放射線による高性能燃料電池膜の分子設計とその創製

Development of high-performance fuel cell membrane by radiation techniques

Chen, J.; 越川 博; 浅野 雅春; 前川 康成; 吉田 勝*; Li, D.; 奥 浩之*; Zhai, M.*

Chen, J.; Koshikawa, Hiroshi; Asano, Masaharu; Maekawa, Yasunari; Yoshida, Masaru*; Li, D.; Oku, Hiroyuki*; Zhai, M.*

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・放射線二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。

A highly thermal engineering aromatic polymer, polyetheretherketone (PEEK) film was used as the base film to develop the polymer electrolyte membrane by radiation-grafting method. However, because of the low grafting activity of the PEEK chains, the styrenesulfonic ethyl ester (ETSS) monomer was difficult to directly graft to the PEEK film with request amounts. In this study, we first grafted a divinylbenzene (DVB) monomer into the PEEK film to form the radiation-active sites, through which ETSS can be easily grafted to the PEEK during the second radiation grafting step. As a result, new polymer electrolyte membranes with high proton conductivity and low methanol permeability were successfully developed.