Properties and PEFC durability of aromatic /aliphatic polyimide electrolyte membranes

Kenji Miyatake*, Naoki Asano, Makoto Aoki, Hiroyuki Uchida, Masahiro Watanabe


研究成果: Paper査読


In order to produce a proton conductive and durable polymer electrolyte membrane for fuel cell applications, a series of sulfonated polyimide electrolytes (SPI-5) containing aliphatic groups both in the main and the side chains have been synthesized. SPI-5 with the ion exchange capacity of 1.78 - 2.33 meq/g were obtained by a typical polycondensation reaction as transparent, ductile and flexible membranes. The proton conductivity of SPI-5 was slightly lower than that of the perfluorinated ionomer (Nafion) membrane below 100°C, but comparable at higher temperature and humidity. By incorporating a small amount of trifunctional monomer, the proton conductivity and hydrolytic stability of SPI-5 were improved. It was found out that block copolymers showed much higher proton conductivity than the random copolymers. Well-developed hydrophilic and hydrophobic phase separation was confirmed for the block copolymer membranes, which should be responsible for high proton conductivity. Fuel cell was fabricated with SPI-5 membrane and operated at 80 °C and 0.2 A/cm2 supplying hydrogen and air both at 60% or 90% RH. SPI-5 membrane showed comparable performance to Nafion and durable for 5000 h without distinct degradation.

出版ステータスPublished - 2006
イベント55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
継続期間: 2006 9月 202006 9月 22


Other55th Society of Polymer Science Japan Symposium on Macromolecules

ASJC Scopus subject areas

  • 工学(全般)


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