EFFECT OF SILVER ION REDUCTION ON ELECTRICAL MODULUS OF CHITOSAN-SILVER TRIFLATE SOLID POLYMER ELECTROLYTE MEMBRANE

Soran Kamal, Sleman Qadir

Abstract


Utilizing impedance spectroscopy, chitosan-based solid polymer electrolyte containing CF3SO3Ag was investigated for their electric modulus properties. Using the highest conductivity sample, the lowest conductivity relaxation time (τσ) was determined. The high capacitivity of the material is shown by the electrical modulus of the real part. A non-Debye type relaxation is predicted by the asymmetric peak of electric modulus's imaginary part (M").  Utilizing Argand plot, a deformed arc for the relaxation times distribution is demonstrated. Silver nanoparticles formed from silver ions causes a rise in the values of M' and M" above 358 K. The ultraviolet-visible (UV-vis) absorption and complex impedance of silver nanoparticles in chitosan-silver triflate solid electrolyte are temperature dependent. Transmission electron microscopy (TEM) confirmed the silver nanoparticles formation. The dynamical relaxation process for a particular composition is proven by the scaling behavior of M" spectra to be independent of temperature. The conductivity relaxation is shown by a β exponent to be non-exponential.


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DOI: http://dx.doi.org/10.17628/ecb.2019.8.216-223

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