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成果報告書詳細
管理番号20170000000143
タイトル*平成28年度中間年報 固体高分子形燃料電池利用高度化技術開発事業 普及拡大化基盤技術開発 セルスタックに関わる材料コンセプト創出(高出力・高耐久・高効率燃料電池材料のコンセプト創出)
公開日2017/6/2
報告書年度2016 - 2016
委託先名国立大学法人山梨大学 国立大学法人岩手大学 国立大学法人信州大学 国立大学法人東北大学 田中貴金属工業株式会社 株式会社カネカ パナソニック株式会社 株式会社日産アーク
プロジェクト番号P15001
部署名新エネルギー部
和文要約
英文要約Title: Superlative, Stable, and Scalable Fuel Cell Project (FY2015-FY2017) FY2016 Annual Report

1) New concept of cathode catalysts. By an electron diffraction, the crystal structure of Pt-Co alloy catalyst with a stable Pt skin layer supported on carbon Pt2ALPtCo/C was identified to be L10-type face-centered tetragonal (fct) core and fcc Pt-skin layer. We have examined the oxygen reduction reaction (ORR) activities jk of Pt100xCox single-crystal rotating disk electrodes, and found that the overall order of activity was (100) < (110) << (111), so that the enhancement factor for jk on the (111) face was significantly larger than the others, specifically at around Co 27 at%. e found that Pt100xCox highly dispersed on Ta-SnO2 support with fused-aggregate structure exhibited the maximum ORR activity at x = 25 at.%.We have successfully prepared the cathode catalyst layers (CLs) with low Pt-loading (0.05 mg/cm2) by electrospraying Pt/Ta-SnO2. The electrochemically active area and mass activity at 0.85 V of the CLs were improved by a large porosity and improved ionomer coverage. 2) Development of new concept for ionomer materials. High IEC hydrocarbon ionomer membranes composed of quinquephenylene as hydrophobic component and sulfonated phenylene as hydrophilic component have been prepared. The membranes did not degrade at all under harsh oxidative stability conditions.Terpolymers having perfluoroalkyl groups in the main chains have been designed and synthesized to further improve the membrane properties.The synthetic procedure of the aromatic hydrocarbon ionomers has been investigated to find a possibility of using inexpensive Ni(II) catalysts for the polymerization.The novel hydrocarbon ionomer membranes survived for 1000 h in an accelerated durability test (pressurized OCV hold test). Post-test analyses of the membranes proved the effectiveness of our molecular design and strategy. 3) New concept of anode catalysts highly tolerant to impurities.We found that the Pt2ALPtFe/C exhibited superlative mass activity for the CO-tolerant hydrogen oxidation reaction (HOR) at 70 to 90°C, together with high robustness with respect to air exposure. The CO-tolerant mechanism was successfully analyzed by in situ FTIR. A significant decrease in the adsorption energy of CO, NH3, and H2S at Pt2ALPtFe was demonstrated by a first-principle calculation.PtRu1.3 nanoparticles supported on Ketjen black with high surface area 1600 m2/g exhibited high CO-tolerant HOR activity. It was found by EXAFS that the PtRu1.3/KB1600 was well-alloyed, compared with a commercial catalyst supported on KB800.We analyzed catalytic promoting effects of oxides (WO3, SnOx, RuO2) on the CO-tolerance. The CO-tolerant HOR activity on Ru nanosheet with x-monolayers of Pt reached the maximum at x = 1.5. Such a new catalyst exhibited high durability against potential step cycling in CO-containing solution.
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