Jagadish Naik

Proton conducting solid polymer electrolyte films, which are composed of diazanium hydrogen phosphate (DAHP) and poly(vinyl alcohol) (PVA), were prepared by a solution casting method. The prepared films were characterized by ultraviolet-visible, X-ray diffraction, and differential scanning calorimetry. The optical activation energy and band gap increases with increase in DAHP content in PVA. The direct current (DC) and alternating current (AC) conductivity studies have been carried out using an impedance analyzer. The sample containing 15 wt% DAHP shows highest AC conductivity of the order of 10⁻⁴ S cm⁻¹ and DC conductivity about 4.27 × 10⁻⁷ S cm⁻¹ at ambient conditions. The crystallinity has decreased and glass transition temperature ( T _g) has increased with increase in DAHP content. The Williams–Landel–Ferry and Vogel–Fulcher–Tamman equations were used to calculate dynamic fragility ( m) and apparent activation energy ( E _g) from T _g values. The Rice and Roth model was successfully applied to determine the transport parameters for DAHP/PVA electrolytes. This article mainly focused on understanding the contribution of different parameters to conductivity phenomenon in solid polymer electrolytes.

Thermally sensitive, ceria based proton conducting solid polymer electrolyte films were prepared by doping ammonium ceric sulfate complex salt in a PVA matrix using solution casting method. The prepared films were characterized using FTIR, FESEM, TGA, UTM and impedance analyzer in order to understand structural, morphological, thermal, mechanical and electrical properties CeO2 nanoparticle based PVA/ACS composites. The presence of spindle shaped CeO2 nanoparticle was confirmed from FESEM micrographs. The prepared films shown good thermal stability up to 200 oC. The 15 wt.% ACS doped PVA electrolyte shown good conductivity, mechanical strength and thermal stability. The Rice and Roth model have been used to evaluate transport parameters and it reveals that enhancement in conductivity is due to increment in the number density of mobile ions as the increase in salt concentration.