成果報告書詳細
管理番号20120000000398
タイトル*平成23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 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2012/6/27
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋:
1. 研究開発の内研究開発の内研究開発の内研究開発の内容及び成果等容及び成果等容及び成果等
1 劣化機構解析劣化機構解析劣化機構解析劣化機構解析
1) 電極触媒の負荷変動及び不純物による劣化速度・機構の解析〔山梨大学〕
英文要約Title: Strategic Development of PEFC Technologies for Practical Application/Research on Nanomaterials for High Performance Fuel Cells (FY2008-FY2012) FY2011 Annual Report
1) Analysis of degradation mechanisms for the PEFC cathode, membrane and MEA・ We have found that SiO2-coated 20 wt%-Pt/GC exhibited higher durability for start-stop potential step cycles (0.9 to 1.3 V, 30 s holding) than that on SiO2-coated 50 wt%-Pt/GC. This is ascribed to a mitigation of the aggregation of nanoparticles due to longer interparticle distance.・ We have succeeded in analyzing the degradation products of sulfonated block polyether electrolyte membranes after several operation tests of a single cell. We also found that a new sulfonated block polyketone electrolyte exhibited much higher durability.2) Development of high activity, high durability catalysts・ TKK and UY have succeeded in preparing a 10-g batch of Pt/GC by the nanocapsule method. We also examined ways to optimize the reaction steps for scaled-up production.・ We have developed a new cathode catalyst with a stable Pt skin layer (2 monolayers) formed on PtCo (2 nm)/C. This catalyst exhibited very high durability for start-stop potential step cycles.・ We have succeeded in analyzing changes in the hydrogen adsorption and oxide formation processes on Pt-Co (100), (111) and (110) single crystal electrodes to find clues for the design of new ORR alloy catalysts.・ We have succeeded in increasing the mass activities for the ORR on Pt/SnO2 and Pt/TiN catalysts, which have exhibited high durability for start-stop potential cycles.3)Development of polymer electrolyte membranes suitable for wide temperature range and low humidity.・ We developed novel aromatic block copolymers, which containing highly sulfonated hydrophilic blocks and polybenzimidazole or polyimide hydrophobic blocks.・ We visualized the topology and proton transport current on the surfaces of ionomer membranes to show the sulfonated poly(arylene ether) block copolymer membrane formed well developed proton transport pathways.・ We developed a novel series of sulfonated poly(arylene ether) block copolymers. The copolymer membranes showed proton conductivities comaparable to that of Nafion.・ We confirmed that sulfonated polyimide and polyether membranes are durable in the freeze/thaw cycling for tests at least several hundred cycles.4) Research on high performance, high-reliability MEAs for fuel cell vehicles・ Thin catalyst layers with improved effectiveness of Pt were prepared by adding carbon black.・ New and old FCCJ standard voltage step protocols were compared, and serious degradation was found by periodic CV and IV tests.・ The distributions of the Pt nanoparticles on the surface or in nanopores of the support materials were investigated.・ The Pt supported with ceramic support materials without nanopores showed high Pt utilization.・ New types of hydrocarbon membranes and ionomers were investigated in MEA tests.・ The cold-start behavior of MEAs using GDLs with hydrophilic layers was investigated.・ The Raman spectroscopic method was demonstrated to be applicable for the evaluation of carbon-supported Pt catalysts.
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