成果報告書詳細
管理番号20140000000176
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 スルホン酸基密度の最適設計と複合化による機能分担設計により、PEFCの高性能化と高信頼性化とを両立する新規炭化水素系電解質膜の研究開発
公開日2015/11/25
報告書年度2013 - 2013
委託先名東洋紡株式会社
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: Strategic Development of PEFC Technologies for Practical Application / Next Generation Technological Development / Research and Development of New Hydrocarbon Polymer Electrolyte Membrane Compatible with the High Reliability and High Performance of PEFC by Function Sharing Design Composed by the Optimization of Density of Sulfonic Acid Group and the Composite with Reinforcement (FY2013‐FY2014) FY2013 Annual Report

1. Introduction
On the business stage of Fuel Cell Vehicle (FCV) after FY2020, PEFC will be desired higher reliability and lower cost. To realize much higher proton conductivity, higher durability, higher reliability, and lower system cost, we have started research and development of new polymer electrolyte membrane (PEM) based on our novel technical concept.
2. Concept
Fundamental construction of new PEM is function sharing between polymer electrolyte and reinforcement. Mechanical durability and reliability of PEM is mainly contributed by the reinforcement. To achieve higher performance of PEFC, research and development of the polymer electrolyte is focused to proton conductivity, water transportability, and chemical stability.
3. Design and Development of new Polymer Electrolyte
The chemical structure of polymer electrolyte is designed from two aspects. One aspect is improvement of proton conductivity especially under low humidity. Efficient proton transfer can be occurred on an ionic cluster between sulfonic acid and water. To form the cluster, density of sulfonic acid group on polymer electrolyte must be high. Another aspect is improvement of chemical stability. Chemically weak structures (ex. ether bond) have to be eliminated. Based on these aspects, new polymer electrolyte is designed and laboratory scale synthesis scheme is established.
4. Reinforcement and Composite PEM
Reinforcement materials have to endure PEFC inner environment (ex. acidity, radical attack, and hydrolysis) and be suitable cost as industrial products. Also, morphology of the material is related to mechanical durability. Through examining various porous materials, promising materials is obtained. Fundamental technology of laboratory scale composite membrane production is authorized.
5. Properties
Proton conductivity of composite PEM is depends on IEC. Membranes with above 2 meq/g IEC exhibit good conductivity equal to Nafion‐ HP. Under low humidity, membrane resistance is nearly equal to the FY2013 target.
Mechanical durability is examined by dry/wet cycle test. Composite membranes do not break after 6,000 cycles and achieve FY2013 target.
Chemical durability is examined by immersing Fenton reagent. After immersing, weight loss of composite membranes is only several percent. OCV-dry/wet multi mode durability test (NEDO protocol) is started.
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