成果報告書詳細
管理番号20090000000744
タイトル*平成20年度中間年報 固体高分子形燃料電池実用化戦略的技術開発 要素技術開発 高性能炭化水素系電解質膜の研究開発
公開日2009/12/29
報告書年度2008 - 2008
委託先名東レ株式会社
プロジェクト番号P05011
部署名燃料電池・水素技術開発部 燃料電池グループ
和文要約以下本編抜粋:1.研究開発の内容及び成果等(1)本事業の目的と概要 本事業は、燃料電池用電解質膜として将来的に低コスト及び低環境負荷が期待される炭化水素(HC)系電解質膜およびそれを用いた膜電極複合体(MEA)の高耐久化と高効率化を図ることを目的とする。 昨年度までに、ポリマ高次構造規則性に着目した革新的な炭化水素系電解質膜(TS膜)の開発に成功し、耐久性や低加湿下での高性能化を進めるとともに、耐久性評価後のMEA解析、連続発電評価も含めた検討を行ってきた。
英文要約Title: Strategic Development of PEFC Technologies for Practical Application Development of Elemental Technology The Development of High Performance Hydrocarbon Type Polymer Electrolyte Membrane (FY2005-FY2007) FY2008 Annual Report
We are developing new hydrocarbon type polymer electrolyte membrane, which has fundamentally cost effective and environmental advantage in future against fluorine type membrane, and long durability and high efficiency MEA using our new membrane. This year, we promoted the development aiming at overcoming the trade-off between the power and the durability of MEA using our membrane under the low humidification condition. That trade-off was a big problem of the hydrocarbon type polymer electrolyte membrane. We focus on the water behavior of polymer electrolyte and advance our examination in assuming that the controlling nano-scale morphology of the membrane makes water diffusion into the membrane from cathode and generate the power under low humidity condition. /// 1) High IEC and thinner membrane: Based on our assumption, we increased IEC (ionic exchange capacity) of polymer electrolyte and make a thinner membrane for easy water diffusion. Those polymers have a high power under low humidity, but very low performance of wet dry cyclic durability test. We found that we have to solve the trade-off problem between a low humidity power and a wet dry cyclic durability. /// 2) Analysis of water behavior in polymer electrolyte membrane: We characterized the water in our membrane under various humidity conditions. The peak shift of 1H-NMR showed the membrane under low humidity have the water influenced by sulphonic group and hard to move. And high IEC membrane at low humidity have the water which is not influenced by sulphonic group and easy to move freely, because of the peak broadening. From the above results and another analysis of water permeability and freezing point, we considered that a high mobility of water adjacent to the sulphonic group make a high power generation under low humidified condition. /// 3) Examination of the achieving a good balance between a low humidified power generation and a wet dry cyclic durability: We design the new hybrid polymer electrolyte membrane composed of two functions. One is the higher order structure to endure swelling and shrinking of the membrane for an enhancement of the wet dry cyclic durability. The other is the easy mobility of water around a sulphonic group to increase the proton conductivity under low humidified condition. We set two targets which are ten times of wet dry cyclic durability and the same level of low humidity power as the membrane of last year. On above targets, we tried three methods of examinations. Method A and B are the improvement of membrane forming or polymer composition. These data showed our design of hybrid polymer makes a difference. We go ahead with our design and found out that the method C is the best way to make a balance between low humidity power and wet dry cyclic durability. The performances of method C membrane are that low humidity power is equal and wet dry cyclic durability is nearly ten times to last year membrane.
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