Abstract
Over the years, several studies have been conducted to study the optimum composition of a composite electrolyte membrane that can provide efficient electrochemical performance. However, drastic variations in the results have been reported for similar compositions. Herein, we attempt to study the several factors that may contribute to variations in the ionic conductivity of composite electrolyte membranes. With the help of impedance spectroscopy, we have identified frequency and pressure to be two major parameters that vary the conductivity values. For all membranes, conductivity was found to be greatly fluctuating at higher frequencies while the values became stable at a middle frequency of 100 kHz. Finally, a linear relationship was observed between the conductivity values and the pressure applied to the membrane on moving from a pressure of 16 kPa to 40 kPa
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