Abstract
This work presents the fabrication of polymer electrolyte membranes (PEMs) that are made of polyvinyl alcohol-methylcellulose (PVA-MC) doped with various amounts of ammonium iodide (NH4I). The structural and electrical properties of the polymer blend electrolyte were performed via the acquisition of Fourier Transform Infrared (FTIR) and electrical impedance spectroscopy (EIS), respectively. The interaction among the components of the electrolyte was confirmed via the FTIR approach. Electrical impedance spectroscopy (EIS) showed that the whole conductivity of complexes of PVA-MC was increased beyond the addition of NH4I. The application of EEC modeling on experimental data of EIS was helpful to calculate the ion transport parameters and detect the circuit elements of the films. The sample containing 40 wt.% of NH4I salt exhibited maximum ionic conductivity (7.01 × 10−8) S cm−1 at room temperature. The conductivity behaviors were further emphasized from the dielectric study. The dielectric constant, ε’ and loss, ε’’ values were recorded at high values within the low-frequency region. The peak appearance of the dielectric relaxation analysis verified the non-Debye type of relaxation mechanism was clarified via the peak appearance of the dielectric relaxation. For further confirmation, the transference number measurement (TNM) of the PVA-MC-NH4I electrolyte was analyzed in which ions were primarily entities for the charge transfer process. The linear sweep voltammetry (LSV) shows a relatively electrochemically stable electrolyte where the voltage was swept linearly up to 1.6 V. Finally, the sample with maximum conductivity, ion dominance of tion and relatively wide breakdown voltage were found to be 0.88 and 1.6 V, respectively. As the ions are the majority charge carrier, this polymer electrolyte could be considered as a promising candidate to be used in electrochemical energy storage devices for example electrochemical double-layer capacitor (EDLC) device.
Highlights
In the near future, there is predicted to be a rapid increase in the need for energy storage devices like supercapacitors, fuel cells, portable electronics, batteries, sensors, etc.To meet this requirement, an alternative component as a major function of energy storage and energy production has been intensively studied [1–3]
The purpose of this work is to use AC impedance spectroscopy to investigate the conductivity and relaxation mechanisms involved with ion transport
80 wt.% of Poly (vinyl) alcohol (PVA) polymer was dissolved in 30 mL of distilled water (DW) at 80 ◦ C
Summary
There is predicted to be a rapid increase in the need for energy storage devices like supercapacitors, fuel cells, portable electronics, batteries, sensors, etc. To meet this requirement, an alternative component as a major function of energy storage and energy production has been intensively studied [1–3]. Bio-based polymers (BBPs) have increased in popularity as powerful alternatives to conventional polymers as a result of a significant amount of research. This is due to the wide utilization of these materials in electrochemical devices as ways of solving global concerns. These bio-based polymers can be extracted naturally from living organisms [8]
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