Electrical conductivity studies on plasticized peo-based proton conducting electrolytes / Shafeeza Mohamad Zon

In this study, PEO (polyethylene oxide) containing different weight percent of ammonium nitrate (NH4NO3) salt were prepared by using solution casting technique. Impedance spectroscopy (IS) technique was carried out to determine the electrical conductivity of the samples. The highest value of electrical conductivity for the optimum weight percent salt of the sample was determined. The highest conductivity for PEO + 5wt% NH4NO3 was 1.18 x 10"6 Scm"1. This conductivity was computed using the bulk resistance value which can be retrieved from the complex impedance plot in frequency range between 100Hz and 1MHz. Polyethylene glycol (PEG6oo)> used as plasticizer has been added in different weight percent to PEO- NH4NO3 film. Plasticizer was used to enhance the conductivity of the sample by assisting the rate of ion dissociation. The conductivity of the highest conducting sample of plasticized PEO + 5wt% NH4NO3 at room temperature was 4.56 x 10'5 S cm"1. The Impedance spectroscopy technique was repeated in for temperature-dependence conductivity using the highest conducting plasticized sample. The highest conductivity of the plasticized PEO + 5wt% NH4NO3 obtained was 1.37 x 10'3 Scm"1, measured at 333K.