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Chandra A.,Shri Shankracharya Institute of Professional Management and Technology | Chandra A.,Dr. C.V. Raman University | Thakur K.,Government Pataleswar College
Russian Journal of General Chemistry | Year: 2013

Ion-conducting nanocomposite polymer electrolyte films based on poly(ethylene oxide)-NaPO3 3: 1 with up to 15 wt % of SiO2 have been prepared using recently developed hot-press technique instead of conventional solution cast method. With 7 wt % of SiO2, the film conductivity has been enhanced by an order of magnitude. The materials have been characterized by Fourier transform infrared spectrometry and thermogravimetric analysis. For the composition with the highest conductivity, the temperature dependences of ionic mobility, mobile ions concentration, ionic transference number, and ionic drift velocity have been determined. Dielectric constant and dielectric loss have been measured. The conductivity enhancement has been discussed on the basis of existing theories of dielectrics. © 2013 Pleiades Publishing, Ltd.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Chandra A.,Dr. C.V. Raman University | Thakur K.,Government Pataleswar College
Polymer Bulletin | Year: 2014

Synthesis and io n transport characterization of hot-pressed solid polymer electrolyte (SPE) membranes:(1 - x) poly (ethylene oxide) (PEO):x NaHCO 3, where 0 < x < 50 wt.%, have been reported. SPE films have been synthesized using a hot-press technique in place of the traditional solution-cast method. A conductivity enhancement of the two orders of magnitude was achieved in SPE film:70PEO:30NaHCO3 and this composition has been referred to as optimum conducting composition (OCC). Materials characterization was done with the help of XRD, SEM, FTIR, DSC and TGA techniques. The ion transport behavior in SPE membranes has been discussed on the basis of experimental measurements on their ionic conductivity (σ), ionic mobility (μ) and some other important parameters. A solid-state polymer battery was fabricated using SPE OCC at room temperature, as a device application. © 2013 Springer-Verlag Berlin Heidelberg.


Chandra A.,Shri Shankracharya Institute of Professional Management and Technology | Chandra A.,Dr. C.V. Raman University | Thakur K.,Government Pataleswar College
EPJ Applied Physics | Year: 2015

Synthesis and ion transport characterization of hot-pressed poly(ethylene oxide) PEO-based solid polymer electrolytes (SPEs): (1 - x) PEO: x NaClO4, where 0 < x < 50 wt.%, are reported. The composition: (70PEO: 30NaClO4) with ionic conductivity (σ) ~ 7.07 × 10-7 S cm-1 shows the highest conducting composition and this have been referred to as optimum conducting composition (OCC). Materials characterization and thermal behavior of the present SPEs have been done with the help of XRD, FTIR, SEM, DSC and TG analysis. To determine the activation energy, temperature dependent ionic conductivity (σ) of different compositions has been measured. Ionic nature of the SPEs has been explained with the help of ionic transference number (tion) measurements. Finally, the thin film polymer battery is also fabricated using the SPE OCC as electrolyte and calculated their cell parameters at room temperature. © EDP Sciences, 2015.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Chandra A.,Dr. C.V. Raman University | Thakur K.,Government Pataleswar College
Composites Part B: Engineering | Year: 2014

Synthesis and characterization of hot-pressed ion conducting nano-composite polymer electrolytes or polymer-matrix composites (NCPEs/PMCs):(1 - x)[80PEO:20KI]:xSiO2 where 0 < x < 14 wt.%, are reported. NCPEs were cast using a recently developed hot-press method in place of traditional solution-cast/sol-gel technique. Two and half orders of conductivity enhancement were found in NCPEs after the dispersion of nano-sized SiO2 inert material in the polymeric host, from the room temperature conductivity measurement. The polymer-salt/nano-filler SiO2 complexation, surface analysis and thermal properties characterization were done with the help of XRD, SEM, DSC and TGA studies. The ionic conductivity (σ) enhancements were explained using various experimental results viz. ionic mobility (μ), mobile ion concentration (n) values and various theoretical models. The ionic transference number (tion) of optimum conducting composition of NCPE was also determined with the help of Transient Ionic Current (TIC) technique. To compute the activation energy (Ea) in NCPEs, the temperature dependent conductivity studies were done and Ea values were determined by using log σ-1/T Arrhenius plots. A solid state polymer battery was fabricated using the NCPE OCC as an electrolyte and cell-potential discharge characteristic studies were also reported with different load conditions at room temperature. © 2013 Elsevier Ltd. All rights reserved.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Chandra A.,Dr. C.V. Raman University | Thakur K.,Government Pataleswar College
Arabian Journal of Chemistry | Year: 2013

Synthesis and ion conduction studies on SiO2 dispersed hot-pressed sodium ion conducting nano-composite polymer electrolytes (100 - x)[70PEO:30NaHCO3] + xSiO2, where x is in wt.%, are reported. The nano-composite polymer electrolytes (NCPEs) are cast by the dispersion of nano-filler SiO2 using a hot-press method in place of the traditional solution-cast technique. The effect of nano-filler SiO2 is characterized with the help of some basic ion transport parameters viz. ionic conductivity, ionic mobility, mobile ion concentration and activation energy measurements. The material characterization and polymer-salt/SiO2 complexation are reported with the help of XRD, FTIR, SEM, DSC and TGA studies. Based on SPE host and NCPE OCC, a solid state polymeric battery fabrication and cell-potential discharge characteristics are also reported at different load conditions. © 2013.

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