Time filter

Source Type

Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Polymer Bulletin | Year: 2017

Synthesis and ion transport characterization of a new K+-ion conducting nano-composite polymer electrolytes (NCPEs): (1−x) [70PEO:30KBr] + x SiO2, where 0 < x < 20 wt%, are reported. The present NCPEs have been cast using a novel hot-press technique in place of the traditional solution cast method. The conventional solid polymer electrolyte (SPE) composition: (70PEO:30KBr), identified as the highest conducting composition at room temperature, has been used as first-phase host matrix and nano-size (~8 nm) particles of SiO2 as second-phase dispersoid. As a consequence of dispersal of SiO2 in SPE host, two orders of conductivity enhancement have been observed in NCPE composition: [95(70PEO:30KBr) + 5SiO2] and this has been referred to as optimum conducting composition (OCC). The polymer-salt/nano-filler SiO2 complexation and thermal properties characterization were done with the help of XRD, FTIR, SEM, DSC and TGA studies. The ion transport behavior in NCPEs have been discussed on the basis of experimental measurements on some basic ionic parameters, viz. conductivity (σ), ionic mobility (μ), mobile ion concentration (n), ionic transference number (tion), etc. The temperature-dependent conductivity studies of NCPE OCC have been done and activation energy (Ea) value was determined using log σ−1/T Arrhenius plot. © 2017 Springer-Verlag Berlin Heidelberg


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Thakur K.,National Institute of Technology Raipur
Portugaliae Electrochimica Acta | Year: 2012

Synthesis, characterization and polymeric battery studies of Na + ion conducting Nano- Composite Polymer Electrolyte (NCPE) membranes: (1-x) [75PEO: 25NaPO 3]: x SiO 2, where x = 0 - 15 wt. (%), has been reported. NCPE membranes have been casted using a novel hot-press technique in place of the traditional solution cast method. The dispersal of SiO 2 in SPE host: (75PEO: 25NaPO 3), a conductivity enhancement of an order of magnitude achieved in NCPE film: [93 (75PEO: 25NaPO 3): 7 SiO 2]. This has been referred to as Optimum Conducting Composition (OCC). Material characterizations have been done with the help of XRD, SEM and DSC techniques. The ion transport behaviour in hot-pressed NCPEs has been discussed on the basis of experimental measurements on some basic ionic parameters viz. conductivity (σ), ionic mobility (μ), mobile ion concentration (n) and ionic transference number (t ion). The temperature dependent conductivity studies have been done to compute the activation energy (E a) values from the 'log σ - 1/T' Arrhenius plots. The ion conducting solid state polymeric battery was fabricated and cell-potential discharge characteristics have been studied at different load conditions.


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
Indian Journal of Pure and Applied Physics | Year: 2013

Synthesis and dielectric studies on a new PEO-PVP blended Na+ ion conducting solid polymer electrolytes (SPEs): (1-x)[75PEO:25NaPO 3]+x PVP, where x in wet. %, are reported. PEO-PVP blended Na + ion conducting SPEs are synthesized using recently developed hot-press method in place of traditional solution cast technique. Structural characterization has been carried out using XRD technique. The some basic ion transport parameters viz. ionic conductivity (σ), activation energy (Ea) and dielectric constant (ε*) have been characterized using different experimental techniques.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Indian Journal of Physics | Year: 2013

Synthesis and ion transport characterization of a new Ag+ ion conducting glass-polymer electrolyte (GPE) films: (1-x) PEO: x [0.8(0.75AgI:0.25AgCl):0.2(Ag2O:V2O5)], where 0 < x < 50 wt%, are reported. The composition: 70PEO: 30[0.8(0.75AgI:0. 25AgCl):0.2(Ag2O:V2O5)] with conductivity (σ) ~7.7 × 10-7 Ω-1 cm-1 is identified as highest conducting composition referred to as the optimum conducting composition (OCC). Approximately two and half orders of conductivity enhancement have been achieved in OCC from that of the pure polymer poly(ethylene oxide). The glass-polymer complexation is confirmed by the XRD, FTIR, DSC and TGA techniques. The ion transport behavior has been reported on the basis of experimental measurements on some basic ionic parameters. A solid state polymeric battery has been fabricated by using GPE OCC as an electrolyte and their important cell parameters have been also calculated from the discharge profiles. © 2013 Indian Association for the Cultivation of Science.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Chinese Journal of Polymer Science (English Edition) | Year: 2013

Polyethylene oxide (PEO)-polyvinylpyrrolidone (PVP) blended Na+ ion conducting solid polymeric membranes: (1-x) [75PEO:25NaPO3] + x PVP, where 0 < x < 12 wt%, are reported. The polymeric blending was done using a solventfree hot-press method. Two orders of conductivity enhancement (σ ca. 1.07 × 10-5 S·cm-1) have been achieved with 3 wt% of PVP (i.e. the composition: [97(75PEO:25NaPO3) + 3PVP]), from that of the pure host: (75PEO:25NaPO3). The conductivity enhancement in PEO-PVP blended solid polymeric membranes have been explained by the ionic conductivity, ionic mobility and mobile ion concentration measurements. Materials characterization and polymer-salt complexation were done with the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA) studies. The temperature dependent conductivity studies have also been done to compute the activation energy (E a) values from lg σ1/T Arrhenius plots. A solid state polymeric battery was fabricated by using optimum conducting composition of solid polymer electrolyte (SPE OCC), and some important cell parameters were also calculated from the discharge profile of the cell. © 2013 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Bulletin of Materials Science | Year: 2015

Ionic drift velocity (vd) measurements of a new Ag+ ion conducting glass-polymer electrolytes (GPEs): (1-x)PEO: x [0.8(0.75AgI: 0.25AgCl): 0.2(Ag2 O: V2O5)], where 0


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
EPJ Applied Physics | Year: 2014

Superionic solids an area of multidisciplinary research activity, incorporates to study the physical, chemical and technological aspects of rapid ion movements within the bulk of the special class of ionic materials. It is an emerging area of materials science, as these solids show tremendous technological scopes to develop wide variety of solid state electrochemical devices such as batteries, fuel cells, supercapacitors, sensors, electrochromic displays (ECDs), memories, etc. These devices have wide range of applicabilities viz. power sources for IC microchips to transport vehicles, novel sensors for controlling atmospheric pollution, new kind of memories for computers, smart windows/display panels, etc. The field grew with a rapid pace since then, especially with regards to designing new materials as well as to explore their device potentialities. Amongst the known superionic solids, fast Ag+ ion conducting crystalline solid electrolytes are attracted special attention due to their relatively higher room temperature conductivity as well as ease of materials handling/synthesis. Ion conduction in these electrolytes is very much interesting part of today. In the present review article, the ion conducting phenomenon and some device applications of crystalline/polycrystalline superionic solid electrolytes have been reviewed in brief. Synthesis and characterization tools have also been discussed in the present review article. © 2014 EDP Sciences.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Indian Journal of Physics | Year: 2016

Synthesis and ion transport studies of hot pressed K+ ion conducting solid polymer electrolytes (SPEs): (1 − x) PEO:x KBr, where 0 < x < 50 in wt%, are reported. The solvent-free/hot-press method is used for synthesis of the present SPEs. The two orders of conductivity enhancement achieved after the polymer-salt complexation in SPE composition: (70:30) with conductivity (σ) ~ 5.01 × 10−7 S cm−1 from the room temperature conductivity measurements. Materials characterization and polymer-salt complexations of present SPEs have been explained with the help of various techniques viz. X-ray diffraction, Fourier transform infrared, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy technique. To explain the ion conduction in the present SPEs, temperature dependent ionic conductivity (σ), ionic mobility (μ), mobile ion concentration (n), ionic transference number (tion) and ionic drift velocity (vd) have been calculated with the help of various experimental techniques. A solid state polymer battery is also fabricated by using the present SPE as an electrolyte and have been calculated their important cell parameters at room temperature. © 2015, Indian Association for the Cultivation of Science.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology
Polymer Bulletin | Year: 2016

Polymer blending and ion transport characterization of a new poly ethylene oxide (PEO) with polyvinylpyrrolidone (PVP)-based solid polymer electrolytes (SPEs): (1 − x) [70PEO:30KBrO3] + x PVP, where 0 < x < 20 wt%, are reported. The polymeric blending was done using a hot-press method. To explain the materials characterization, XRD, SEM, DSC and TGA studies are reported. The conductivity enhancement in SPE was explained by the direct determination of ionic mobility (μ), mobile ion concentration (n) and activation energy using different experimental techniques. Solid-state polymeric batteries were fabricated using optimum conducting composition of SPE as an electrolyte and the cell potential discharge characteristics was studied under different load conditions. © 2016 Springer-Verlag Berlin Heidelberg

Loading Shri Shankaracharya Institute of Professional Management and Technology collaborators
Loading Shri Shankaracharya Institute of Professional Management and Technology collaborators