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Int. J. Electroactive Mater. 3 (2015) 20-27

Proton Conducting Polymer Electrolyte based on Poly (N-vinyl pyrrolidone) Doped with Ammonium Iodide

Vijaya Naranappa1, Selvasekarapandian Subramanian2*, Nithya Hellar3, Sanjeeviraja Chinnappa Nadar4

1Physics, S.F.R. College for Women, Sivakasi, Tamil Nadu, India
2Institute, Materials Research Center, Coimbatore, Tamil Nadu, India
3Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai, Miyagi , Japan
4Physics, Alagappa Chettiar College of Engineering and Technology, Karaikudi, Tamil Nadu, India

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Abstract : The present work deals with the characterization of a proton conducting polymer electrolyte based on Poly (N-vinyl pyrrolidne) (PVP)-Ammonium iodide (NH4I) prepared by solution casting technique. X-ray diffraction pattern confirms the amorphous nature of the PVP-NH4I polymer electrolyte. Fourier transform infrared analysis reveals the complexation behaviour of the polymer PVP with NH4I. The glass transition temperature (Tg) of the electrolyte with 70 mol% PVP:30 mol% NH4I has been found to be 343 K from differential scanning calorimetry thermograms. The highest ambient temperature conductivity is 1.78×10-5 S cm-1 for the film containing 30 mol% NH4I. Temperature dependent conductivity follows Arrhenius behaviour. A high dielectric constant has been obtained for the highest conducting film. The loss tangent spectra analysis shows that the electrolyte with 30 mol% NH4I has low relaxation time. Ionic transference number measurements reveal that the conducting species are predominantly ions.

Keywords : solid electrolytes,differential scanning calorimetry,dielectric permittivity,ionic conductivity,fourier transform infrared spectroscopy ,