Browsing by Author "Shri Prakash Pandey"

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Electrical conductivity of pectin-based biopolymer electrolytes: search for a theoretical framework
(Springer Science and Business Media Deutschland GmbH, 2024) Kailash Kumar; Ikhwan Syafiq Mohd Noor; Shri Prakash Pandey; Bhaskar Bhattacharya; Amit Saxena
This paper reports the successful fabrications of polymer electrolytes using biopolymer pectin in conjunction with ammonium azide (NaN3) salt by solution casting method. The ionic conductivity of these electrolytes was evaluated using EIS at room temperature. Among the compositions tested, the highest conductivity of 2.3 × 10−3 S cm−1 was observed to sample of 5 wt.% of NaN3. The charge carriers' concentration (n) and mobility (µ) were calculated to understand the conductivity behavior attributed to dispersoids. For the calculation of n and μ, two theoretical models were used, namely the Trukhan and the S&G Model. The correlations between conductivity, n and μ are discussed. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Electrical conductivity of pectin-based biopolymer electrolytes: search for a theoretical framework
(Springer Science and Business Media Deutschland GmbH, 2025) Kailash Vijaya Kumar; Ikhwan Syafiq Mohd Noor; Shri Prakash Pandey; Bhaskar Bhattacharya; Amit Saxena
This paper reports the successful fabrications of polymer electrolytes using biopolymer pectin in conjunction with ammonium azide (NaN3) salt by solution casting method. The ionic conductivity of these electrolytes was evaluated using EIS at room temperature. Among the compositions tested, the highest conductivity of 2.3 × 10−3 S cm−1 was observed to sample of 5 wt.% of NaN3. The charge carriers' concentration (n) and mobility (µ) were calculated to understand the conductivity behavior attributed to dispersoids. For the calculation of n and μ, two theoretical models were used, namely the Trukhan and the S&G Model. The correlations between conductivity, n and μ are discussed. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Humidity-Dependent Ion Conduction Mechanism of PVA-Based Polymer Electrolyte Films
(John Wiley and Sons Inc, 2023) Kailash Kumar; Kushal Mehrotra; Ashish Raj; Shri Prakash Pandey; Bhaskar Bhattacharya
Polymer electrolytes are studied worldwide for their possible applications in various electrochemical devices. In the last few decades, a large number of polymer electrolytes have been developed and characterized. However, in most cases, the effect of humidity has been ignored. In this paper, we report a systematic study on a polymer electrolyte's electrical and dielectric properties at different humidity. The chosen system is a Polyvinyl Alcohol (PVA) based polymer electrolyte in which potassium iodide (KI) with differing weight percentage is selected as the dopant salt for the synthesis of PVA-KI films. Four different compositions of PVA-KI films are synthesized using the solution cast technique. Electrical impedance spectroscopy (EIS) technique is used to determine its conductivity at three different humidity levels: 55%, 75%, and 85%. Analysis of dielectric permittivity and electrical modulus of the films is also done at these humidity levels. The highest conductivity for all the four different compositions of films is found to be at 85% humidity level, of which the optimum ionic conductivity is seen in the 75:25 composition of PVA:KI with a value of 1.25×10−4 S cm−1.The number of charge carriers and their mobility are calculated for all samples at different humidity levels. A correlation has been established between the conductivity of the films and the mobility of charge carriers. © 2023 Wiley-VCH GmbH.
(ICSEM 2025): Electrical Properties of Nano-ZnS Incorporated Polymer Electrolyte Films: A Conductivity Analysis for Energy Devices
(John Wiley and Sons Inc, 2025) Ashish Raj; Pavan Kumar Singh; Munendra Singh; Amit Saxena; Bhaskar Bhattacharya; Shri Prakash Pandey
The tunable electrical conductivity of nano-ZnS-doped polymer electrolyte films presents substantial possibilities for a variety of devices. The main goal of this study is to find the best way to make polymer electrolyte films work better in electrochemical devices by looking into how their electrical properties change with concentration. We selected poly(vinyl alcohol) (PVA) and potassium iodide (KI) as the polymer electrolyte matrix based on their composition, which exhibited maximum conductivity. Nano-ZnS was synthesized via the chemical precipitation method and incorporated as a nanofiller into the PVA-KI matrix at varying concentrations using a controlled stirring process. Solution casting approach was adopted to fabricate the polymer electrolyte films. We studied the electrical properties of the free-standing solid polymer composite films using impedance spectroscopy, the structural properties using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the optical properties using Fourier-transform infrared spectroscopy (FTIR). The results indicate that the ionic conductivity of the films increases with increasing nano-ZnS concentration up to a critical threshold, beyond which conductivity plateaus or declines. The maximum conductivity of 4.1 × 10−⁴ S/cm was obtained for 7 wt.% concentration. We further analyze this conductivity behavior in relation to the dispersion of nano-ZnS within the polymeric matrix and its influence on ionic transport mechanisms. These findings offer insights into the optimal nano-ZnS concentration required to achieve high conductivity in polymer composite electrolytes, contributing to the development of efficient and durable solid-state batteries and electrochemical sensors. © 2025 Wiley-VCH GmbH.