Thermal, electrical and optical studies on the poly(vinyl alcohol) based polymer electrolytes

G. Hirankumar, S. Selvasekarapandian, Naoaki Kuwata, J. Kawamura, T. Hattori

Research output: Contribution to journalArticlepeer-review

140 Citations (Scopus)

Abstract

Solid polymer proton conductors comprising of poly(vinyl alcohol), ammonium acetate and water have been prepared by solution cast method for different NH4+/OH- ratios. The XRD spectra for the electrolyte indicate that the amorphous nature of PVA increases with the concentration of ammonium acetate. The DSC curves show the low glass transition temperature for the ratio (NH4+/OH-) = 0.25 which relates to higher conductivity of the sample. The ionic conductivity at room temperature depends strongly on NH4+/OH- ratios. The variation of electrical conductivity with temperature showed two regions of activation above and below glass transition temperature. The optical absorption studies show the similar trend for pure PVA and salt-doped PVA with different absorption intensity. The direct and indirect band gap energy is observed to be constant for pure PVA and salt-doped PVA samples and found to be 5.4 eV and 4.8 eV, respectively. The dc polarization measurement shows that the conductivity is mainly due to ions.

Original languageEnglish
Pages (from-to)262-267
Number of pages6
JournalJournal of Power Sources
Volume144
Issue number1
DOIs
Publication statusPublished - 2005 Jun 1

Keywords

  • Conductivity analysis
  • Differential scanning calorimetry
  • Optical absorption
  • Poly(vinyl alcohol)
  • Proton conductor
  • Transport number

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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