成果報告書詳細
管理番号20140000000141
タイトル*平成25年度中間年報 固体高分子形燃料電池実用化推進技術開発 次世代技術開発 低加湿下作動型新規ナノファイバー含有電解質超薄膜の研究開発
公開日2014/5/2
報告書年度2013 - 2013
委託先名公立大学法人首都大学東京 日本バイリーン株式会社
プロジェクト番号P10001
部署名新エネルギー部
和文要約
英文要約Title : Development of Ultra-thin Polymer Electrolyte Membranes Containing Novel Nanofibers for Low Humidity Fuel Cell Operation (FY2013-Fy2014) FY2013 Annual Report

Doping of phytic acid on the polybenzimidazole (PBI) nanofibers was verified by their weight change, ion exchange capacity (IEC) measurement, and solid state NMR spectroscopy before and after the acid doping. It was revealed that certain amount of phytic acid doped on the PBI nanofibers remained after the acid elution tests in hot water. Several polymers including conventional sulfonated polyimide (SPI), high performance sulfonated block-graft polyimide (S-bg-PI), and Nafion, were investigated as matrix polymers for the nanofiber composite membranes. All the composite membranes showed better gas barrier properties than the corresponding membranes without nanofibers. The oxygen permeance of S-bg-PI composite membrane was extremely low (1.1×10-9 cm3(STP)/(cm2 sec kPa), 35oC, 0%RH) close to the target value (<(1-9)×10-9 cm3(STP)/(cm2 sec kPa), 80oC, 95%RH)) set by FCCJ. Proton conductivities of the composite membranes using S-bg-PI and Nafion were slightly lower than the corresponding membranes without nanofibers; therefore, further optimization on preparation of composite membranes is required to improve the proton conductive characteristics. However, it is expected that relatively high through-plane proton conductivity on some composite membranes will achieve better fuel cell performances. In addition, we have succeeded to make continuous polybenzimidazole (PBI) nanofiber nonwovens. We have prepared thin polymer electrolyte membranes which composed of polymer electrolyte resins and phytic acid doped PBI nanofiber nonwovens. The composite membranes showed higher mechanical strength and dimensional stability compared to the membrane without PBI nanofiber nonwovens. The performance of the fuel cell prepared by the composite membrane using Nafion was improved at low humidity.
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