Thermal and transport properties of the polymer electrolyte based on poly(vinyl alcohol)–KOH–H2O

Palacios, I.; Castillo, Roberto; Vargas, R.A.

doi:10.1016/s0013-4686(03)00204-4

Cited by 37 publications

(18 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This finding, as well as the observation that the temperature of the anomalies shifts upward show that the alumina stabilized the polymer. These results agree with the literature reports [3,18,19]; in other words, the glass transition temperature of PVAL is strongly sensitive to doping. characteristics of the water removal: The onset of liberation of superficial water is around 50 °C (provided that the atmosphere is dry) and the process continues up to 95 °C.…”

Section: Experimental Methodssupporting

confidence: 93%

See 1 more Smart Citation

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O

Fernández

Diosa

Vargas

et al. 2007

Phys. Status Solidi (c)

View full text Add to dashboard Cite

In this work we report the preparation of membranes based on poly (vinyl alcohol) (PVAL), lithium hydroxide, alumina, and water with different alumina concentrations. The samples were characterized by impedance spectroscopy, differential scanning calorimetry (DSC), thermogravimetry, and x-ray diffraction. The DSC thermograms show three anomalies after the first thermal treatment, the first one as a downward jump at around 20 °C, associated to the glass transition of the polymer, the second one as an endothermic peak around 210 o C associated to the polymer melting point, and the third one as an endothermic peak around 235 o C associated to the decomposition process. The results show that the glass transition temperature is strongly sensitive to the alumina content. Impedance results show a dielectric relaxation that disappears with increasing alumina concentration. The X-ray diffraction shows that the amorphous part of the composite increases as the alumina concentration increases, indicating an approximation effect of the dispersed ceramic nanoparticles in the polymer matrix. These results can be interpreted by considering the Hodge et al. criterion, which establishes a correlation between the height of this peak an the degree of crystallinity of PVAL.

show abstract

Section: Experimental Methodssupporting

confidence: 93%

“…Palacios et al reported previously [3] the dissolution of KOH in poly(vinyl alcohol) and water resulting in proton conductor polymer membranes with the highest room temperature conductivity in the order of 10 -3 Scm -1 . Fernández et al [4] studied by thermal and electrical measurements of solid polymer electrolyte mem-…”

Section: Introductionmentioning

confidence: 99%

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O

Fernández

Diosa

Vargas

et al. 2007

Phys. Status Solidi (c)

View full text Add to dashboard Cite

show abstract

“…Arof et al produced poly(vinyl alcohol)-KOH blend alkaline electrolytes with conductivities < 10 -5 S cm -1 for a nickel-zinc cells [83]. Vargas et al also studied PVA-KOH electrolytes and obtained conductivities up to 2.3 x 10 -3 S cm -1 for application in humidity sensors and alkaline batteries [84]. Sun et al studied highly conductive poly(sodium acrylate) / tetramethylammonium hydroxide blends and mentioned AFCs as a potential application [85].…”

Section: Review Of Other Relevant Aaem Systemsmentioning

confidence: 99%

Prospects for Alkaline Anion‐Exchange Membranes in Low Temperature Fuel Cells

Varcoe¹,

2005

View full text Add to dashboard Cite

This article introduces the radical approach of applying alkaline anion-exchange membranes (AAEMs) to meet the current challenges with regards to direct methanol fuel cells (DMFCs).A review of the literature is presented with regards to the testing of fuel cells with alkaline membranes (fuelled with hydrogen or methanol) and also to candidate alkaline anionexchange membranes for such an application. A brief review of the directly related patent literature is also included. Current and future research challenges are identified along with potential strategies to overcome them. Finally, the advantages and challenges with the direct electrochemical oxidation of alternative fuels are discussed, along with how the application of alkaline membranes in such fuel cells may assist in improving performance and fuel efficiency. KeywordsLow temperature, Alkaline anion-exchange membrane, Direct methanol fuel cell, Polymer electrolyte fuel cell.

show abstract

“…The results show that dc conductivity values decrease with increasing temperature in the range where the membranes release water as noted in the results of TGA (see Figure 3) indicating that the proton transport membranes is provided in regions containing water that form a liquid phase or aqueous solution with H 3 PO 2 . This liquid phase coexists with a solid phase of the reinforced polymer, consisting of PVA, the acid which is not dissolved in the liquid phase, and the dispersed TiO 2 particles, as discussed in references [9] and [18] for similar…”

mentioning

confidence: 97%

“…This new combination allowed the production of non-perfluoronated membranes of low cost and good procesability, encouraging manufacturing different types of PEMs, which have been synthetized using mixtures of polymers with various salts and acids [8]. Other groups have investigated various combinations using PVA as polymeric matrix [8], [9], [10], [11], [12]. On the other hand, composites have been synthetized based on polymeric membranes combined with micro or nanoparticles for the purpose of controlling the physical and chemical properties, being in some cases that this approach has improved proton conductivity and mechanical properties for some dispersant concentrations [13], [14], [15], [16].…”

mentioning

confidence: 99%

Improvement of Proton-ExchangeMembranes Based on(1x)(H3PO2/PVA)-xTiO2

et al. 2017

View full text Add to dashboard Cite

Using impedance spectroscopy (IS), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and infrared spectroscopy (IR) techniques to study the polymer electrolyte membranes based on poly(vinyl alcohol) (PVA) and hypophosphorous acid (H3PO2) with different titanium oxide nanoparticles (TiO2) concentrations. The polymer systems (1−x)(H3PO2/ PVA) + xTiO2 were prepared using the sol-casting method and different weight percent of TiO2, x ≤ 10.0 . The DSC results show that the glass transition for molar fraction P/OH = 0.3 appears around 153|Improvement of proton-exchange membranes based on (1 − x)(H3PO2/PVA)-xTiO2 75℃ and for the samples doped with TiO2 around 35℃; the melting point for all membranes appear around 175℃. The FTIR spectra show changes in the profiles of the absorption bands with the addition of H3PO2 and the different concentrations of TiO2. The IS results show dielectric and conductivity relaxations as well as a change in DC ionic conductivity with the TiO2 content. The order of the ionic conductivity is about 10 −2 S/cm for 5.0 of TiO2. The TGA in the heating run shows water loss that is in agreement with DC conductivity measurements.

show abstract

Thermal and transport properties of the polymer electrolyte based on poly(vinyl alcohol)–KOH–H2O

Cited by 37 publications

References 10 publications

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O

Prospects for Alkaline Anion‐Exchange Membranes in Low Temperature Fuel Cells

Improvement of Proton-ExchangeMembranes Based on(1x)(H3PO2/PVA)-xTiO2

Contact Info

Product

Resources

About

Thermal and transport properties of the polymer electrolyte based on poly(vinyl alcohol)–KOH–H2O

Cited by 37 publications

References 10 publications

New polymer electrolyte based on PVAL‐LiOH‐Al2O3‐H2O

New polymer electrolyte based on PVAL‐LiOH‐Al2O3‐H2O

Prospects for Alkaline Anion‐Exchange Membranes in Low Temperature Fuel Cells

Improvement of Proton-ExchangeMembranes Based on(1x)(H3PO2/PVA)-xTiO2

Contact Info

Product

Resources

About

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O

New polymer electrolyte based on PVAL‐LiOH‐Al₂O₃‐H₂O