成果報告書詳細
管理番号20130000000587
タイトル*平成24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 基盤技術開発 劣化機構解析とナノテクノロジーを融合した高性能セルのための基礎的材料研究
公開日2015/12/19
報告書年度2012 - 2012
委託先名国立大学法人山梨大学 株式会社カネカ 株式会社東レリサーチセンター 富士電機株式会社 田中貴金属工業株式会社 株式会社島津製作所 パナソニック株式会社
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/Research on Nanomaterials for High Performance Fuel Cells (FY2008-FY2012) FY2012 Annual Report

1) Analysis of degradation mechanisms for the PEFC cathode, membrane and MEA・ We have found that 20 wt%-Pt/GCB coated with uniform SiO2 layer exhibited much higher durability (×5000 life time) for the potential step cycles (0.6 to 1.0 V, 3 s holding) than that of standard 50 wt% c-Pt/CB. ・ We have found that the oxygen reduction reaction (ORR) activity at Pt/CB electrode decreased almost linearly with logarithm of SO42- concentration, which is a decomposition product from polymer electrolytes.・ We have found that a removal of Cl- ion contamination from sulfonated block polyketone electrolyte mitigated both the degradation of the cell performance and the decomposition of the membrane. 2) Development of high activity, high durability catalysts・ TKK has succeeded in controlling Pt particle size for 20 g-scale 30 wt% Pt/GCB prepared by the nanocapsule method. Fuji Electric Co. has demonstrated that this catalyst exhibited very high performance in the MEA.・ We have developed a new cathode catalyst with a stable Pt skin layer (2 monolayers) formed on PtCo (2 nm)/GCB. The mass activity of this catalyst for the ORR was 2.2 times higher than the c-Pt/CB at 80 - 90oC.・ We, for the first time, demonstrated that the values of the core-level shift increased in proportion to the inverse of the particle size of Pt highly dispersed on glassy carbon electrode, presumably due to an increase in Coulomb’s attractive force between a positive hole and an electron for the photoelectron emission. 3) Development of polymer electrolyte membranes suitable for wide temperature range and low humidity. We confirmed that the lower electron density and higher acidity in the hydrophilic block contributed to improving proton conductivity and stability of sulfonated poly(arylene ether) block copolymer membranes.・ We found that reinforcement significantly improved mechanical properties of sulfonated poly(arylene ether) block copolymer membranes under wet/dry cycling conditions.・ We confirmed that the average diameter of the proton conductive spots in the sulfonated poly(arylene ether) block copolymer membranes.・ We have synthesized brominated and sulfonated poly(arylene ether) block copolymer membranes for improved oxidative stability. 4) Research on high performance, high-reliability MEAs for fuel cell vehicles・ Thin catalyst layers with improved effectiveness of Pt were prepared by use of the nanocapsule method and optimization of the ionomer.・ New and old FCCJ standard protocols were compared, and the degradation affected by the lower potential limits.・ The cycling replacement process of the anode gas was performed among air, hydrogen, and nitrogen. The various catalysts on the durability process were investigated.・ Pt/SnO2 as cathode catalyst under the dry condition showed comparable initial performance to that using Pt/CB.・ MEAs using new hydrocarbon membranes showed comparable initial performance to that using NR212, and could be also started from sub-zero condition.
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