Electrical impedance spectroscopy (EIS) is an appropriate technique for learning a material’s electrical property, and has been used in electrochemical energy storage devices [46 (link)]. It gives vital evidence about the electrical properties at the interfacial space among electronically conducting electrodes and electrolytes. Before impedance measurements, the electrolyte films were cut into small discs of 2 cm in diameter and then positioned between two stainless steel electrodes via spring pressure. The impedance measurements were performed via HIOKI 3531 Z Hi-tester (Hioki, Nagano, Japan) with a computer in the frequency range between 50 Hz and 5000 kHz at room temperature. Software extracted both real (Z′) and imaginary (Z″) parts of the impedance spectra of the EIS plots. From the plot’s intersection with the real axis, the bulk resistance (Rb) was obtained. From the Rb, the conductivity of the films was measured using Equation (2) [46 (link)]:
where t is the thickness of the film and A is the area of the electrode.
where t is the thickness of the film and A is the area of the electrode.
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