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Ionic Conductivity Study on Hydroxyethyl Cellulose (HEC) doped with NH4Br Based Biopolymer Electrolytes

Author Affiliations

  • 1Advanced Materials Research Group, Renewable Energy Interest Group, Department of Physical Sciences, Faculty of Science and Technology, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, MALAYSIA

Res. J. Recent Sci., Volume 1, Issue (11), Pages 16-21, November,2 (2012)

Abstract

A biopolymer electrolytes (BEs) based on hydroxyethyl cellulose (HEC) doped with NH4Br has been prepared via solution casting technique. XRD shows that all complexes are amorphous. Impedance of the electrolytes has been measured using electrical impedance spectroscopy (EIS) over the frequency range from 50 Hz to 1 MHz. The highest ionic conductivity obtained at room temperature is 3.61 x 10-4 Scm-1 for 25 wt. % of NHBr. The temperature-dependent of HEC based BEs system conductivity data obeys Arrhenius relationship. Conductivity enhancement in the HEC based BEs is caused not only by the increase in the concentration of NH4Br but also by the increase in mobility and diffusion coefficient of ions. Dielectric data were analyzed using complex permittivity ε and complex electrical modulus M for the sample with the highest ionic conductivity at various temperatures.

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