Polymer electrolyte fuel cells based on main-chain-type sulfonated polyimides

Yamada, Otoo; Yin, Yan; Tanaka, Kazuhiro; Kita, Hidetoshi; Okamoto, Ken‐ichi

doi:10.1016/j.electacta.2004.11.009

Cited by 50 publications

(31 citation statements)

References 25 publications

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“…Moreover, the ratio of through-plane to in-plane conductivity for the composite membranes increases with increasing zeolite content. Although anisotropic proton conductivity has been reported in the literature and was shown to be dependent on the membrane casting method, membrane pretreatment procedure such as hot pressing, and membrane morphology [58][59][60][61][62][63][64][65], it is obvious that the porosity/voids of these Nafion-Faujasite composite membranes contribute for this difference. In fact, by hot pressing the membranes the two conductivity values become very similar.…”

Section: Sample Labelmentioning

confidence: 92%

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

Zhang

Désilets

Felice

et al. 2011

Journal of Power Sources

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a b s t r a c tAlthough zeolites are introduced to decrease methanol crossover of Nafion membranes for direct methanol fuel cells (DMFCs), little is known about the effect of their intrinsic properties and the interaction with the ionomer. In this work, Nafion-Faujasite composite membranes prepared by solution casting were characterized by extensive physicochemical and electrochemical techniques. Faujasite was found to undergo severe dealumination during the membrane activation, but its structure remained intact. The zeolite interacts with Nafion probably through hydrogen bonding between Si-OH and SO 3 H groups, which combined with the increase of the water uptake and the water mobility, and the addition of a less conductive phase (the zeolite) leads to an optimum proton conductivity between 0.98 and 2 wt% of zeolite. Hot pressing the membranes before their assembling with the electrodes enhanced the DMFC performance by reducing the methanol crossover and the serial resistance.

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Section: Sample Labelmentioning

confidence: 92%

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

Zhang

Désilets

Felice

et al. 2011

Journal of Power Sources

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“…Figure 17 shows effect of humidifier temperature on PEFC performance for NTDA-BAPBDS/BAPB (2/1) membrane. 59 When the temperature of H 2 /O 2 humidifiers decreased from 88/85 C (corresponding to 93/84% RH) to 80/80 C (70/70% RH), a slight decrease in cell voltage, for example, by about 20 mV at a current density of 1.0 A/cm 2 was observed. Judging from the large dependence of proton conductivity on RH, this rather small effect implies effective back diffusion of water formed at the cathode into the membrane bulk.…”

Section: Polymer Electrolyte Fuel Cellmentioning

confidence: 99%

“…Assuming a simple equivalent circuit, membrane resistance (R m ) and reaction resistance at electrodes (R el ) were evaluated from the impedance spectra. 59 The R m and R el values at 1.0 V are listed in Table VII. The lower R el values indicate the good contact of MEAs, which is essential for the high performance of fuel cells.…”

Section: Polymer Electrolyte Fuel Cellmentioning

confidence: 99%

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

Yin

Yamada

Tanaka

et al. 2006

Polym J

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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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“…Unfortunately, most of the current hydrocarbon-based PEM research has been limited to the polymer synthesis and membrane characterization, and much fewer MEA and cell performance studies of hydrocarbon-based polymers have been conducted [14][15][16][17]. In this work, we report the DMFC performance of a new homopolymer-like sulfonated phenylated PAEK that was made by a rapid and site-specific postsulfonation of a readily prepared PAEK having a rigid molecular chain structure.…”

Section: Introductionmentioning

confidence: 99%

Preparation and DMFC performance of a sulfophenylated poly(arylene ether ketone) polymer electrolyte membrane

Liu¹,

Hu²,

Kim³

et al. 2010

Electrochimica Acta

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Polymer electrolyte fuel cells based on main-chain-type sulfonated polyimides

Cited by 50 publications

References 25 publications

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

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

Preparation and DMFC performance of a sulfophenylated poly(arylene ether ketone) polymer electrolyte membrane

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