Effect of nano-composite on polyvinyl alcohol-based proton conducting membrane for direct methanol fuel cell applications

Palani, P. Bahavan; Kannan, R.; Rajashabala, S.; Rajendran, S.; Velraj, G.

doi:10.1007/s11581-014-1193-1

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…Similar observation also can be found elsewhere. 38 Ion exchange capacity (IEC) Fig. 7 presents the ion exchange capacity (IEC) results for chitosan and Ch/G-MMT composite membranes.…”

Section: Thermal Stability Analysismentioning

confidence: 99%

Biopolymer-based electrolyte membranes from chitosan incorporated with montmorillonite-crosslinked GPTMS for direct methanol fuel cells

et al. 2016

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“…Similar observation also can be found elsewhere. 38 Ion exchange capacity (IEC) Fig. 7 presents the ion exchange capacity (IEC) results for chitosan and Ch/G-MMT composite membranes.…”

Section: Thermal Stability Analysismentioning

confidence: 99%

Biopolymer-based electrolyte membranes from chitosan incorporated with montmorillonite-crosslinked GPTMS for direct methanol fuel cells

et al. 2016

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“…They account for the anomalous reduction of water uptake to sulfonic groups (—SO 3 H) immobilization of PVA membrane. When SO 3 H and PVA interact, the polymer structure becomes more rigid and dense, lowering the free volume capacity for water molecules 18 . Apart from that, the researchers noticed a possible blocking impact due to the presence of SO 3 H/PVA interactions, which could indicate a decrease in water intake due to a low‐swelling ability 30 …”

Section: Resultsmentioning

confidence: 99%

“…Because of their low cost, outstanding film‐synthetic properties, extremely hydrophilic properties, and excellent oxidative and hydrolytic stability, PVA‐based membranes have emerged as the most promising electrolytes for hydrogen‐oxygen fuel cells 17 . They also outperformed Nafion in terms of methanol barrier properties 18 . PVA's conductivity and mechanical strength, on the other hand, are undesirable because they do not have fixed negative charges such as sulfonic and carboxylic acid groups and swell quickly in water 19 .…”

Section: Introductionmentioning

confidence: 99%

“…17 They also outperformed Nafion in terms of methanol barrier properties. 18 PVA's conductivity and mechanical strength, on the other hand, are undesirable because they do not have fixed negative charges such as sulfonic and carboxylic acid groups and swell quickly in water. 19 As a result, the proton conductivity, and swelling properties of the PVA membrane in an aqueous solution must be improved while the other features are preserved.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of transport mechanism and nanostructure of nonperfluorinated PVA/sPTA proton exchange membrane for fuel cell application

Awad

Abdel-Hady

Hamed

et al. 2022

Polymers for Advanced Techs

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Polyvinyl alcohol (PVA) with sulfophthalic acid (sPTA) as a proton exchange membrane (PEM) for fuel cell applications was prepared by the solvent casting method.The fabricated membranes were obtained by varying the concentration of sPTA from 5 to 30 wt.% of PVA and thermally crosslinked at a temperature of 100 C for 1 h.Crosslinked PVA/sPTA membranes were characterized by FTIR spectroscopy, scanning electron microscopy (SEM), and wide-angle X-ray diffraction (XRD). The transport properties were investigated by determining ion exchange capacity (IEC), water uptake, methanol permeability, and proton conductivity. Free volume hole size and its distribution of crosslinked PVA membrane were measured by positron annihilation lifetime spectroscopy (PALS). With an increase in sPTA concentration in the PVA membrane, both IEC and proton conductivity increased, but water uptake and methanol permeability decreased. At room temperature, IEC values were increased from 0.3 to 1.6 meq/g, and proton conductivity varied from 0.2 to 3.5 S/cm. According to PALS data, increasing the sPTA content causes the free volume content of crosslinked PVA membranes to decrease. The results were analyzed and presented in the context of free volume theory, in which the concentrations of nanostructure free volume defects are related to the membrane's transport capabilities.

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“…The procedure for preparing modied MMT was reported in our previous work and is as follows. 20 The Na + MMT was dispersed in distilled water with continuous stirring for 24 h at room temperature. The well-dispersed solution was passed through the ion exchange resin several times.…”

Section: Membrane Preparation and Characterizationmentioning

confidence: 99%

Improvement of proton conductivity in nanocomposite polyvinyl alcohol (PVA)/chitosan (CS) blend membranes

et al. 2014

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Effect of nano-composite on polyvinyl alcohol-based proton conducting membrane for direct methanol fuel cell applications

Cited by 20 publications

References 43 publications

Biopolymer-based electrolyte membranes from chitosan incorporated with montmorillonite-crosslinked GPTMS for direct methanol fuel cells

Biopolymer-based electrolyte membranes from chitosan incorporated with montmorillonite-crosslinked GPTMS for direct methanol fuel cells

Evaluation of transport mechanism and nanostructure of nonperfluorinated PVA/sPTA proton exchange membrane for fuel cell application

Improvement of proton conductivity in nanocomposite polyvinyl alcohol (PVA)/chitosan (CS) blend membranes

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