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Relaxation process in chitosan–oxalic acid solid polymer electrolytes

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Abstract

We investigate the room temperature frequency dependence of electrical modulus for the polymer electrolytes consisting of chitosan and oxalic acid in the frequency range from 50 Hz to 1 MHz. Oxalic acid serves as the proton provider. It is found that the lowest imaginary electrical modulus is shown by the highest conducting sample OA40, which contains 60 wt.% chitosan and 40 wt.% oxalic acid. The electrical moduli for OA40 sample membrane at different temperatures are also studied, and the peak of the imaginary electrical modulus has been observed to shift towards higher frequency with increasing temperature. This indicates that relaxation is thermally assisted. Analysis of electrical modulus shows that the main relaxation process in chitosan–oxalic acid polymer electrolyte system is a non-Debye process associated with viscoelastic relaxation.

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Acknowledgments

The authors would like to express gratitude to University Malaya for research grant PV059-2012A (PPP Grant) and FP035-2012A. The authors also would like to express heartfelt gratitude to Ms. Leeana Ismail for her assistance in this paper.

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Authors and Affiliations

  1. Centre for Ionics of University of Malaya (CIUM), Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia

    I. A. Fadzallah, S. R. Majid, M. A. Careem & A. K. Arof

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  1. I. A. Fadzallah
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  2. S. R. Majid
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  3. M. A. Careem
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  4. A. K. Arof
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Correspondence to A. K. Arof.

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Fadzallah, I.A., Majid, S.R., Careem, M.A. et al. Relaxation process in chitosan–oxalic acid solid polymer electrolytes. Ionics 20, 969–975 (2014). https://doi.org/10.1007/s11581-013-1058-z

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  • DOI: https://doi.org/10.1007/s11581-013-1058-z

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