of dielectric parameters. According to transference number measurement (TNM), the transportion (t(ion)) is 0.92, verifying that the ions are the primary charge carriers. The electrochemical stability window of the maximum conducting plasticized system is 1.58 V, based on linear sweep voltammetry (LSV) analysis. The electrical double-layer capacitor (EDLC) device is fabricated using the highest conducting plasticized system. The cyclic voltammetry (CV) curve is roughly rectangular in shape and with no presence of Fara-daic peaks with its specific capacitance of 32.69F/g at 10 mV/s. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University.

Automated summary

Solid polymer electrolytes containing methylcellulose:dextran, ammonium hexafluorophosphate, and glycerol were prepared and characterized. The results showed that the mobility, number density, and diffusion coefficient of ions increased with the increase of glycerol content. The electrochemical stability window analysis indicated good stability of the highest conducting plasticized system.