Tuned polymer electrolyte membranes based on aromatic polyethers for fuel cell applications

被引：0
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作者：
Miyatake, Kenji [1 ]
Chikashige, Yohei [1 ]
Higuchi, Eiji [1 ]
Watanabe, Masahiro [1 ]
机构：
[1] Clean Energy Research Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan
来源：
Journal of the American Chemical Society | 2007年 / 129卷 / 13期
关键词：
Poly(arylene ether sulfone)-based ionomers containing sulfofluorenyl groups have been synthesized for applications to polymer electrolyte membrane fuel cells (PEMFCs). In order to achieve high proton conductivity and chemical; mechanical; and dimensional stability; the molecular structure of the ionomers has been optimized. Tough; flexible; and transparent membranes were obtained from a series of modified ionomers containing methyl groups with the ion-exchange capacity (IEC) ranging from 1.32 to 3.26 meq/g. Isopropylidene tetramethylbiphenylene moieties were more effective than the methyl-substituted fluorenyl groups in giving a high-IEC ionomer membrane with substantial stability to hydrolysis and oxidation. Dimensional stability was significantly improved for the methyl-substituted ionomer membranes compared to that of the non-methylated ones. This new ionomer membrane showed comparable proton conductivity to that of the perfluorinated ionomer membrane (Nation 112) under a wide range of conditions (80-120°C and 20-93% relative humidity (RH)). The highest proton conductivity of 0.3 S/cm was obtained at 80°C and 93% RH. Although there is a decline of proton conductivity with time; after 10 000 h the proton conductivities were still at acceptable levels for fuel cell operation. The membranes retained their strength; flexibility; and high molecular weight after 10 000 h. Microscopic analyses revealed well-connected ionic clusters for the high-IEC membrane. A fuel cell operated using the polyether ionomer membrane showed better performance than that of Nation at a low humidity of 20% RH and high temperature of 90°C. Unlike the other hydrocarbon ionomers; the present membrane showed a lower resistance than expected from its conductivity; indicating superior water-holding capability at high temperature and low humidity. © 2007 American Chemical Society;
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页码：3879 / 3887
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