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成果報告書詳細
管理番号20190000000142
タイトル*2018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2019/6/11
報告書年度2018 - 2018
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
部署名次世代電池・水素部
和文要約
英文要約Title: Superlative, Stable, and Scalable Fuel Cell Project (FY2015-FY2019) FY2018 Annual Report

1) New concept of cathode catalysts ・It was found that n-PtCo/CN2-HT (PtCo alloy prepared by the nanocapsule method, followed by heat-treatment in N 2) exhibited the highest specific activity (4.4 time higher than c-Pt/C) for the oxygen reduction reaction (ORR) as well as high durability. ・The performances of Pt/Nb-SnO2 cathode catalyst layers was improved by controlling the microstructure of the Nb-SnO2 support with fused-aggregate structure. ・By SEM (with ultra-low acceleration voltage) and XAS, we clarified a distribution and structure change of ionomers in the cathode catalyst layers. ・Compared with a case of Pt/GCB cathode, the degradation of Pt/Nb-SnO2 cathode during the load-change cycles was found to be mitigated. This is because Pt dissolution was suppressed by a decrease in the electronic conductivity of Nb-SnO2 support at high potentials. ・We have succeeded in preparing n-PtCo/C with high ORR activity and high acid-tolerance by the optimized heat treatment. Pt nanoparticles were successfully dispersed on Nb-SnO2 by TKK. 2) Development of new concept for ionomer materials・Sulfonated polyphenylene ionomer (SPP-BP) membranes prepared from simpler monomers (dichlorobiphenyls) exhibited high proton conductivity and chemical stability similar to SPP-QP membrane. ・SBAF membranes containing trifluoromethyl groups exhibited higher conductivity than that of SPP-QP membranes.・Mechanical properties, in particular, elongation at break of SPP-QP membranes were significantly improved by reinforcement with porous polyethylene substrate.・A versatile synthetic method of hydrocarbon ionomers using NiBr2 and Zn was successfully applied to SPP-QP and SBAF membranes.・Durability of cathode carbon support was improved by using SPP-QP as anode binder.・SPP-QP membrane exhibited durability in humidity cycle (30000 cycles) and accelerated OCV hold (1000 h) tests with some minor degradation.・Specific adsorbability of HC ionomers on Pt surfaces was quantitatively analyzed via neutron reflectivity and X-ray absorption fine structure measurements. 3) New concept of anode catalysts highly tolerant to impurities ・We found that the optimum composition range of PtxAL-Pt100-yCoy/C for CO-tolerant hydrogen oxidation reaction activity was from y = 30 to 50 atom%. A high CO-tolerance of PtCo/C was also confirmed in a single cell test with 100 ppm CO/H2 fuel. ・PtRu1.3 nanoparticles supported on Ketjen black with high surface area 1600 m2/g, which was successfully synthesized with a large scale, exhibited high CO-tolerant HOR activity in a single cell at 80℃, ・We found that CO-tolerant HOR activities of c-Pt/C and c-Pt2Ru3/C increased by an addition of graphene oxide (GO) probably due to a weakening of CO adsorption. Such an effect was also observed at GO/Pt polycrystalline electrode. ・By a first-principle calculation, the adsorption energies of CO, NH3, and H2S at Pt22 clusters supported on SnO2 were found to decrease further by alloying Pt with Co.
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