Investigation of blend biopolymer electrolytes based on Dextran-PVA with ammonium thiocyanate
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ORIGINAL PAPER
Investigation of blend biopolymer electrolytes based on Dextran-PVA with ammonium thiocyanate T. Maheshwari 1,2 & K. Tamilarasan 1 & S. Selvasekarapandian 2,3 & R. Chitra 2,4 & S. Kiruthika 1,2 Received: 24 August 2020 / Revised: 20 October 2020 / Accepted: 21 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A new polymer electrolytes based on Dextran, poly vinyl alcohol (PVA) with different concentrations of ammonium thiocyanate (NH4SCN) have been prepared by solution casting technique using distilled water as a solvent. The synthesized biopolymer membranes have been characterized by various techniques such as X-ray diffraction (XRD), Fourier transform–infrared spectroscopy (FTIR), differential scanning calorimetric (DSC), AC impedance, linear sweep voltammetry (LSV), and transference number measurement. The increase in amorphous nature of the blend polymer (700 mgDextran:300 mgPVA) with increase in salt concentration is observed in XRD pattern. The complex formation between the blend polymer and salt has been confirmed by FTIR. The glass transition temperature (Tg) of the prepared polymer membranes have been analyzed by DSC. From AC impedance analysis, a maximum ionic conductivity of 8.03 × 10−3 S/cm has been achieved by incorporation of 0.6 M.wt% NH4SCN with blend polymer (700 mgDextran:300 mgPVA). The electrochemical stability of the highest conducting polymer electrolyte 700 mgDextran:300 mgPVA:0.6 M.wt%NH4SCN has been observed as 3.01 V by LSV. From Wagner’s polarization method, transference number has been calculated. The proton battery has been constructed with the highest conducting polymer electrolyte 700 mgDextran:300 mgPVA:0.6 M.wt%NH4SCN. The open-circuit voltage (OCV) has been observed as 1.75 V and the battery performance is studied. Keywords Dextran . PVA . XRD . FTIR . AC impedance . Primary proton battery
Introduction In recent days, there is a requirement for increasing energy and environmental challenges demand clean, reliable, low cost, low toxicity, pollution free, and sustainable energy source for the modern society. One of the feasible technologies is to use green energy (or) green materials in energy devices. Generally, the electrochemical devices such as supercapacitor, batteries, fuel cell, sensors, and dye-sensitized solar cells are
* S. Selvasekarapandian [email protected] 1
Department of Physics, Kongu Engineering College, Perundurai, Erode, Tamil Nadu 638060, India
2
Materials Research Center, Coimbatore, Tamil Nadu 641045, India
3
Department of Physics, Bharathiar University, Tamil Nadu 641046 Coimbatore, India
4
Department of Physics, Kongu Arts and Science College, Erode, Tamil Nadu 638107, India
most preferred energy devices. Now day’s researchers have great attention to use green materials in the above electrochemical devices. Solid polymer electrolyte (SPE) plays an important role in the electrochemical devices, because of its great advantages like dimensional stability, flexibility, safety, high electrochem
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