Improvement of proton-exchange membranes based on (1-x)(H3PO2/PVA)-xTiO2
Main Article Content
Keywords
Composite polymer membranes, PVA, Hypophosphorous acid, Proton conduction, DC conductivity
Abstract
Using impedance spectroscopy (IS), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and infrared spectroscopy (IR) techniques to study the polymer electrolyte membranes based on poly(vinyl alcohol) (PVA) and hypophosphorous acid (H3 PO2) with different titanium oxide nanoparticles (TiO$_2$) concentrations. The polymer systems (1-x)(H3 PO2/ PVA) + xTiO2 were prepared using the sol-casting method and different weight percent of TiO2, x≤ 10.0%. The DSC results show that the glass transition for molar fraction P/OH = 0.3 appears around 75°C and for the samples doped with TiO2 around 35°C the melting point for all membranes appear around 175°C. The FTIR spectra show changes in the profiles of the absorption bands with the addition of H3 PO2 and the different concentrations of TiO2. The IS results show dielectric and conductivity relaxations as well as a change in DC ionic conductivity with the TiO$_2$ content. The order of the ionic conductivity is about 10-2 S/cm for 5.0% of TiO2. The TGA in the heating run shows water loss that is in agreement with de DC conductivity measurements.
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References
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[8] M. Vargas, R. Vargas, and B.-E. Mellander, “More studies on the PVAl+H3PO2 + H2O proton conductor gels,” Electrochimical Acta, vol. 45, pp. 1 399–1 403, 2000.
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[13] C. Yang, “Synthesis and characterization of the cross-linked PVA/TiO2 composite polymer membrane for alkaline DMFC,” Electrochimical Acta, vol. 288, pp. 51–60, 2007.
[14] M. Fernández, J. Diosa, R. Vargas, J. Guerra, C. Villaquiran, D. García, and J. Eiras, “Influence of TiO2 Nanoparticles on the Morphological, Thermal and Solution Properties of PVA/TiO2 Nanocomposite Membranes,” Phys. Stat. Sol. (c), vol. 4, pp. 4075–4080, 2007.
[15] P. Ahmadpoor, A. Nateri, and V. Motaghitalab, “The Optical Properties of PVA/TiO2 Composite Nanofibers,” J. Applied Polymer Science, vol. 130, pp.78–85, 2013.
[16] J. Ahmad, K. Deshmukh, M. Habib, and M. Hägg, “Influence of TiO2 Nanoparticles on the Morphological, Thermal and Solution Properties of PVA/TiO2 Nanocomposite Membranes,” J. Sci. Eng., vol. 39, pp. 6805–6814, 2014.
[17] A. Jonscher, Universal relaxation law: a sequel to Dielectric relaxation in solids. Chelsea Dielectrics Press, 1996.
[18] G. Casalbore-Miceli, M. Yang, M. Camaioni, C.-M. Mari, Y. Li, M. Sun, and H. Ling, “Investigations on the ion transport mechanism in conducting polymer films,” Sol. Stat. Ionics, vol. 131, pp. 6 805–6 814, 2000.