yugal kishor Mahipal - Academia.edu (original) (raw)
Papers by yugal kishor Mahipal
New Journal of Chemistry, 2022
Graphene prepared through exfoliation process was printed on paper substrate using inkjet-printer... more Graphene prepared through exfoliation process was printed on paper substrate using inkjet-printer and then printed paper electrode was used as an electrochemical sensor for analysis of H2O2 in cyclic voltammetry.
Microchemical Journal, 2020
Development of low-cost paper based disposable electrodes printed with silver nano-ink using desk... more Development of low-cost paper based disposable electrodes printed with silver nano-ink using desktop inkjet printer is reported in this work. A stable nano-ink was prepared by dissolving 3% silver nanoparticles (AgNPs) capped with polyvinylpyrrolidone (PVP) in ethanol as a dispersing solvent. Highly stable silver nano-ink with surface tension of 21.1 mN/M and viscosity of 2.6 mPa.S was prepared for printing on photo paper that can be used as an electrode for electrochemical analyses. The fabricated paper electrode was exploited as a counter electrode in cyclic voltammetry (CV) analysis of potassium ferricyanide with better stability and reproducibility (relative standard deviation (RSD) 1.6%) for multiple times of analyses (n = 60) and compared with the results of conventional electrodes. Further, the printed paper electrode was demonstrated to be used as a working electrode for analysis of nitrate by CV. The use of paper electrode is found to be simple, rapid, user-friendly and can be applied at the sample source for determination of nitrate from different samples.
Journal of Materials Research, Mar 16, 2023
354-357Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(... more 354-357Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1-x)PEO: xAg(ClO4)], where x = 0, 2, 4, 6, 8, 10, 15, 20 wt. (%), has been studied. SPE films of uniform thickness ~100-150 mm have been casted by hot-press technique. The conductivity dependent on salt concentration has been measured and SPE film: [85PEO: 15 Ag (ClO4)] has been identified as Optimum Conducting Composition (OCC) with room temperature conductivity (s) ~ 5.64 10-6 S/cm. The characterization of materials and ion transport properties in SPE OCC film have been done. In order to understand the ion transport mechanism, conductivity (σ), total ionic transference number (tion) and cation (Ag+) transport number (<i style="mso-bidi-font-style: normal">t+) have been determined using <i style="mso-bidi-font-style: normal">ac impedance, dc polarization and combined ac/dc techniques, respectively. The temperature dependent conductivity has also been meas...
320-323Ion transport properties of Mg2+-ion conducting nano composite polymer electrolyte (NCPE) ... more 320-323Ion transport properties of Mg2+-ion conducting nano composite polymer electrolyte (NCPE) films have been investigated. NCPE membranes were cast by a completely dry/solution free hot-press technique. Solid Polymer Electrolyte (SPE) composition: [85PEO: 15Mg(ClO4)2], identified as the highest conducting film in a separate study with room temperature conductivity σ ~ 2.2710-6 S /cm, has been used as Ist-phase host matrix and different active (<span style="mso-ansi-language:EN-IN; mso-fareast-language:EN-IN">micro/nano-sized MgO) and passive (nano-sized SiO2 and <span style="mso-ansi-language: EN-IN;mso-fareast-language:EN-IN">TiO2) filler particles as IInd-phase dispersoid. Effect of fillers of different nature on ionic conductivity has been studied. As a consequence of dispersal of filler particles in fractional amount, conductivity (σ) enhancement of approximately one order of magnitude could be achieved at room temperature along with substanti...
Solid State Ionics, 2011
Materials and ion transport property characterization in Solid Polymer Electrolyte (SPE) membrane... more Materials and ion transport property characterization in Solid Polymer Electrolyte (SPE) membranes: (1−x) PEO: x KIO3, where x=0, 10, 20, 30, 40, 50wt.%, have been studied. SPE films have been prepared following two casting techniques: a novel hot-press (extrusion) and the traditional solution cast. Hot-press technique is a completely dry/solvent free/rapid/inexpensive procedure as compared to solution cast method and has recently been receiving wider acceptability to cast membranes of ion conducting polymeric electrolytes.‘Log σ−x’ study revealed σ-maxima at salt concentration x=30wt.% for SPE film prepared by both the methods. However, hot-pressed SPE film: 70 PEO: 30 KIO3 exhibited relatively higher room temperature conductivity (σ∼4.40×10−7Scm−1) than that of the solution casted film. This has been referred to as Optimum Conducting Composition (OCC) SPE film. Materials characterization in OCC SPE film has been done by XRD, FTIR and DSC techniques. These studies confirmed the complexation of salt in the polymeric host. Some basic ionic parameters viz. conductivity (σ), ionic mobility (μ), mobile ion concentration (n), ionic transference number (tion) have been determined using different experimental procedures to understand the ion transport behaviour in OCC SPE material. The temperature dependent conductivity measurement has also been carried out and the activation energy (Ea) has been computed from the linear least square fitting of ‘log σ−1/T’ Arrhenius plot.
New Journal of Physics, 2008
... Phys. 57 123 [15] Chandra S, Tolpadi SK and Hashmai SA 1988 Solid State Ion. 2830 651 [16] C... more ... Phys. 57 123 [15] Chandra S, Tolpadi SK and Hashmai SA 1988 Solid State Ion. 2830 651 [16] Chandra S, Hashmai SA, Saleem M and Agrawal RC 1993 Solid State Ion. ... 701 43 Maier J 1995 Proc. Solid State Chem. 23 171 [18] Agrawal RC and Gupta RK 1999 J. Mater. Sci. ...
Journal of Solid State Electrochemistry
![Research paper thumbnail of Ion transport characterization and cell potential discharge performance studies of hot-press casted solid polymer electrolyte (SPE): [(1 - x )PEO: x Ag(ClO 4 )]](https://attachments.academia-assets.com/78578591/thumbnails/1.jpg)
](Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1−x)PEO... more Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1−x)PEO: xAg(ClO4)], where x = 0, 2, 4, 6, 8, 10, 15, 20 wt. (%), has been studied. SPE films of uniform thickness ~100-150 μm have been casted by hot-press technique. The conductivity dependent on salt concentration has been measured and SPE film: [85PEO: 15 Ag (ClO4)] has been identified as Optimum Conducting Composition (OCC) with room temperature conductivity (σ) ~ 5.64× 10 S/cm. The characterization of materials and ion transport properties in SPE OCC film have been done. In order to understand the ion transport mechanism, conductivity ( ), total ionic transference number (tion) and cation (Ag ) transport number (t+) have been determined using ac impedance, dc polarization and combined ac/dc techniques, respectively. The temperature dependent conductivity has also been measured to evaluate the activation energy (Ea) from the linear least square fitting of ‘log −1/T’ Arrhenius plot. All-sol...
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Solid Polymer Electrolyte (SPE) films, based on poly (ethylene oxide) PEO complexed with Silver A... more Solid Polymer Electrolyte (SPE) films, based on poly (ethylene oxide) PEO complexed with Silver Acetate (AgCOOCH3) in different salt concentrations (x)= 0,3,5,7,10,15,20,25,30 wt.(%), have been prepared using hot press cast. Saltconcentration dependent conductivity study identified SPE film: [93PEO: 7AgCOOCH3] as Optimum Conducting Composition (OCC) with room temperature conductivity (σrt) ~ 1.13 x 10 -7 S/cm, which is approximately two orders of magnitude higher than that of pure PEO (σrt ~ 3.20 x 10 -9 S/cm). The complexation of salt in polymeric host has been confirmed by XRD/FTIR/SEM/DSC studies. Ion transport property has been characterized in terms of ionic conductivity (), total ionic (tion) / cation (t+) transport numbers. Temperature dependent conductivity has also been measured to understand ion transport mechanism and to compute activation energy (Ea) by least square linear fitting of ‘log σ1/T’ Arrhenius plot. Keywords— Solid Polymer Electrolyte (SPE), Hot-press Casting...
1 , has been used as the I st – phase host matrix and SiO2 filler particles of nano-dimension (~ ... more 1 , has been used as the I st – phase host matrix and SiO2 filler particles of nano-dimension (~ 8 nm) as II nd – phase dispersoid. The fractional dispersal of SiO2 filler (viz. x = 5 wt. %) in I st – phase SPE host resulted into nearly three fold increase in the room temperature conductivity. This NCPE film: (70PEO: 30 KNO3) + 5 SiO2 has been referred to as Optimum Conducting Composition (OCC) NCPE film. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared (FTIR) techniques have been used to study the morphological, structural, thermal and spectroscopic responses respectively of NCPE OCC film material. The ion transport behaviour has been characterized in terms of basic ionic parameters viz. conductivity (), mobility (μ), mobile ion concentration (n) and ionic transport number (tion). The frequency dependent dielectric response has also been studied in the temperature range 303-353 K. The newly synthesi...
Ion transport properties of Mg 2+ -ion conducting nano composite polymer electrolyte (NCPE) films... more Ion transport properties of Mg 2+ -ion conducting nano composite polymer electrolyte (NCPE) films have been i nvestigated. NCPE membranes were cast by a completely dry/solution free hot-press technique. Solid Polymer Electrolyte (SPE) composition: [85PEO: 15Mg(ClO4)2], identified as the highest conducting film in a separate study with room t emperature conductivity � ~ 2.27×10 -6 S /cm, has been used as I st -phase host matrix and different active (micro/nano-sized M gO) and passive (nano-sized SiO2 and TiO2) filler particles as II nd -phase dispersoid. Effect of fillers of different nature on i onic conductivity has been studied. As a consequence of dispersal of filler particles in fractional amount, conductivity (�) enhancement of approximately one order of magnitude could be achieved at room temperature along with substantial improvement in the mechanical integrity of the film. The total ionic transference number (tion) and the cationic (Mg 2+ ) t ransference number (t+) have bee...
Ionics
Poly (ethylene oxide) (PEO) based Nano-Composite Polymer Electrolyte (NCPE) membranes: (70PEO: 30... more Poly (ethylene oxide) (PEO) based Nano-Composite Polymer Electrolyte (NCPE) membranes: (70PEO: 30KNO 3) + x SiO 2 , where x = 0, 1, 2, 3, 5, 8, 10, 12 wt. (%), have been casted by hot-press/ solution free technique. Solid Polymer Electrolyte (SPE) composition: (70PEO: 30 KNO 3) (wt. %), reported earlier as highest conducting film with room temperature conductivity ( rt) ~ 3.98 x 10-7 Scm-1 , has been used as the I stphase host matrix and SiO 2 filler particles of nano-dimension (~ 8 nm) as II ndphase dispersoid. The fractional dispersal of SiO 2 filler (viz. x = 5 wt. %) in I stphase SPE host resulted into nearly three fold increase in the room temperature conductivity. This NCPE film: (70PEO: 30 KNO 3) + 5 SiO 2 has been referred to as Optimum Conducting Composition (OCC) NCPE film. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared (FTIR) techniques have been used to study the morphological, structural, thermal and spectroscopic responses respectively of NCPE OCC film material. The ion transport behaviour has been characterized in terms of basic ionic parameters viz. conductivity (), mobility (µ), mobile ion concentration (n) and ionic transport number (t ion). The frequency dependent dielectric response has also been studied in the temperature range 303-353 K. The newly synthesized NCPE OCC membrane has been sandwiched between K-metal anode and different cathodes to fabricate all-solid-state battery having following cell configurations: Cell # 1 : K (anode) // NCPE film// C+I 2 + Electrolyte (cathode) Cell # 2 : K (anode) // NCPE film// MnO 2 +C + Electrolyte (cathode) Open Circuit Voltage (OCV) values ~ 2.18 & ~ 2.08, have been obtained for Cells # 1 & # 2 respectively. The cell performance has been studied at room temperature by recording cell potential discharge profiles with time under different load conditions. Some important cell parameters have been evaluated in the plateau region of the discharge profiles.
![Research paper thumbnail of Investigations on materials and ion transport properties of Zn2+ conducting nano-composite polymer electrolytes (NCPEs): [(90 PEO: 10 Zn(CF3SO3)2)+ x ZnO]](https://attachments.academia-assets.com/78578693/thumbnails/1.jpg)
](Materials Today Communications
Non-lithium chemical based NCPE films: [90PEO: 10Zn(CF3SO3)2]+ 5% ZnO investigated. Enhanceme... more Non-lithium chemical based NCPE films: [90PEO: 10Zn(CF3SO3)2]+ 5% ZnO investigated. Enhancement in σrt and t+ has been achieved from SPE. Dry polymer electrolytes can be used for All-Solid-State battery applications. NCPE films have been casted by hot-press technique.
International Journal of Hydrogen Energy
Abstract A liquid electrolyte based on binary solvent systems of ethylene carbonate (EC), dimethy... more Abstract A liquid electrolyte based on binary solvent systems of ethylene carbonate (EC), dimethyl carbonate (DMC) and lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt incorporating with acrylic acid (AA) monomer was synthesized. The ionic conductivity studies revealed that the conductivity of the liquid electrolyte was enhanced from 2.16 × 10−3 to 2.24 × 10−3 S cm−1 at room temperature after the addition of 0.1 mol/kg AA due to the presence of a carbonyl group in AA structure. The viscosity and the temperature dependence of the ionic conductivity followed an Arrhenius equation. Interactions of the EC/DMC, LiTFSI and AA were characterized by Fourier transform infrared spectroscopy analysis. The electrochemical performance of the liquid electrolyte towards electric double layer capacitor (EDLC) was investigated using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. EDLC performances demonstrated that the supercapacitors exhibited specific capacitance ∼24.01 F/g at 5 mV/s. The life cycle test revealed that supercapacitor cell incorporated with synthesized liquid electrolyte possessed excellent stability and coulombic efficiency even after 4000 cycles.
Ionics
Green solid polymer electrolytes have drawn attention as multifunctional electrolyte as compared ... more Green solid polymer electrolytes have drawn attention as multifunctional electrolyte as compared to liquid electrolyte due to their flexibility membranes. In the present work, biodegradable iota-carrageenan polymer has been chosen as the host polymer with magnesium tri-fluromethanesulfonate (MgTf2) as the salt. The polymer film was incorporated with methyl-trioctylammonium bis(trifluoromethyl sulfonyl)imide (AmNTFSI) ionic liquid to amplify the ionic conductivity via adding mobile cations and tuning the crystallinity as well as the glass temperature of the polymer. Upon the incorporation of AmNTFSI, the ionic conductivity was remarkably augmented from (1.24 + 0.01) × 10−6 S cm−1 to the maximum value of (3.20 + 0.01) × 10−3 S cm−1 at room temperature. The thermal, structural, and temperature dependence conductivity measurements of polymer films (with and without AmNTFSI) have been analyzed, and the performance as the supercapacitor electrolytes has been evaluated.
Journal of Physics D: Applied Physics
Synthesis and characterization of ion transport behavior in Cu2+-conducting nano composite polyme... more Synthesis and characterization of ion transport behavior in Cu2+-conducting nano composite polymer electrolyte (NCPE) films: [90PEO: 10Cu(CF3SO3)2] + x CuO have been reported. NCPE films have been formed by hot-press casting technique using solid polymer electrolyte (SPE) film composition: [90PEO: 10Cu(CF3SO3)2] as 1st-phase host and nanoparticles of CuO in varying wt.(%) as 2nd-phase active filler. SPE: [90PEO: 10Cu(CF3SO3)2] was identified earlier as highest conducting film with room temperature conductivity (σ rt) ~ 3.0 x 10−6 S cm−1, which is three orders of magnitude higher than that of pure polymer host PEO with σ rt ~ 3.2 × 10−9 S cm−1. Filler particle concentration dependent conductivity study revealed NCPE film: [90PEO: 10Cu(CF3SO3)2] + 3%CuO as optimum conducting composition (OCC) exhibiting σ rt ~ 1.14 × 10−5 S cm−1. Hence, by the fractional dispersal of 2nd-phase active filler into 1st-phase SPE host, σ-enhancement of approximately an order of magnitude has further been obtained. Ion transport behavior in NCPE OCC film has been characterized in terms of basic ionic parameters viz. ionic conductivity (σ), total ionic transference (t ion)/cationic (t +) numbers. Temperature dependent conductivity measurement has also been done to explain the mechanism of ion transport and to compute activation energy (E a). Materials characterization and hence, confirmation of complexation of salt in polymeric host and/or dispersal of filler particles in SPE host have been done by scanning electron microscopy (SEM), energy dispersive x-ray spectrometer (EDS), x-ray diffraction (XRD), Fourier transform infra-red (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). All-solid-state battery in the cell configuration: Cu (Anode) || SPE host/NCPE OCC film || C + I2 + Electrolyte) (Cathode) has been fabricated and cell performance has been studied under two load resistances viz. 60 and 100 kΩ. Each NCPE cell gave on an open circuit voltage (OCV) ~ 0.68 V. Some important battery parameters have also been evaluated from the plateau regions of cell potential discharge profiles.
![Research paper thumbnail of Conductivity enhancement in K + -ion conducting dry Solid Polymer Electrolyte (SPE): [PEO: KNO 3 ]: A consequence of KI dispersal and nano-ionic effect](https://attachments.academia-assets.com/78578692/thumbnails/1.jpg)
](Materials Chemistry and Physics, 2017
Non-lithium chemical based SPE films: [95PEO:5KNO 3 ] & [70PEO:30-KNO 3 ] investigated. Substanti... more Non-lithium chemical based SPE films: [95PEO:5KNO 3 ] & [70PEO:30-KNO 3 ] investigated. Substantial enhancement in s rt and t þ achieved adopting two approaches. As first approach, CPEs prepared dispersing IInd-phase active filler into Ist-phase SPE. As second approach, Nanoeionic effect introduced by ball milling prior to casting CPE film. Dry polymer electrolytes can be used for All-Solid-State battery applications.
Ionics, 2017
Characterization of ion transport property in dry solid polymer electrolyte (SPE) films: [PEO: Zn... more Characterization of ion transport property in dry solid polymer electrolyte (SPE) films: [PEO: Zn(CF3SO3)2] in different salt wt% ratio has been reported. SPE films have been prepared by a hot-press casting procedure. Salt concentration dependent conductivity study at room temperature identified SPE film: [90PEO: 10 Zn(CF3SO3)2] as optimum conducting composition (OCC) with σrt ~ 1.09 × 10−6 S/cm which is approximately three orders of magnitude higher than that of pure PEO host (σrt ~ 3.20 × 10−9 S/cm). The reason attributed for σrt enhancement has been the increase in degree of amorphous phase in polymeric host after salt complexation. This has been confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), and polarized optical microscopy (POM) analysis. To evaluate the usefulness of SPE OCC film in all-solid-state-battery applications, ion transport property has been characterized in terms of basic ionic parameters viz. ionic conductivity (σ) and total ionic (tion)/cation (t+) transport numbers. Mechanism of ion transport has been explained by temperature dependent conductivity measurements and the activation energy (Ea) has been computed by least square linear fitting of “log σ − 1/T” Arrhenius plot.
New Journal of Chemistry, 2022
Graphene prepared through exfoliation process was printed on paper substrate using inkjet-printer... more Graphene prepared through exfoliation process was printed on paper substrate using inkjet-printer and then printed paper electrode was used as an electrochemical sensor for analysis of H2O2 in cyclic voltammetry.
Microchemical Journal, 2020
Development of low-cost paper based disposable electrodes printed with silver nano-ink using desk... more Development of low-cost paper based disposable electrodes printed with silver nano-ink using desktop inkjet printer is reported in this work. A stable nano-ink was prepared by dissolving 3% silver nanoparticles (AgNPs) capped with polyvinylpyrrolidone (PVP) in ethanol as a dispersing solvent. Highly stable silver nano-ink with surface tension of 21.1 mN/M and viscosity of 2.6 mPa.S was prepared for printing on photo paper that can be used as an electrode for electrochemical analyses. The fabricated paper electrode was exploited as a counter electrode in cyclic voltammetry (CV) analysis of potassium ferricyanide with better stability and reproducibility (relative standard deviation (RSD) 1.6%) for multiple times of analyses (n = 60) and compared with the results of conventional electrodes. Further, the printed paper electrode was demonstrated to be used as a working electrode for analysis of nitrate by CV. The use of paper electrode is found to be simple, rapid, user-friendly and can be applied at the sample source for determination of nitrate from different samples.
Journal of Materials Research, Mar 16, 2023
354-357Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(... more 354-357Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1-x)PEO: xAg(ClO4)], where x = 0, 2, 4, 6, 8, 10, 15, 20 wt. (%), has been studied. SPE films of uniform thickness ~100-150 mm have been casted by hot-press technique. The conductivity dependent on salt concentration has been measured and SPE film: [85PEO: 15 Ag (ClO4)] has been identified as Optimum Conducting Composition (OCC) with room temperature conductivity (s) ~ 5.64 10-6 S/cm. The characterization of materials and ion transport properties in SPE OCC film have been done. In order to understand the ion transport mechanism, conductivity (σ), total ionic transference number (tion) and cation (Ag+) transport number (<i style="mso-bidi-font-style: normal">t+) have been determined using <i style="mso-bidi-font-style: normal">ac impedance, dc polarization and combined ac/dc techniques, respectively. The temperature dependent conductivity has also been meas...
320-323Ion transport properties of Mg2+-ion conducting nano composite polymer electrolyte (NCPE) ... more 320-323Ion transport properties of Mg2+-ion conducting nano composite polymer electrolyte (NCPE) films have been investigated. NCPE membranes were cast by a completely dry/solution free hot-press technique. Solid Polymer Electrolyte (SPE) composition: [85PEO: 15Mg(ClO4)2], identified as the highest conducting film in a separate study with room temperature conductivity σ ~ 2.2710-6 S /cm, has been used as Ist-phase host matrix and different active (<span style="mso-ansi-language:EN-IN; mso-fareast-language:EN-IN">micro/nano-sized MgO) and passive (nano-sized SiO2 and <span style="mso-ansi-language: EN-IN;mso-fareast-language:EN-IN">TiO2) filler particles as IInd-phase dispersoid. Effect of fillers of different nature on ionic conductivity has been studied. As a consequence of dispersal of filler particles in fractional amount, conductivity (σ) enhancement of approximately one order of magnitude could be achieved at room temperature along with substanti...
Solid State Ionics, 2011
Materials and ion transport property characterization in Solid Polymer Electrolyte (SPE) membrane... more Materials and ion transport property characterization in Solid Polymer Electrolyte (SPE) membranes: (1−x) PEO: x KIO3, where x=0, 10, 20, 30, 40, 50wt.%, have been studied. SPE films have been prepared following two casting techniques: a novel hot-press (extrusion) and the traditional solution cast. Hot-press technique is a completely dry/solvent free/rapid/inexpensive procedure as compared to solution cast method and has recently been receiving wider acceptability to cast membranes of ion conducting polymeric electrolytes.‘Log σ−x’ study revealed σ-maxima at salt concentration x=30wt.% for SPE film prepared by both the methods. However, hot-pressed SPE film: 70 PEO: 30 KIO3 exhibited relatively higher room temperature conductivity (σ∼4.40×10−7Scm−1) than that of the solution casted film. This has been referred to as Optimum Conducting Composition (OCC) SPE film. Materials characterization in OCC SPE film has been done by XRD, FTIR and DSC techniques. These studies confirmed the complexation of salt in the polymeric host. Some basic ionic parameters viz. conductivity (σ), ionic mobility (μ), mobile ion concentration (n), ionic transference number (tion) have been determined using different experimental procedures to understand the ion transport behaviour in OCC SPE material. The temperature dependent conductivity measurement has also been carried out and the activation energy (Ea) has been computed from the linear least square fitting of ‘log σ−1/T’ Arrhenius plot.
New Journal of Physics, 2008
... Phys. 57 123 [15] Chandra S, Tolpadi SK and Hashmai SA 1988 Solid State Ion. 2830 651 [16] C... more ... Phys. 57 123 [15] Chandra S, Tolpadi SK and Hashmai SA 1988 Solid State Ion. 2830 651 [16] Chandra S, Hashmai SA, Saleem M and Agrawal RC 1993 Solid State Ion. ... 701 43 Maier J 1995 Proc. Solid State Chem. 23 171 [18] Agrawal RC and Gupta RK 1999 J. Mater. Sci. ...
Journal of Solid State Electrochemistry
Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1−x)PEO... more Ion transport in poly (ethylene oxide) based Solid Polymer Electrolyte (SPE) membranes: [(1−x)PEO: xAg(ClO4)], where x = 0, 2, 4, 6, 8, 10, 15, 20 wt. (%), has been studied. SPE films of uniform thickness ~100-150 μm have been casted by hot-press technique. The conductivity dependent on salt concentration has been measured and SPE film: [85PEO: 15 Ag (ClO4)] has been identified as Optimum Conducting Composition (OCC) with room temperature conductivity (σ) ~ 5.64× 10 S/cm. The characterization of materials and ion transport properties in SPE OCC film have been done. In order to understand the ion transport mechanism, conductivity ( ), total ionic transference number (tion) and cation (Ag ) transport number (t+) have been determined using ac impedance, dc polarization and combined ac/dc techniques, respectively. The temperature dependent conductivity has also been measured to evaluate the activation energy (Ea) from the linear least square fitting of ‘log −1/T’ Arrhenius plot. All-sol...
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Solid Polymer Electrolyte (SPE) films, based on poly (ethylene oxide) PEO complexed with Silver A... more Solid Polymer Electrolyte (SPE) films, based on poly (ethylene oxide) PEO complexed with Silver Acetate (AgCOOCH3) in different salt concentrations (x)= 0,3,5,7,10,15,20,25,30 wt.(%), have been prepared using hot press cast. Saltconcentration dependent conductivity study identified SPE film: [93PEO: 7AgCOOCH3] as Optimum Conducting Composition (OCC) with room temperature conductivity (σrt) ~ 1.13 x 10 -7 S/cm, which is approximately two orders of magnitude higher than that of pure PEO (σrt ~ 3.20 x 10 -9 S/cm). The complexation of salt in polymeric host has been confirmed by XRD/FTIR/SEM/DSC studies. Ion transport property has been characterized in terms of ionic conductivity (), total ionic (tion) / cation (t+) transport numbers. Temperature dependent conductivity has also been measured to understand ion transport mechanism and to compute activation energy (Ea) by least square linear fitting of ‘log σ1/T’ Arrhenius plot. Keywords— Solid Polymer Electrolyte (SPE), Hot-press Casting...
1 , has been used as the I st – phase host matrix and SiO2 filler particles of nano-dimension (~ ... more 1 , has been used as the I st – phase host matrix and SiO2 filler particles of nano-dimension (~ 8 nm) as II nd – phase dispersoid. The fractional dispersal of SiO2 filler (viz. x = 5 wt. %) in I st – phase SPE host resulted into nearly three fold increase in the room temperature conductivity. This NCPE film: (70PEO: 30 KNO3) + 5 SiO2 has been referred to as Optimum Conducting Composition (OCC) NCPE film. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared (FTIR) techniques have been used to study the morphological, structural, thermal and spectroscopic responses respectively of NCPE OCC film material. The ion transport behaviour has been characterized in terms of basic ionic parameters viz. conductivity (), mobility (μ), mobile ion concentration (n) and ionic transport number (tion). The frequency dependent dielectric response has also been studied in the temperature range 303-353 K. The newly synthesi...
Ion transport properties of Mg 2+ -ion conducting nano composite polymer electrolyte (NCPE) films... more Ion transport properties of Mg 2+ -ion conducting nano composite polymer electrolyte (NCPE) films have been i nvestigated. NCPE membranes were cast by a completely dry/solution free hot-press technique. Solid Polymer Electrolyte (SPE) composition: [85PEO: 15Mg(ClO4)2], identified as the highest conducting film in a separate study with room t emperature conductivity � ~ 2.27×10 -6 S /cm, has been used as I st -phase host matrix and different active (micro/nano-sized M gO) and passive (nano-sized SiO2 and TiO2) filler particles as II nd -phase dispersoid. Effect of fillers of different nature on i onic conductivity has been studied. As a consequence of dispersal of filler particles in fractional amount, conductivity (�) enhancement of approximately one order of magnitude could be achieved at room temperature along with substantial improvement in the mechanical integrity of the film. The total ionic transference number (tion) and the cationic (Mg 2+ ) t ransference number (t+) have bee...
Ionics
Poly (ethylene oxide) (PEO) based Nano-Composite Polymer Electrolyte (NCPE) membranes: (70PEO: 30... more Poly (ethylene oxide) (PEO) based Nano-Composite Polymer Electrolyte (NCPE) membranes: (70PEO: 30KNO 3) + x SiO 2 , where x = 0, 1, 2, 3, 5, 8, 10, 12 wt. (%), have been casted by hot-press/ solution free technique. Solid Polymer Electrolyte (SPE) composition: (70PEO: 30 KNO 3) (wt. %), reported earlier as highest conducting film with room temperature conductivity ( rt) ~ 3.98 x 10-7 Scm-1 , has been used as the I stphase host matrix and SiO 2 filler particles of nano-dimension (~ 8 nm) as II ndphase dispersoid. The fractional dispersal of SiO 2 filler (viz. x = 5 wt. %) in I stphase SPE host resulted into nearly three fold increase in the room temperature conductivity. This NCPE film: (70PEO: 30 KNO 3) + 5 SiO 2 has been referred to as Optimum Conducting Composition (OCC) NCPE film. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared (FTIR) techniques have been used to study the morphological, structural, thermal and spectroscopic responses respectively of NCPE OCC film material. The ion transport behaviour has been characterized in terms of basic ionic parameters viz. conductivity (), mobility (µ), mobile ion concentration (n) and ionic transport number (t ion). The frequency dependent dielectric response has also been studied in the temperature range 303-353 K. The newly synthesized NCPE OCC membrane has been sandwiched between K-metal anode and different cathodes to fabricate all-solid-state battery having following cell configurations: Cell # 1 : K (anode) // NCPE film// C+I 2 + Electrolyte (cathode) Cell # 2 : K (anode) // NCPE film// MnO 2 +C + Electrolyte (cathode) Open Circuit Voltage (OCV) values ~ 2.18 & ~ 2.08, have been obtained for Cells # 1 & # 2 respectively. The cell performance has been studied at room temperature by recording cell potential discharge profiles with time under different load conditions. Some important cell parameters have been evaluated in the plateau region of the discharge profiles.
Materials Today Communications
Non-lithium chemical based NCPE films: [90PEO: 10Zn(CF3SO3)2]+ 5% ZnO investigated. Enhanceme... more Non-lithium chemical based NCPE films: [90PEO: 10Zn(CF3SO3)2]+ 5% ZnO investigated. Enhancement in σrt and t+ has been achieved from SPE. Dry polymer electrolytes can be used for All-Solid-State battery applications. NCPE films have been casted by hot-press technique.
International Journal of Hydrogen Energy
Abstract A liquid electrolyte based on binary solvent systems of ethylene carbonate (EC), dimethy... more Abstract A liquid electrolyte based on binary solvent systems of ethylene carbonate (EC), dimethyl carbonate (DMC) and lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt incorporating with acrylic acid (AA) monomer was synthesized. The ionic conductivity studies revealed that the conductivity of the liquid electrolyte was enhanced from 2.16 × 10−3 to 2.24 × 10−3 S cm−1 at room temperature after the addition of 0.1 mol/kg AA due to the presence of a carbonyl group in AA structure. The viscosity and the temperature dependence of the ionic conductivity followed an Arrhenius equation. Interactions of the EC/DMC, LiTFSI and AA were characterized by Fourier transform infrared spectroscopy analysis. The electrochemical performance of the liquid electrolyte towards electric double layer capacitor (EDLC) was investigated using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. EDLC performances demonstrated that the supercapacitors exhibited specific capacitance ∼24.01 F/g at 5 mV/s. The life cycle test revealed that supercapacitor cell incorporated with synthesized liquid electrolyte possessed excellent stability and coulombic efficiency even after 4000 cycles.
Ionics
Green solid polymer electrolytes have drawn attention as multifunctional electrolyte as compared ... more Green solid polymer electrolytes have drawn attention as multifunctional electrolyte as compared to liquid electrolyte due to their flexibility membranes. In the present work, biodegradable iota-carrageenan polymer has been chosen as the host polymer with magnesium tri-fluromethanesulfonate (MgTf2) as the salt. The polymer film was incorporated with methyl-trioctylammonium bis(trifluoromethyl sulfonyl)imide (AmNTFSI) ionic liquid to amplify the ionic conductivity via adding mobile cations and tuning the crystallinity as well as the glass temperature of the polymer. Upon the incorporation of AmNTFSI, the ionic conductivity was remarkably augmented from (1.24 + 0.01) × 10−6 S cm−1 to the maximum value of (3.20 + 0.01) × 10−3 S cm−1 at room temperature. The thermal, structural, and temperature dependence conductivity measurements of polymer films (with and without AmNTFSI) have been analyzed, and the performance as the supercapacitor electrolytes has been evaluated.
Journal of Physics D: Applied Physics
Synthesis and characterization of ion transport behavior in Cu2+-conducting nano composite polyme... more Synthesis and characterization of ion transport behavior in Cu2+-conducting nano composite polymer electrolyte (NCPE) films: [90PEO: 10Cu(CF3SO3)2] + x CuO have been reported. NCPE films have been formed by hot-press casting technique using solid polymer electrolyte (SPE) film composition: [90PEO: 10Cu(CF3SO3)2] as 1st-phase host and nanoparticles of CuO in varying wt.(%) as 2nd-phase active filler. SPE: [90PEO: 10Cu(CF3SO3)2] was identified earlier as highest conducting film with room temperature conductivity (σ rt) ~ 3.0 x 10−6 S cm−1, which is three orders of magnitude higher than that of pure polymer host PEO with σ rt ~ 3.2 × 10−9 S cm−1. Filler particle concentration dependent conductivity study revealed NCPE film: [90PEO: 10Cu(CF3SO3)2] + 3%CuO as optimum conducting composition (OCC) exhibiting σ rt ~ 1.14 × 10−5 S cm−1. Hence, by the fractional dispersal of 2nd-phase active filler into 1st-phase SPE host, σ-enhancement of approximately an order of magnitude has further been obtained. Ion transport behavior in NCPE OCC film has been characterized in terms of basic ionic parameters viz. ionic conductivity (σ), total ionic transference (t ion)/cationic (t +) numbers. Temperature dependent conductivity measurement has also been done to explain the mechanism of ion transport and to compute activation energy (E a). Materials characterization and hence, confirmation of complexation of salt in polymeric host and/or dispersal of filler particles in SPE host have been done by scanning electron microscopy (SEM), energy dispersive x-ray spectrometer (EDS), x-ray diffraction (XRD), Fourier transform infra-red (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). All-solid-state battery in the cell configuration: Cu (Anode) || SPE host/NCPE OCC film || C + I2 + Electrolyte) (Cathode) has been fabricated and cell performance has been studied under two load resistances viz. 60 and 100 kΩ. Each NCPE cell gave on an open circuit voltage (OCV) ~ 0.68 V. Some important battery parameters have also been evaluated from the plateau regions of cell potential discharge profiles.
Materials Chemistry and Physics, 2017
Non-lithium chemical based SPE films: [95PEO:5KNO 3 ] & [70PEO:30-KNO 3 ] investigated. Substanti... more Non-lithium chemical based SPE films: [95PEO:5KNO 3 ] & [70PEO:30-KNO 3 ] investigated. Substantial enhancement in s rt and t þ achieved adopting two approaches. As first approach, CPEs prepared dispersing IInd-phase active filler into Ist-phase SPE. As second approach, Nanoeionic effect introduced by ball milling prior to casting CPE film. Dry polymer electrolytes can be used for All-Solid-State battery applications.
Ionics, 2017
Characterization of ion transport property in dry solid polymer electrolyte (SPE) films: [PEO: Zn... more Characterization of ion transport property in dry solid polymer electrolyte (SPE) films: [PEO: Zn(CF3SO3)2] in different salt wt% ratio has been reported. SPE films have been prepared by a hot-press casting procedure. Salt concentration dependent conductivity study at room temperature identified SPE film: [90PEO: 10 Zn(CF3SO3)2] as optimum conducting composition (OCC) with σrt ~ 1.09 × 10−6 S/cm which is approximately three orders of magnitude higher than that of pure PEO host (σrt ~ 3.20 × 10−9 S/cm). The reason attributed for σrt enhancement has been the increase in degree of amorphous phase in polymeric host after salt complexation. This has been confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), and polarized optical microscopy (POM) analysis. To evaluate the usefulness of SPE OCC film in all-solid-state-battery applications, ion transport property has been characterized in terms of basic ionic parameters viz. ionic conductivity (σ) and total ionic (tion)/cation (t+) transport numbers. Mechanism of ion transport has been explained by temperature dependent conductivity measurements and the activation energy (Ea) has been computed by least square linear fitting of “log σ − 1/T” Arrhenius plot.