成果報告書詳細
管理番号20090000000623
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 次世代技術開発 リン酸二量体ハイブリッド電解質膜を使用した中温燃料電池の研究開発
公開日2010/3/13
報告書年度2008 - 2008
委託先名国立大学法人名古屋大学
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)プロトン導電体の高性能化 SnP2O7の固体酸性度を弱める目的で、このリン酸塩に二価のカチオンであるアルカリ土類金属イオン、Ca2+、Mg2+、Sr2+、Ba2+をドープした。これらの中でも、Sn4+イオンのイオン半径に最も近いMg2+イオンのドーピングによって導電率へのポジティブな効果が観察された。
英文要約Title:Strategic Development of PEFC Technologies for Practical Application.
Development of Intermediate-Temperature Fuel Cells Using Pyrophosphate-Based Hybrid Electrolyte Membranes (FY2006-FY2009) FY2008 Annual Report
In recent years, numerous studies have been devoted to the development of proton exchange membrane fuel cells (PEMFCs) capable of operating above 100°C, in order to avoid the problem of serious CO poisoning of the anode catalyst. It is also of great concern to operate PEMFCs under low-humidity conditions, because the space and energy required for external humidification are eliminated or minimized in the fuel cell system. We found that In3+- or Al3+-doped SnP2O7 (Sn0.9In0.1P2O7 or Sn0.95Al0.05P2O7) showed high proton conductivities above 0.1 S cm-1 in the temperature rage of 100-300oC in dry conditions. This material was also explored for using an electrolyte for high-temperature PEMFCs. However, some serious challenges still remain, including the strong solid acidity of the electrolyte material, low mechanical strength of the electrolyte membrane, and the high electrode resistance, especially at the cathode. In this research project, we will address the above challenges and demonstrate advantages of our fuel cell over conventional PEMFCs. Notable results of the 2008 fiscal year are summarized as below: (1) 10 mol% Mg2+-doped SnP2O7 (Sn0.9Mg0.1P2O7) improved stability of the Pt catalyst and carbon support in the fuel cell at high potentials, which was attributed to a large reduction in the acidity of SnP2O7 resulting from the basicity of MgO. (2) A composite membrane fabricated by blending the Sn0.95Al0.05P2O7 powders with sulfonated styrene-b-[ethylene-co-butylene]-b-styrene (sSEBS) block copolymers exhibited a conductivity of 5.6x10-3 S cm-1 at 150oC and a tensile strength of 2.8 MPa. (3) Al3+-doped SiC (Si0.97Al0.03C) and Sn1-xInxP2O7 functioned as catalytic promoter and ionomer, respectively, for the cathode by dispersing them over the carbon support. (4) A Mo2C-ZrO2/C had high potential as an anode catalyst for direct hydrocarbon fuel cells operating above 200oC.
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