Browsing by Author "Sandhya Gupta"

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Change in charge carrier dynamics by incorporating ionic liquid into poly ethylene oxide–based sodium acetate polymer electrolytes
(SAGE Publications Ltd, 2022) Sandhya Gupta; Pramod K Singh; B. Bhattacharya
Poly (ethylene oxide) based sodium ion conducting solid polymer electrolytes films (salt NaCH3COO) with varying amounts of an ionic liquid, 1-ethyl 3-methylimidazolium thiocyante were prepared by solution-cast method. All the prepared samples were characterized in detail for their ion transport characteristics at room temperature and temperature dependent behavior as well using electrochemical impedance spectroscopy. The measurement of ionic conductivity shows the many fold enhancement due the incorporation of ionic liquid in the polymer electrolyte matrix. The charge carrier density and mobility of charge carriers has been calculated and used for explaining the conductivity variations in these films. The increase in conductivity has been explained in terms of plasticization effect of ionic liquid and number of charge carriers per unit volume of electrolyte. © The Author(s) 2022.
CHARGE CARRIER DYNAMICS IN ION CONDUCTING POLYMER ELECTROLYTES
(Nova Science Publishers, Inc., 2022) Sandhya Gupta; Bhaskar Bhattacharya
Ion conduction in polymer electrolytes is of prime interest for their choice and optimum use in electrochemical devices. Since the pioneering works of Wright and Fenton, Armand and others during more than four decades, a variety of ion conducting polymer electrolytes have been prepared and studied for their optimum applications. However, due to non availability of any mechanism for the direct measurement of either mobility of ions or their density (number per unit volume in the electrolyte) major focus remained towards increasing the conductivity and their application in batteries, supercapacitors, etc. Only a few reports were available where these two parameters have been determined by any methods and correlated with other parameters. The basics of physics tells that the conductivity (?) is equal to the product of number of charge carriers contributing to the conduction (n), their mobility (?) and the charge being carried by them. Therefore, in order to enhance the conductivity of electrolytes or at least to know the reason behind the variation in conductivity with any other parameter like doping concentration or temperature, it is absolutely essential to know the values of n or ?. It may be noted that any change in may be due to change in n, or their cumulative effects. The primary parameters n and that control the conductivity have been identified and discussed in this article. © 2022 by Nova Science Publishers, Inc.