Abstract
Two water-soluble and biodegradable polymers: xanthan gum (XG) and poly(vinyl alcohol) (PVA) were used to synthesize ecologically friendly solid polymer electrolyte (SPE) matrices. While XG is a natural polymer, PVA is a synthetic one, but both are colorless and form transparent membranes. To obtain ionic conductivity properties, the samples were doped with acetic acid and characterized by electrochemical impedance spectroscopy (EIS), X-ray diffraction, UV-Vis spectroscopy, and tensile test. The best results of ionic conductivity of 1.97 × 10−4 and 7.41 × 10−4 S/cm at room temperature and 80 °C, respectively, were obtained for the sample containing 55 wt% of acetic acid. Moreover, this electrolyte was found to be predominantly amorphous with transmittance in the visible region of 80% and absorbance values below 0.5 between 240 and 375 nm. Tensile test of this sample, applied up to 18 N of maximum force, resulted in strain of 2322% and Young’s modulus of 0.02 MPa. The obtained results showed that these new eco-friendly materials are promising for use as electrolytes in electrochemical devices.
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The authors are indebted to FAPERGS (grant 12/2239-9) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq; grant 305029/2013-4) for the financial support given to this research.
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Caldeira, I., Lüdtke, A., Tavares, F. et al. Ecologically friendly xanthan gum-PVA matrix for solid polymeric electrolytes. Ionics 24, 413–420 (2018). https://doi.org/10.1007/s11581-017-2223-6
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DOI: https://doi.org/10.1007/s11581-017-2223-6