Structural, Morphological, Electrical and Electrochemical Properties of PVA: CS-Based Proton-Conducting Polymer Blend Electrolytes

Abstract

Polymer blend electrolytes based on poly(vinyl alcohol):chitosan (PVA:CS) incorporated with various quantities of ammonium iodide were prepared and characterized using a range of electrochemical, structural and microscopic techniques. In the structural analysis, X-ray diffraction (XRD) was used to confirm the buildup of the amorphous phase. To reveal the effect of dopant addition on structural changes, field-emission scanning electron microscope (FESEM) was used. The protrusions of salt aggregates with large quantity were seen at the surface of the formed films at 50 wt.% of the added salt. The nature of the relationship between conductivity and dielectric properties was shown using electrochemical impedance spectroscopy (EIS). The EIS spectra were fitted with electrical equivalent circuits (EECs). It was observed that both dielectric constant and dielectric loss were high in the low-frequency region. For all samples, loss tangent and electric modulus plots were analyzed to become familiar with the relaxation behavior. Linear sweep voltammetry (LSV) and transference number measurement (TNM) were recorded. A relatively high cut-off potential for the polymer electrolyte was obtained at 1.33 V and both values of the transference number for ion (tion) and electronic (telec) showed the ion dominant as charge carrier species. The TNM and LSV measurements indicate the suitability of the samples for energy storage application if their conductivity can be more enhanced.

Characterization of proton conducting poly[ethylene oxide]: Poly[vinyl pyrrolidone] based polymer blend electrolytes for electrochemical devices

“…There are many earlier studies reported for ionic and electronic transference number measurements. 39 –46…”

Structural, Impedance and Electrochemical Characteristics of Electrical Double Layer Capacitor Devices Based on Chitosan: Dextran Biopolymer Blend Electrolytes

“…Obviously, the current decays with time proceeding is resulting from the SS electrode blocking by ions where it becomes constant at 0.2 µA. This constant current for a period of time is known as steady-state current where there is a polarization of the electrodes [70]. To take advantage of this state, calculation of t ion and t el values is easy to perform using the aforementioned Equations (1) and (2).…”

Electrical, Dielectric Property and Electrochemical Performances of Plasticized Silver Ion-Conducting Chitosan-Based Polymer Nanocomposites

“…Ion transport mechanism and its contribution to DC conductivity is a complicated topic in the systems of polymer-salt electrolytes [23]. The absence of a dielectric relaxation peak in the diagram of dielectric loss is because of the polymer relaxation segment mask with DC conductivity of ions [19,23,24]. In systems of PE with large electrical conductivity polarization, relaxation of mobile carriers might cover the peaks due to induced dipoles or permanent dipoles; thus, the low frequency relaxation peaks cannot be seen [25].…”