Thermal, electrical and optical studies on the poly(vinyl alcohol) based polymer electrolytes

Hirankumar, G.; Selvasekarapandian, S.; Kuwata, Naoaki; Kawamura, J; Hattori, Takeshi

doi:10.1016/j.jpowsour.2004.12.019

Cited by 169 publications

(78 citation statements)

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“…This absorption peak may be attributed to the n ~ or* transition which is very sensitive to hydrogen bonding. A small peak around 208 nm for pure PVA can be attributed to the n ---, rt* transition and has been observed to be broad in the salt doped polymer electrolytes [6]. A new broad band obtained around 600-800 nm may be attributed to the absorption peak of Cu 2+.…”

Section: Experimental Descriptionmentioning

confidence: 86%

“…It has been already reported that the ambient temperature conductivity of pure PVA has been found to be 2 x 10 -l~ Scm I [6]. From the figure, it has been observed that the conductivity increases with the increase of the number of charge carriers by the addition of Cu(NO3) 2 and the conductivity has been found to be high, 1.6 x 10 -5 Scm -1 for 30 wt.% Cu(NO3) 2 doped polymer electrolyte at 303 K. This increase in conductivity with increasing temperature can be related to the increase in the number of mobile charge carriers contributing to the transport of ions.…”

Section: Conductivity Analysismentioning

confidence: 98%

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Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Ramya

Savitha

Selvasekarapandian

et al. 2005

Ionics

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Abstract. Copper-ion conducting solid-polymer electrolyte systems based on Polyvinyl alcohol (PVA) has been prepared by solution cast technique. UV-VIS data show a broad peak in the wavelength region 600-800 nm due to complex formation. The 30 wt.% Cu(NO3) 2 doped system has a maximum conductivity of 1.6 x 10 5 Scm 1 at room temperature. The conductance spectrum shows two distinct regions: a dc plateau and a dispersive region. The dielectric spectra show an increase in the dielectric constant with decreasing frequency. The transference number measurements reveal that the transport in these electrolytes is mainly due to ions.

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Section: Experimental Descriptionmentioning

confidence: 86%

Section: Conductivity Analysismentioning

confidence: 98%

Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Ramya

Savitha

Selvasekarapandian

et al. 2005

Ionics

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“…Compositional dependence parameters: From figure-10, it has been found that the conductivity increases with increasing NH 4 NO 3 concentration and reaches a maximum value at 20mol% (attributed to the increase in number of mobile charge carriers and also to the increase in amorphous nature of the polymer electrolyte) and there after decreases (due to the influence of ion pairs and ion aggregation leading to the formation of ion clusters) [18][19]. Figure-11 shows that FWHM is least for the PVA doped with 20mol% NH 4 Figure-12 shows that the highest conductivity polymer electrolyte (80PVA-20NH 4 NO 3 ) has the lowest activation energy (~0.19eV).It is noteworthy that the polymer electrolyte with low values of activation energies are desirable…”

Section: Free Ion Peak Area C O N C E N Tr a Tio N O F N H 4 N O 3 ( mentioning

confidence: 99%

Characterization of PVA–NH₄NO₃Polymer Electrolyte and Its Application in Rechargeable Proton Battery

et al. 2010

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The PVA-NH 4 NO 3 polymer electrolytes have been prepared by solvent casting technique and characterized by XRD, FTIR, DSC, Raman, 1 H NMR and ac impedance spectroscopic studies to find out best composition possessing good electrical and mechanical stability. Using the best optimum composition, proton battery with two different cell configurations have been constructed and subjected to rechargeability studies. In the present study rechargeability up to 3 cycles without significant loss in the voltage has been obtained for the cell with configuration Zn + ZnSO 4 .7H 2 O|80PVA: 20NH 4 NO 3 | V 2 O 5 +PbO 2 + C + PE.

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“…The spectra exhibit bands characteristic of stretching and bending vibrations of OAH, CAH, C¼ ¼C, and CAO groups. [13][14][15] From FTIR spectra, the band at 3484 cm À1 is assigned to OAH stretching vibration of hydroxyl groups of PVA. The band corresponding to CH 2 asymmetric stretching vibration occurs at 2938 cm À1 and CAH symmetric stretching vibration at 2853 cm À1 .…”

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confidence: 99%

“…This peak will be correlated with the magnetic properties. 15 Figure 3 shows the ultraviolet optical absorption spectra of pure PVA filled with different concentrations of CoBr 2 recorded at room temperature in the range of wavelength from 200-2000 nm. The absorption bands at 280 nm is assigned to p !…”

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confidence: 99%

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Elashmawi

Abdelrazek

2009

J of Applied Polymer Sci

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Polyvinyl alcohol (PVA) films filled with different concentrations of CoBr 2 were prepared using the casting method. These films were characterized by FTIR, UVvisible, XRD, and ESR techniques. FTIR spectra were used to clarify the structural variations due to the filling level from CoBr 2 . The observed bands at 3484, 1733, and 1640 cm À1 were assigned to OAH, C¼ ¼O, and C¼ ¼C stretching vibrations, respectively. UV-visible spectra shows the absorption band at 280 nm which is assigned to p ! p* transition. This indicates the presence of unsaturated bonds in tail to head of PVA. Optical energy gap decreased with increasing the concentration of CoBr 2 . X-ray diffraction scans show some decrease in the degree of crystallinity in the filled films which reveals an increase in amorphous phase of PVA due to the interaction between Co þ2 and polymeric matrix causing a molecular rearrangement within the amorphous phase of PVA. The observed complex ESR spectrum due to hyperfine interactions confirms the role of free radicals. Spectroscopic and magnetic properties of PVA/CoBr 2 composite films were investigated and compared with those of PVA alone. The results show that the change of the structure due to the interaction of filler with the polymer.

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Thermal, electrical and optical studies on the poly(vinyl alcohol) based polymer electrolytes

Cited by 169 publications

References 10 publications

Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Characterization of PVA–NH₄NO₃Polymer Electrolyte and Its Application in Rechargeable Proton Battery

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

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Thermal, electrical and optical studies on the poly(vinyl alcohol) based polymer electrolytes

Cited by 169 publications

References 10 publications

Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Transport mechanism of Cu-ion conducting PVA based solid-polymer electrolyte

Characterization of PVA–NH4NO3Polymer Electrolyte and Its Application in Rechargeable Proton Battery

Role of CoBr2 on the structural, optical and magnetic properties of polyvinyl alcohol films

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Product

Resources

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Characterization of PVA–NH₄NO₃Polymer Electrolyte and Its Application in Rechargeable Proton Battery

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films