Browsing by Author "Pravin Kumar Ray"

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Ionic liquid based NCPBE membranes for electrochemical capacitor applications: Structural, thermal and electrical transport properties
(Elsevier B.V., 2024) A.L. Saroj; Chandrakant Kumar Gond; Pooja Rawat; R.K. Prajapati; Gulshan Kumar Meena; Pravin Kumar Ray
The current study focuses on the preparation and characterisation of imidazolium ionic liquid based plasticized nano-composite polymer blend electrolytes (NCPBEs). Semi-crystalline nature of the synthesized samples was observed using XRD analysis. ATR-FTIR results demonstrate the interaction among the carbonyl (C[dbnd]O) and hydroxyl (O–H) groups of polymers with ionic liquid (IL) and salt, NaI. Furthermore, thermo-gravimetric analysis (TGA) indicates multi-step decomposition process. Ion transport mechanism has been analysed using temperature dependent conductivity analysis, ac conductivity analysis and dielectric properties study. The sample containing 25 wt% IL i.e. NCPBE-25 has the ionic conductivity ∼9.30 × 10−4 Scm−1 with the optimum vale of charge carrier density, mobility, and ion diffusivity at 30oC. Ions are principal charge carriers in the present electrolytes. The sample NCPBE-25 has the electro-chemical stability window −3.6 to 1.5 V at room temperature. The fabricated electro-chemical capacitor has the specific capacitance, energy density and power density 363.27 Fg-1, 50.45 Whkg−1 and 18.16 kW/kg, respectively at the scan rate 5 mV/s. © 2024 Elsevier B.V.
Vibrational, dielectric and ion transport properties study of CMC-EDTA-PEG-based biopolymer electrolyte membranes
(Polymer Society of Korea, 2023) Pravin Kumar Ray; Devesh Chandra Bharati; J.P. Singh; A.L. Saroj
Carboxymethyl cellulose (CMC) + xwt% Ethylenediaminetetraacetic acid (EDTA) (x = 0, 10, 20, 30, 40)-based biopolymer electrolytes (BPEs) plasticised with polyethylene glycol (PEG) were prepared by using solution cast method. Fourier transform infrared (FTIR) spectroscopic analysis shows the complexation of salt, EDTA with the functional groups of CMC. Impedance analysis shows that the sample containing 20wt%EDTA has the optimum dc conductivity ~ 8.95 × 10–5 S/cm at 30 °C with least activation energy ~ 0.25 eV. Temperature-dependent dc conductivity, dielectric properties and ion dynamics have been analyzed to explore the ion transport mechanism. The scaling of frequency-dependent conductivity and loss tangent were analyzed with respect to EDTA concentration and temperatures. Mobility (µ), charge carrier density (N) and ion diffusivity (D) for all samples were estimated and the sample containing 20wt% EDTA shows the optimum values. Ionic transference number (ITN) measurements reveal that ions are the principal charge carriers. Electrochemical stability window (ESW) was found to be ~ ± 2 V for 20wt% EDTA containing sample. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s), under exclusive licence to The Polymer Society of Korea.