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Imidazolium cation based anion-conducting electrolyte membranes prepared by radiation induced grafting for direct hydrazine hydrate fuel cells

水加ヒドラジン燃料電池に用いるイミダゾリウムカチオンを有する放射線グラフト型アニオン伝導電解質膜

吉村 公男; 越川 博; 八巻 徹也; 猪谷 秀幸*; 山本 和矢*; 山口 進*; 田中 裕久*; 前川 康成

Yoshimura, Kimio; Koshikawa, Hiroshi; Yamaki, Tetsuya; Shishitani, Hideyuki*; Yamamoto, Kazuya*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari

イミダゾリウムカチオンを有するグラフト型アニオン伝導電解質膜を、テトラフルオロエチレン・エチレン共重合体(ETFE)膜に${it N}$-ビニルイミダゾールとスチレンを放射線グラフト重合により共重合する過程と、それに続く${it N}$-プロピル化およびイオン交換反応により作製した。得られたアニオン膜は、イオン交換容量は1.20mmol/g、導電率は28mS/cmであった。80$$^{circ}$$Cの1M KOH中での耐アルカリ性を評価した結果、浸漬250時間後でも10mS/cm以上の導電率が維持され、高い耐アルカリ性を有することがわかった。本研究のアニオン膜を用いて作製した水加ヒドラジン燃料電池において最高出力75mW/cm$$^{2}$$を確認した。

Graft-type anion-conducting electrolyte membranes (AEMs) with imidazolium cations on graft polymers were synthesized through radiation-induced graft polymerization of ${it N}$-vinylimidazole (NVIm) on poly(ethylene-co-tetrafluoroethylene) (ETFE) films, followed by ${it N}$-propylation and ion-exchange reactions. The ${it N}$-propylation proceeded quantitatively, whereas the ion-exchange reactions in 1 M KOH at 60$$^{circ}$$C were accompanied by partial $$beta$$-elimination of the imidazolium cations(AEM2), which exhibited an ion-exchange capacity (IEC) of 0.85 mmol g$$^{-1}$$ and ionic conductivity of 10 mS cm$$^{-1}$$. AEM2 showed alkaline stability at 60$$^{circ}$$C but it gradually degraded at 80$$^{circ}$$C for ca. 150 h. The copolymer-type AEM (AEM3) with an IEC of 1.20 mmol g$$^{-1}$$ was prepared through the copolymerization of NVIm with styrene on ETFE films, followed by the same ${it N}$-propylation and ion-exchange reactions. AEM3 was shown higher alkaline durability in 1 M KOH at 80$$^{circ}$$C. As a result, it exhibited higher conductivity ($$>$$10 mS cm$$^{-1}$$) for 250 h. Therefore, alkylimidazolium cations in copolymer grafts are a promising anion conducting group for alkaline-durable AEMs. A maximum power density of 75 mW cm$$^{-2}$$ is obtained for AEM3 in a direct hydrazine hydrate fuel cell.

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パーセンタイル:30.39

分野:Electrochemistry

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