Studies of Circuit Design, Structural, Relaxation and Potential Stability of Polymer Blend Electrolyte Membranes Based on PVA:MC Impregnated with NH4I Salt

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.

Preparation and characterization of polymer blend electrolyte membranes based on lithium acetate‐complexed carboxymethyl cellulose (CMC) and carboxymethyl chitosan (CMCh) blend

“…The decrease in electrical resistance along with the increase in lithium salt addition to the solid polymer electrolyte membranes was indicated in several previous studies, such as PVA: MC: NH 4 I electrolyte-based membranes, 58 where the ammonium iodide decreased the electrical resistance of the membrane. Another study reported that the increase in the addition of Mg(NO 3 ) 2 decreases the bulk resistance (R b ) in the pectin-based/Mg (NO 3 ) electrolyte membrane.…”

Substantial Proton Ion Conduction in Methylcellulose/Pectin/Ammonium Chloride Based Solid Nanocomposite Polymer Electrolytes: Effect of ZnO Nanofiller

“…Electrochemical impedance spectroscopy (EIS) has been used extensively in the investigation of electrochemical behaviour and ion transport in a range of ionic materials, including electrodes and SPEs. Using this method, impedance spectra for the SPE films were generated and analyzed [ 44 , 45 ]. All impedance spectra observed in this study showed a prominent spike at low frequency, due to double layer capacitance which existed at the interface of the electrode and the electrolyte sample.…”

“…A closer look at the impedance spectra showed a tiny semicircle at the high frequency region of most of the samples. This was attributed to the bulk resistance (R b ) of the electrolyte samples [ 44 ]. Here, the value of R b was obtained by measuring the point at which the semicircle touched the real impedance axis (Z r ), just before the spike.…”

Innovative Methylcellulose-Polyvinyl Pyrrolidone-Based Solid Polymer Electrolytes Impregnated with Potassium Salt: Ion Conduction and Thermal Properties

“…Changes in peak location imply principally the change in the state of the electron dispersion or hybridization inside the chemical bond. Typically, a reduction in peak intensity indicates a decrease in the number of functional groups linked with the molecular bond (per unit volume) [ 49 , 50 ].…”