Ion Transport Study in Corn Starch-NaHSO3 Based Polymer Electrolytes

Abstract

In this work, different amounts of sodium bisulfite, NaHSO₃ (5wt.% to 40wt.%), were dissolved in a corn starch polymer host to synthesize solid polymer electrolyte (SPE) using a solution casting technique. Then, the films prepared were characterised using non-destructive electrical impedance spectroscopy to determine SPE films' conductivity and electrical transport properties. The highest conductivity of the sample at ambient temperature was recorded at 15wt. % of NaHSO₃ with a value of 2.22 × 10^-4 Scm^-1. Moreover, the ion transport parameters at room temperature are found to be 2.41 × 10^-7 cm²s^-1, 9.39 × 10^-6 cm²V^-1s^-1, 1.70 × 1019 cm^-3 for D, µ and n, respectively. The conductivity of the samples was found dependent on diffusion coefficient, D and mobility, µ of ions.