Open AccessConduction Mechanism of Chitosan/Methylcellulose/1-Butyl-3 Methyl Imidazolium Bis (Trifluoromethylsulfonyl) Imide (BMIMTFSI) Biopolymer Electrolyte Doped with Ammonium Triflate
Author(s) -
Muhammad Syukri Mohamad Misenan,
A.S.A. Khiar
Publication year - 2020
Publication title -
malaysian journal of chemistry/malaysian journal of chemistry
Language(s) - English
Resource type - Journals
eISSN - 2550-1658
pISSN - 1511-2292
DOI - 10.55373/mjchem.v22i4.781
Subject(s) - conductivity , trifluoromethanesulfonate , ionic conductivity , crystallinity , fourier transform infrared spectroscopy , electrolyte , materials science , analytical chemistry (journal) , imide , chemistry , inorganic chemistry , polymer chemistry , chemical engineering , organic chemistry , composite material , electrode , engineering , catalysis
Chitosan/methylcellulose/1-butyl-3 methyl imidazolium bis (trifluoromethylsulfonyl) imide (BMIMTFSI) biopolymer electrolyte has been prepared via solution casting technique by doping with different weight percentages of ammonium triflate (NH4CF3SO3) salt. The films were characterized by impedance spectroscopy to measure the ionic conductivity. Samples with 25 wt.% of NH4CF3SO3 exhibited the highest conductivity of 7.64 × 10-4 S cm-1 at ambient. Dielectric data showed that the increase in conductivity could be due to the increase in the number of charge carriers, while modulus study confirmed the non-Debye behaviour. Temperature dependence study showed that the polymer electrolyte system obeyed the Arrhenius rule. Conduction mechanism analysis showed that this system matched the Quantum Mechanical Tunnelling (QMT) behaviour. X-ray Diffraction (XRD) spectra, which had been deconvoluted using Origin 8 software disclosed that samples with the lowest degree of crystallinity (Xc %) obtained the highest ionic conductivity. On the other hand, Fourier Transform Infrared (FTIR) spectra, which were also deconvoluted using the same software showed that samples with the highest ionic conductivity had the highest number of mobile ions in this system.