Study on the Immittance Response of Alginate-PVA-(NH4)2SO4 Biopolymer Complexed System for Application in Electrochemical Devices

Abstract

The recent surge in attention focuses on developing biopolymer materials as electrolytes for electrochemical devices due to the growing interest in green energy storage materials. This can bring numerous lucrative prospects and achieve lower costs while being environmentally benign. The work involves preparing a solid blend polymer electrolyte (SBE) system that conducts H⁺ ions. This system is made up of an alginate-poly(vinyl alcohol) (PVA) polymer blend and ammonium sulfate [(NH₄)₂SO₄], and it is created utilizing the solution casting approach. Fourier transform infrared spectroscopy (FTIR) analysis verifies the interaction between polymer-salt complexes through the coordination of polymer blends. The electrical impedance spectroscopy (EIS) technique is employed to study the immittance response properties of the produced SBEs system at ambient temperature. The sample with a composition of 15 wt% of (NH₄)₂SO₄, exhibits the optimum ionic conductivity and is measured at 1.27 × 10⁻⁴ S cm⁻¹. Based on the dielectric analysis, it is evident that the SBEs system follows the trend of ionic conductivity and exhibits non-Debye theory.