二段階グラフト重合法による高性能電解質膜の作製とその電池性能

Modification of polyetheretherketone film for application in fuel cells

Chen, J.; 浅野 雅春; 前川 康成

Chen, J.; Asano, Masaharu; Maekawa, Yasunari

高分子型燃料電池に適用可能な高性能電解質膜の開発を目的として、耐熱性や機械特性に優れる芳香族高分子ポリエーテルエーテルケトン(PEEK)膜を用いて、熱グラフト重合と放射線グラフト重合を組合せた熱・放射線2段グラフト重合技術により、高い導電性と耐久性を併せ持つ電解質膜を合成した。開発した電解質膜を組み込んだ単セルにおける発電試験の結果、従来高分子電解質膜に比べて優れた電池性能を有することが確認できた。

Polyetheretherketone (PEEK) films were modified by thermal grafting of divinylbenzene (DVB) followed by radiation grafting of ethyl styrenesulfonate (ETSS), to develop a polymer electrolyte membrane for use in polymer electrolyte membrane fuel cells or direct methanol fuel cells. The DVB-grafting considerably enhanced the subsequent ETSS-grafting. The ETSS units were converted to styrenesulfonic acid units by hydrolysis in water, resulting in a PEEK/DVB polymer electrolyte membrane. This new membrane was tested in a fuel cell, and a high cell performance was confirmed. Therefore, we conclude that this modified PEEK film can be used as the PEM for the application in fuel cells.