scholarly journals The Study of Plasticized Sodium Ion Conducting Polymer Blend Electrolyte Membranes Based on Chitosan/Dextran Biopolymers: Ion Transport, Structural, Morphological and Potential Stability

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 383
Author(s):  
Ahmad S.F.M. Asnawi ◽  
Shujahadeen B. Aziz ◽  
Iver Brevik ◽  
Mohamad A. Brza ◽  
Yuhanees M. Yusof ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Ionic Conductivity ◽  
Electrical Impedance Spectroscopy ◽  
Degree Of Crystallinity ◽  
Transference Numbers ◽  
Transport Parameters ◽  
Electrolyte System ◽  
Energy Storage Devices ◽  
Mobility Of Ions ◽  
Ion Conducting

The polymer electrolyte system of chitosan/dextran-NaTf with various glycerol concentrations is prepared in this study. The electrical impedance spectroscopy (EIS) study shows that the addition of glycerol increases the ionic conductivity of the electrolyte at room temperature. The highest conducting plasticized electrolyte shows the maximum DC ionic conductivity of 6.10 × 10−5 S/cm. Field emission scanning electron microscopy (FESEM) is used to investigate the effect of plasticizer on film morphology. The interaction between the electrolyte components is confirmed from the existence of the O–H, C–H, carboxamide, and amine groups. The XRD study is used to determine the degree of crystallinity. The transport parameters of number density (n), ionic mobility (µ), and diffusion coefficient (D) of ions are determined using the percentage of free ions, due to the asymmetric vibration (υas(SO3)) and symmetric vibration (υs(SO3)) bands. The dielectric property and relaxation time are proved the non-Debye behavior of the electrolyte system. This behavior model is further verified by the existence of the incomplete semicircle arc from the Argand plot. Transference numbers of ion (tion) and electron (te) for the highest conducting plasticized electrolyte are identified to be 0.988 and 0.012, respectively, confirming that the ions are the dominant charge carriers. The tion value are used to further examine the contribution of ions in the values of the diffusion coefficient and mobility of ions. Linear sweep voltammetry (LSV) shows the potential window for the electrolyte is 2.55 V, indicating it to be a promising electrolyte for application in electrochemical energy storage devices.

Electronic/Ionic Conductivity and Oxygen Diffusion Coefficient af the Sr-Fe-Co-O System

1995 ◽  
Vol 393 ◽  
Author(s):  
B. Ma ◽  
J.-H. Park ◽  
C. U. Segre ◽  
U. Balachandran
Keyword(s):  
Diffusion Coefficient ◽  
Ionic Conductivity ◽  
Oxygen Diffusion ◽  
Ionic Conductivities ◽  
Transference Number ◽  
Transference Numbers ◽  
Oxygen Diffusion Coefficient ◽  
Ionic Transference Number ◽  
Local Fitting ◽  
Oxide Ion

ABSTRACTOxides in the Sr-Fe-Co-O system exhibit both electronic and ionic conductivities. Recently, the Sr-Fe-Co-O system attracted great attention because of its potential to be used for oxygen-permeable membranes that can operate without electrodes or external electrical circuitry. Electronic and ionic conductivities of two compositions of the Sr-Fe-Co-O system, named SFC-1 and SFC-2, have been measured at various temperatures. The electronic transference number is much greater than the ionic transference number in SFC-1, whereas the electronic and ionic transference numbers are very similar in SFC-2. At 800°C, the electronic and ionic conductivities are ≈76 and ≈4 S•cm−1, respectively, for SFC-1; whereas, for SFC-2, the electronic and ionic conductivities are ≈10 and ∼1 S•cm−1, respectively. By performing a local fitting to the equation σ • T = Aexp(-Ea / kT), we found that the oxide ion activation energies are 0.92 and 0.37 eV, respectively, for SFC-1 and SFC-2. The oxygen diffusion coefficient of SFC-2 is ≈ 9 x 10−7cm2/sec at 900°C.

scholarly journals Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 170
Author(s):  
Balen K. Faris ◽  
Ary A. Hassan ◽  
Shujahadeen B. Aziz ◽  
Mohamad A. Brza ◽  
Aziz M. Abdullah ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Structural Changes ◽  
Dc Conductivity ◽  
Solid Polymer Electrolytes ◽  
Electrical Impedance Spectroscopy ◽  
Solid Polymer ◽  
Electrolyte System ◽  
Electrical Equivalent Circuit ◽  
Spectra Analysis ◽  
Ion Conducting

The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at the XRD pattern at 40 and 50 wt.% of NaBr salt. The electrical impedance spectroscopy (EIS) study illustrates that the loading of NaBr increases the electrolyte conductivity at room temperature. The DC conductivity of 6.71 × 10−6 S/cm is obtained for the highest conducting electrolyte. The EIS data are fitted with the electrical equivalent circuit (EEC) to determine the impedance parameters of each film. The EEC modeling helps determine the circuit elements, which is decisive from the engineering perspective. The DC conductivity tendency is further established by dielectric analysis. The EIS spectra analysis shows a decrease in bulk resistance, demonstrating free ion carriers and conductivity boost. The dielectric property and relaxation time confirmed the non-Debye behavior of the electrolyte system. An incomplete semicircle further confirms this behavior model in the Argand plot. The distribution of relaxation times is related to the presence of conducting ions in an amorphous structure. Dielectric properties are improved with the addition of NaBr salt. A high value of a dielectric constant is seen at the low frequency region.

scholarly journals Solid-State EDLC Device Based on Magnesium Ion-Conducting Biopolymer Composite Membrane Electrolytes: Impedance, Circuit Modeling, Dielectric Properties and Electrochemical Characteristics

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 389
Author(s):  
Ahmad S. F. M. Asnawi ◽  
Shujahadeen B. Aziz ◽  
Salah R. Saeed ◽  
Yuhanees M. Yusof ◽  
Rebar T. Abdulwahid ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Internal Resistance ◽  
Circuit Modeling ◽  
Electrochemical Characteristics ◽  
Transport Parameters ◽  
Double Layer Capacitor ◽  
Electrochemical Double Layer ◽  
Ion Conducting ◽  
Discharge Profile

The polymer electrolyte based on Dx:Cs:Mg(CH3COO)2:Ni with three different glycerol concentrations have been prepared. The impedance study has verified that the electrolyte with 42 wt.% of glycerol (A3) has the highest ionic conductivity of 7.71 × 10−6 S cm−1 at room temperature. The ionic conductivity is found to be influenced by the transport parameters. From the dielectric analysis, it was shown that the electrolytes in this system obeyed the non-Debye behavior. The A3 electrolyte exhibited a dominancy of ions (tion > te) with a breakdown voltage of 2.08 V. The fabricated electrochemical double layer capacitor (EDLC) achieved the specific capacitance values of 24.46 F/g and 39.68 F/g via the cyclic voltammetry (CV) curve and the charge–discharge profile, respectively. The other significant parameters to evaluate the performance of EDLC have been determined, such as internal resistance (186.80 to 202.27 Ω) energy density (4.46 Wh/kg), power density (500.58 to 558.57 W/kg) and efficiency (92.88%).

Ionic conductivity, transference numbers, composition and mobility of ions in cross-linked lysozyme crystals

1996 ◽  
Vol 60 (1-2) ◽  
pp. 1-16 ◽  
Author(s):  
T.Ya. Morozova ◽  
G.S. Kachalova ◽  
N.F. Lanina ◽  
V.U. Evtodienko ◽  
A.S. Botin ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Transference Numbers ◽  
Mobility Of Ions ◽  
Lysozyme Crystals

Fluoride-ion-conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

ChemPhysChem ◽  
2015 ◽  
Vol 16 (17) ◽  
pp. 3631-3636 ◽  
Author(s):  
Luca Pasquini ◽  
Fabio Ziarelli ◽  
Stéphane Viel ◽  
Maria Luisa Di Vona ◽  
Philippe Knauth
Keyword(s):  
Diffusion Coefficient ◽  
Ionic Conductivity ◽  
Conducting Polymers ◽  
Fluoride Ion ◽  
Ion Diffusion ◽  
Ion Conducting ◽  
Ion Conducting Polymers

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

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 151 ◽  
Author(s):  
Jihad M. Hadi ◽  
Shujahadeen B. Aziz ◽  
Muaffaq M. Nofal ◽  
Sarkawt A. Hussein ◽  
Muhamad H. Hafiz ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Ionic Conductivity ◽  
Ac Conductivity ◽  
Electric Modulus ◽  
Linear Sweep Voltammetry ◽  
Device Fabrication ◽  
Electrical Impedance Spectroscopy ◽  
Electrochemical Performances ◽  
Casting Technique ◽  
Ion Conducting

In the present work, chitosan (CS) as a natural biopolymer was used to prepare nanocomposite polymer electrolytes (NCPEs) in order to reduce plastic waste pollution. The plasticized CS-based NCSPE has been prepared via the solution casting technique. The electrical properties of the films were investigated using AC conductivity, dielectric properties, electric modulus, and electrical impedance spectroscopy (EIS). The obtained results from the dielectric properties and electric modulus study confirm the non-Debye behavior of ion dynamics. The effect of glycerol plasticizer on ionic conductivity of the CS:AgNO3:Al2O3 system was investigated via AC conductivity and impedance studies. The conductivity of the samples was explained based on electrical equivalent circuits and Bode plots. The electrochemical properties such as transfer number measurement (TNM), linear sweep voltammetry (LSV), and cyclic voltammetry (CV) were carried out to inspect the sample suitability for electrochemical double-layer capacitor (EDLC) application. The highest conductivity was 3.7 × 10−4 S cm−1 with the electrochemical stability window up to 2.1 V at room temperature. Through the TNM study, the ionic conductivity of plasticized CS-based NCSPE was confirmed, and ion transport (tion) of the highest conducting sample was found to be 0.985. The activated carbon electrode with the highest conducting sample was employed in the EDLC device fabrication. Accordingly, it can be said that the highest conducting sample had capable performance to be applied in electrochemical device application.

scholarly journals Dielectric relaxations and ion transport study of NaCMC:NaNO3 solid polymer electrolyte films

Ionics ◽  
2021 ◽  
Author(s):  
Supriya K Shetty ◽  
Ismayil ◽  
Shreedatta Hegde ◽  
V Ravindrachary ◽  
Ganesh Sanjeev ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Solid Polymer Electrolyte ◽  
Transference Number ◽  
Ionic Mobility ◽  
Vital Role ◽  
Solid Polymer ◽  
Degree Of Crystallinity ◽  
Dielectric Relaxations ◽  
Ion Conducting

AbstractNa+ ion-conducting solid polymer electrolyte (SPE) of sodium salt of carboxymethyl cellulose (NaCMC) doped with sodium nitrate (NaNO3) was developed by solution casting method. FTIR technique confirmed the formation of hydrogen bonding between $$ {NO}_3^{-} $$ NO 3 − anion and functional groups of NaCMC. XRD study revealed the low degree of crystallinity that reduced upon doping. Impedance spectroscopy was adapted in order to analyze the conductivity and dielectric relaxation phenomena of the polymer-salt complex. FTIR deconvolution technique was employed to understand the factor that influences the ionic conductivity in SPE; concentration of mobile ions and ionic mobility both play a vital role. Ion transference number has been found out to be > 0.97 for all samples indicating that the conducting species are primarily ions. The highest ionic conductivity of ̴ 3 × 10−3 Scm−1 with the mechanical strength of 30.12 MPa was achieved for a host containing 30 wt.% NaNO3 at ambient temperature.

Electrical Properties of Starch Based Silver Ion Conducting Solid Biopolymer Electrolyte

2013 ◽  
Vol 701 ◽  
pp. 120-124 ◽  
Author(s):  
M.F. Shukur ◽  
F. Sonsudin ◽  
R. Yahya ◽  
Z. Ahmad ◽  
R. Ithnin ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Room Temperature ◽  
Electrical Impedance ◽  
Electrical Impedance Spectroscopy ◽  
Electrolyte System ◽  
Solution Cast ◽  
Electrical And Dielectric Properties ◽  
Biopolymer Electrolyte ◽  
Ion Conducting ◽  
Cast Technique

In the present study, the electrical and dielectric properties of a solid biopolymer electrolyte system based on starch doped with different amounts of silver nitrate (AgNO3) were analyzed. The electrolyte system was prepared via solution cast technique. Electrical impedance spectroscopy (EIS) measurement for the system was conducted over a frequency range of 50 Hz - 1 MHz at room temperature. It was found that the sample containing 6 wt.% AgNO3 obtained the highest conductivity value of 1.03 × 10-9 S cm-1. The effect of salt concentration on the dielectric properties of the electrolytes was also studied in relation to the conductivity properties. The dielectric studies indicated that the electrolytes in the present study obeyed non-Debye behavior.

scholarly journals Synthesis of Porous Proton Ion Conducting Solid Polymer Blend Electrolytes Based on PVA: CS Polymers: Structural, Morphological and Electrochemical Properties

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4890 ◽  
Author(s):  
Muaffaq M. Nofal ◽  
Shujahadeen B. Aziz ◽  
Jihad M. Hadi ◽  
Rebar T. Abdulwahid ◽  
Elham M. A. Dannoun ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Polymer Blend ◽  
Salt Content ◽  
Linear Sweep Voltammetry ◽  
Solid Polymer ◽  
Transference Numbers ◽  
Poly Vinyl Alcohol ◽  
Casting Technique ◽  
Peak Broadening ◽  
Ion Conducting

In this study, porous cationic hydrogen (H+) conducting polymer blend electrolytes with an amorphous structure were prepared using a casting technique. Poly(vinyl alcohol) (PVA), chitosan (CS), and NH4SCN were used as raw materials. The peak broadening and drop in intensity of the X-ray diffraction (XRD) pattern of the electrolyte systems established the growth of the amorphous phase. The porous structure is associated with the amorphous nature, which was visualized through the field-emission scanning electron microscope (FESEM) images. The enhancement of DC ionic conductivity with increasing salt content was observed up to 40 wt.% of the added salt. The dielectric and electric modulus results were helpful in understanding the ionic conductivity behavior. The transfer number measurement (TNM) technique was used to determine the ion (tion) and electron (telec) transference numbers. The high electrochemical stability up to 2.25 V was recorded using the linear sweep voltammetry (LSV) technique.

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