Methanol permeability and proton conductivity of sulfonated co-polyimide membranes

Okamoto, Ken‐ichi; Yin, Yan; Yamada, Otoo; Islam, Md. Nurul; Honda, Tatsuaki; Mishima, Takashi; Suto, Yoshiki; Tanaka, Kazuhiro; Kita, Hidetoshi

doi:10.1016/j.memsci.2005.02.031

Cited by 99 publications

(36 citation statements)

References 31 publications

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“…The water activation energy values are the same order of magnitude as those reported by Table 1 Activation energy, E, as a function of the initial methanol concentration difference (wt.% MeOH) associated with methanol and water fluxes through a Nafion membrane. other authors [21,22]. At a given methanol concentration difference, the activation energy of methanol flux is lower than that of water flux.…”

Section: Influence Of the Temperature Estimation Of Methanol And Watmentioning

confidence: 91%

Study of the activation energy for transport of water and methanol through a Nafion membrane

Godino

Barragán

Izquierdo

et al. 2009

Chemical Engineering Journal

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Section: Influence Of the Temperature Estimation Of Methanol And Watmentioning

confidence: 91%

Study of the activation energy for transport of water and methanol through a Nafion membrane

Godino

Barragán

Izquierdo

et al. 2009

Chemical Engineering Journal

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“…However, it is noted that some co-SPI membranes showed high proton conductivities comparable to Nafion 112 and simultaneously 3-4 times lower methanol permeabilities than Nafion and as a result, fairly high 0 values of 13-18 and 10{13 Â 10 4 S cm À3 s at 30 and 50 C, respectively. 58 This indicates that the co-SPI membranes have high potential for DMFC application.…”

Section: Methanol Permeation Behaviormentioning

confidence: 94%

On the Development of Naphthalene-Based Sulfonated Polyimide Membranes for Fuel Cell Applications

Yin

Yamada

Tanaka

et al. 2006

Polym J

176

109

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ABSTRACT:This article reviews the recent progress made over the past years based on naphthalene-based sulfonated polyimides (SPIs) in terms of proton conductivity, membrane swelling behavior, membrane stability toward water, and fuel cell performance in polymer electrolyte fuel cells (PEFCs) or direct methanol fuel cells (DMFCs). The structure-property relationship of SPI membranes is discussed in details with respect to the chemical structure of various sulfonated diamines and morphology of SPI membranes from the viewpoints of viscosity, mechanical strength and proton conductivity. Ion exchange capacity (IEC), basicity of sulfonated diamine, configuration (para-, meta-, or ortho-orientation) and chemical structure of polymer chain (linear or net-work) show great influence on the water stability and mechanical strength of SPI membrane. The SPIs with a branched/crosslinked structure and derived from highly basic sulfonated diamines display reasonably high water stability of more than 200-300 h in water at 130 C, suggesting high potential as PEMs operating at temperatures up to 100 C. The SPI membranes have fairly high proton conductivity at higher relative humidities and low methanol permeability. The water and methanol crossover through membrane under the fuel cell operation conditions is not controlled by electro-osmosis due to proton transport but by diffusion due to activity difference. This is quite different from the case of perfluorosulfonated membranes such as Nafion and results in the advantageous effects on fuel cell performance. SPI membranes displayed high PEFC performances comparable to those of Nafion 112. In addition, SPI membranes displayed higher performances in DMFC systems with higher methanol concentration (20-50 wt %), which is superior to Nafion and have high potential for DMFC applications at mediate temperatures (40-80 C In the past decades, great interest has been focused on the development of polymer electrolyte fuel cells (PEFCs) and direct methanol fuel cells (DMFCs) as a clean power source of energy for transportation, stationary and portable power applications.1,2 Fuel cells with high performance, high durability and potentially lower cost are greatly required. Polymer electrolyte membrane (PEM) is one of the key components in PEFC and DMFC systems. Perfluorosulfonic acid copolymer membranes, such as DuPont's Nafion membrane, are the state-of-the-art PEMs commercially available due to their high proton conductivity and excellent chemical stability.3,4 However, because of their high cost, low operational temperature below 80 C and large methanol crossover, there has been much interest in alternative PEMs. Many efforts have been done in the development of PEMs based on sulfonated aromatic hydrocarbon polymers. [5][6][7][8][9] The main problem existed in the hydrocarbon PEMs is the membrane stability under fuel cell conditions and low conducting performance at low moisture atmosphere. The balance between ion exchange capacity (IEC), proton conductivity and mechanical stability of a PEM ...

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“…[1][2][3][4][5] Sulfonated polyimide copolymers have been proposed by several research groups. [6][7][8][9][10][11][12][13][14][15][16][17] The advantage of polyimide ionomers is that a high-molecular-weight polymer with good film-forming capability and high mechanical strength can be easily synthesized by the polycondensation of sulfonated diamine monomers. The hydrophilic/hydrophobic balance or ion-exchange capacity (IEC) can be controlled by changes in the copolymer composition.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 However, hydrolytic stability is an issue to be addressed. Okamoto and coworkers [12][13][14] reported that introducing propoxy groups between the main chain and sulfonic acid groups improves the hydrolytic stability. We have also investigated the effect of aliphatic groups in both the main and side chains to achieve excellent hydrolytic and oxidative stability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of a polyimide containing pendant sulfophenoxypropoxy groups

Miyatake

Yasuda

Hirai

et al. 2006

J. Polym. Sci. A Polym. Chem.

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A novel sulfonated polyimide having pendant sulfophenoxypropoxy groups was synthesized, and its electrolyte properties were investigated for fuel‐cell applications. A diamine monomer was synthesized from 3,3′‐dihydroxybenzidine in four steps, and its polymerization was performed with 1,4,5,8‐naphthalenetetracarboxylic dianhydride in the presence of triethylamine and benzoic acid in m‐cresol. A flexible, ductile, and self‐standing membrane was obtained via casting from an m‐cresol solution. Good thermal, hydrolytic, and oxidative stability was confirmed. The ionomer membrane showed very high proton conductivity of 1.0 S cm−1 at 120 °C and 100% relative humidity, which is higher than that of a Nafion membrane.

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Methanol permeability and proton conductivity of sulfonated co-polyimide membranes

Cited by 99 publications

References 31 publications

Study of the activation energy for transport of water and methanol through a Nafion membrane

Study of the activation energy for transport of water and methanol through a Nafion membrane

On the Development of Naphthalene-Based Sulfonated Polyimide Membranes for Fuel Cell Applications

Synthesis and properties of a polyimide containing pendant sulfophenoxypropoxy groups

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