Preparation of novel poly(vinyl alcohol)/SiO2 nanocomposite membranes by a sol–gel process and their application on alkaline DMFCs

Yang, Chun‐Chen; Li, Ying-Jeng James; Liou, Tzong-Horng

doi:10.1016/j.desal.2011.03.079

Cited by 75 publications

(32 citation statements)

References 23 publications

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“…Figure 3a closely resembles those discovered by other authors used different fillers (14,15). At low filler concentrations effect of filler content is positive.…”

Section: Effect Of Filler Contentsupporting

confidence: 87%

Polyvinyl Alcohol Based Nanocomposite Membranes Containing Aluminum Hydroxide Gel

2013

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Cross-linked PVA/Al(OH) 3 nanocomposite polymer membranes with a very small thickness were produced by diluted acidic solution casting. Dry and wet membranes were characterized by impedance spectroscopy and densitometry. Wet membranes had shown pure ionic conductivity of the order of 10 -3 S/cm at 90 o C and optimal filler content between 3 and 7 wt. % corresponding to pre-coagulation condition as revealed by hydrostatic densitometry. Temperature dependence of conductivity was in good accordance with VTF model. Considering very small thickness of cross-linked films, such membranes are promising for use in DMFC due to high expected specific power.

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“…Figure 3a closely resembles those discovered by other authors used different fillers (14,15). At low filler concentrations effect of filler content is positive.…”

Section: Effect Of Filler Contentsupporting

confidence: 87%

Polyvinyl Alcohol Based Nanocomposite Membranes Containing Aluminum Hydroxide Gel

2013

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“…The intensity ratio of the bands at 916 and 856 cm -1 increased with the increasing SiO 2 content, also indicating a decrease of the crystallinity. A new feature in the spectrum is the weak scattering band at 980 cm -1 corresponding to Si-OH vibrations [31,32]. A significant shoulder appears around 1337 cm -1 for PVA/SiO 2 /2T and then forms a second maximum for PVA/SiO 2 /4T.…”

Section: Resultsmentioning

confidence: 96%

Comparative study of PVA/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes prepared by single-step solution casting method

et al. 2015

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We prepared poly(vinyl alcohol) (PVA)/SiO 2 and PVA/SiO 2 /glutaraldehyde (GA) nanocomposite membranes in a single step using the solution casting method. The structure, morphology, and properties of these nanocomposite membranes were characterized by Raman spectroscopy, atomic force microscopy, small-and wideangle X-ray scattering, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis (DMA). The influence of silica and GA loading on the meso-scale characteristics of the composite membranes was investigated. The results showed that silica deposited in the form of small nanoparticles (*1 nm) in the PVA/ SiO 2 membranes, while bigger submicron particles ([25 nm) were formed in the PVA/SiO 2 /GA membranes. The water uptake of the PVA/SiO 2 membranes increased with temperature, but the PVA/SiO 2 /GA membranes were completely dissolved above 50°C. We can therefore conclude that the addition of GA deteriorated the properties of PVA/SiO 2 membranes. The thermal stability of the PVA/ SiO 2 membranes increased with the increasing silica loading with a maximum char yield of 46 % for PVA/SiO 2 / 4T. Even DMA profiles indicated a promising increase in E R (rubbery modulus) from 6 MPa (PVA membrane) to 1015 MPa (PVA/SiO 2 /4T) at 250°C, showing high mechanical strength of these membranes.

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“…The original concept was proposed by Watanabe et al [73], which formed the base for the development of self-humidifying composite membranes. Such hygroscopic oxides have also been incorporated into PVA [70,74].…”

Section: Inorganic Organic Composite Membranementioning

confidence: 98%

Where do poly(vinyl alcohol) based membranes stand in relation to Nafion® for direct methanol fuel cell applications?

Maiti

Kakati

Lee

et al. 2012

Journal of Power Sources

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Preparation of novel poly(vinyl alcohol)/SiO2 nanocomposite membranes by a sol–gel process and their application on alkaline DMFCs

Cited by 75 publications

References 23 publications

Polyvinyl Alcohol Based Nanocomposite Membranes Containing Aluminum Hydroxide Gel

Polyvinyl Alcohol Based Nanocomposite Membranes Containing Aluminum Hydroxide Gel

Comparative study of PVA/SiO2 and PVA/SiO2/glutaraldehyde (GA) nanocomposite membranes prepared by single-step solution casting method

Where do poly(vinyl alcohol) based membranes stand in relation to Nafion® for direct methanol fuel cell applications?

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