Plasticized H + ion-conducting PVA:CS-based polymer blend electrolytes for energy storage EDLC application
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Plasticized H+ ion-conducting PVA:CS-based polymer blend electrolytes for energy storage EDLC application Ayub Shahab Marf1, Shujahadeen B. Aziz1,2,*
, and Ranjdar M. Abdullah1
1
Advanced Polymeric Materials Research Lab, Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani, Kurdistan Regional Government, Iraq 2 Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Sulaimani 46001, Kurdistan Regional Government, Iraq
Received: 2 May 2020
ABSTRACT
Accepted: 2 September 2020
In this work, plasticized proton-conducting polymer blend electrolytes based on poly (vinyl alcohol): chitosan were synthesized, characterized, and utilized in an electric double-layer capacitor (EDLC). A structural study was performed using X-ray diffraction. The scarification and decrease of intensity of the crystalline peak were detected upon the addition of glycerol plasticizer (GP). The morphological appearance of the plasticized blend electrolyte films was examined through scanning electron microscopy, in which the role of GP on ion dissociation was indicated to be important. Electrochemical impedance spectroscopy was performed to estimate the conductivity of the films. Before the EDLC application, other electrochemical techniques, such as transference number measurement (TNM), linear sweep voltammetry (LSV), and cyclic voltammetry (CV), were carried out. To evaluate the performance of the EDLC, the charge– discharge profile was then examined. The EDLC has been cycled 250 times at a current density of 0.75 mA cm-2. The specific capacitance (Cspe) of the EDLC, which is known as an essential parameter, was found to be constant after the first cycle. The reduction in Cspe value was correlated with the increase of equivalent series resistance. Finally, the manners of energy (E) and power (P) densities as a function of the number of cycles were studied.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Electrical and optical characteristics of solid polymerbased electrolytes have been intensively and extensively studied. This is because of the wide applications of such materials in electrochemical devices, such as electric double-layer capacitor (EDLC) and
supercapacitor [1]. In recent decades, polymer electrolyte study becomes one of the hot research topics that have witnessed great progress [2]. Solid polymer electrolyte (SPE) possesses conductivity in the range of * 10–4 to 10–3 S cm-1, which is of great importance to be improved and utilized in the fabrication of highperformance energy storage devices. To improve the
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https://doi.org/10.1007/s10854-020-04399-z
J Mater Sci: Mater Electron
conductivity of SPE, attempts have been proposed [3–7]. SPEs have great advantages over the traditional electrolytes, for instance, shape tunability, design flexibility, free from leakage, and high mechanical strength. Such properties make
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