Structural Modification of Polysulfone doped Cu2O Nanospheres

Sharma, Poonam

doi:10.17571/appslett.2015.01012

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…This represents the accumulation of space charge carriers at the interface of the ionically conducting SPE films and SS blocking electrode. The disappearance of the semicircular region in the impedance spectra after the addition of nanofiller leads to the conclusion that the total conductivity is due to the conduction of fast ion charge migration, so only a diffusion process takes place [72][73][74][75]. This also indicates that conduction is now supported by dispersed nanofiller with the surface group.…”

Section: Complex Impedance Spectroscopy (Cis) Analysismentioning

confidence: 99%

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Arya¹,

Sharma²

2018

J. Phys. D: Appl. Phys.

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The free standing solid polymer nanocomposite (PEO-PVC)+LiPF6-TiO2 films has been prepared through standard solution cast technique. The improvement in structural, microstructural and electrochemical properties has been observed on the dispersion of nanofiller in polymer salt complex. X-Ray diffraction studies clearly reflect the formation of complex formation as no corresponding salt peak appeared in the diffractograms. The FTIR analysis suggested a clear and convincing evidence of polymer-ion, ion-ion and polymer-ion-nanofiller interaction. The highest ionic conductivity of the prepared solid polymer electrolyte films is ~5×10 -5 S cm -1 for 7 wt. % TiO2.The Linear Sweep Voltammetry provide the electrochemical stability window of the prepared solid polymer electrolyte films, which is of the order of ~3.5 V. The ion transference number has been estimated, tion =0.99 through dc polarization technique. Dielectric spectroscopic studies were performed to understand the ion transport process in polymer electrolytes. All solid polymer electrolyte possesses good thermal stability up to 300 °C. DSC analysis confirms the decrease of melting temperature and signal of glass transition temperature with addition of nanofiller which indicates the decrease of crystallinity of polymer matrix. An absolute correlation between diffusion coefficient (D), ion mobility (μ), number density (n), double layer capacitance (Cdl), glass transition temperature, melting temperature (Tm), free ion area (%) and conductivity (σ) has been observed. A convincing model to study the role of nanofiller in polymer salt complex has been proposed which supports the experimental findings. The prepared polymer electrolyte system with significant ionic conductivity, high ionic transference number, good thermal, voltage stability could be suggested as a potential candidate as electrolyte cum separator for fabrication of rechargeable lithium-ion battery system. IntroductionFrom last two decades, lithium ion batteries (LIB) are widely investigated energy source for the portable electronics because of attractive features like high energy density, shape mouldability, design flexibility, zero memory loss and high safety. The desirable characteristics of polymer electrolytes for R&D application in LIB are good compatibility with electrode materials, leakage proof, longer shelf life, high capacity and light weight [1]. The conductivity in solid state conductors was reported first time by Faraday in 1800s, and later the discovery of poly ethylene oxide (PEO) and alkali metal salts (NaI) system in the 1970s was contributed by Wright and coworkers. Then, Armand realized their technological importance due to flexibility, deformability and introduced the first new class of solid state ionic conductors (SSIC). Solid Polymer electrolytes (SPEs) comprising the high electrical conductivity along with mechanical flexibility, faster segmental motion of polymer chain makes them, best substitute over liquid electrolytes in electrochemical devices such as supercapacitor, cell ...

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Section: Complex Impedance Spectroscopy (Cis) Analysismentioning

confidence: 99%

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Arya¹,

Sharma²

2018

J. Phys. D: Appl. Phys.

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“…free ions and ion pairs. So, to study above degeneracy and presence of both ions, deconvolution of the PF − 6 peak is undertaken, as explained somewhere [40,41].…”

Section: Fourier Transform Infra-red Spectroscopy (Ftir) Analysismentioning

confidence: 99%

Structural, electrical properties and dielectric relaxations in Na⁺-ion-conducting solid polymer electrolyte

Arya¹,

Sharma²

2018

J. Phys.: Condens. Matter

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In this paper, we have studied the structural, microstructural, electrical, dielectric properties and ion dynamics of a sodium-ion-conducting solid polymer electrolyte film comprising PEO-NaPF+ x wt. % succinonitrile. The structural and surface morphology properties have been investigated, respectively using x-ray diffraction and field emission scanning electron microscopy. The complex formation was examined using Fourier transform infrared spectroscopy, and the fraction of free anions/ion pairs obtained via deconvolution. The complex dielectric permittivity and loss tangent has been analyzed across the whole frequency window, and enables us to estimate the DC conductivity, dielectric strength, double layer capacitance and relaxation time. The presence of relaxing dipoles was determined by the addition of succinonitrile (wt./wt.) and the peak shift towards high frequency indicates the decrease of relaxation time. Further, relations among various relaxation times ([Formula: see text]) have been elucidated. The complex conductivity has been examined across the whole frequency window; it obeys the Universal Power Law, and displays strong dependency on succinonitrile content. The sigma representation ([Formula: see text]) was introduced in order to explore the ion dynamics by highlighting the dispersion region in the Cole-Cole plot ([Formula: see text]) in the lower frequency window; increase in the semicircle radius indicates a decrease of relaxation time. This observation is accompanied by enhancement in ionic conductivity and faster ion transport. A convincing, logical scheme to justify the experimental data has been proposed.

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Superparamagnetic Ni0.5Zn0.5Fe2O4 nanoparticles prepared by ball-milling

Yasin

2023

Appl. Phys. A

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Structural Modification of Polysulfone doped Cu2O Nanospheres

Cited by 3 publications

References 17 publications

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Structural, electrical properties and dielectric relaxations in Na⁺-ion-conducting solid polymer electrolyte

Superparamagnetic Ni0.5Zn0.5Fe2O4 nanoparticles prepared by ball-milling

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Structural Modification of Polysulfone doped Cu2O Nanospheres

Cited by 3 publications

References 17 publications

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Structural, electrical properties and dielectric relaxations in Na+-ion-conducting solid polymer electrolyte

Superparamagnetic Ni0.5Zn0.5Fe2O4 nanoparticles prepared by ball-milling

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Structural, electrical properties and dielectric relaxations in Na⁺-ion-conducting solid polymer electrolyte