成果報告書詳細
管理番号20090000000020
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 要素技術開発 高濃度CO耐性アノード触媒
公開日2010/2/19
報告書年度2008 - 2008
委託先名国立大学法人山梨大学 国立大学法人筑波大学 国立大学法人北海道大学 独立行政法人産業技術総合研究所 アイシン精機株式会社 株式会社ENEOSセルテック 東芝燃料電池システム株式会社 パナソニック株式会社 富士電機アドバンストテクノロジー株式会社
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 1.1 本プロジェクトの目的 定置用固体高分子形燃料電池システムの広汎な普及のためにはいっそうのコストダウンが必要である。燃料改質系の簡素化は極めて有効な手段である。本プロジェクトは、CO選択酸化触媒(PROX)を省略した場合に想定されるCO濃度500 ppm(過渡時には2000 ppm程度)の改質ガスで運転可能な電池開発に資するものである。これまで試みられなかった(1)高CO耐性・高活性触媒の開発、(2)CO耐性・活性向上機構の解析と触媒設計指針の確立、(3)高CO耐性の膜電極接合体MEAおよびその運転方法の開発を行う。これにより、CO濃度500 ppmを含有する改質ガスにおいても、定置用燃料電池で想定される電流密度0.2 A/cm2での電池電圧低下が20 mV以下に抑えられる性能が見通せるような電極触媒ならびにMEAのシ-ズ技術を確立する。
英文要約1) University of Yamanashi We have succeeded to prepare monodispersed Pt2Ru3 alloy catalysts supported on carbon black with uniform composition by the nanocapsule method. It was found by multi-channel flow cell technique that these new catalysts exhibited the hydrogen oxidation reaction (HOR) activities comparable to that of a commercial Pt2Ru3/C in 0.1 M HClO4 saturated with pure H2 at 60 oC. However, in the presence of 500 ppm CO at 60 oC, the commercial Pt2Ru3/C almost lost the activity after ca. 40 min, whereas these new catalysts maintained moderate HOR activities. To clarify the effect of Pt particle size on the CO adsorption or oxidation, the adsorbed CO and water were analyzed by ATR-FTIR spectroscopy. The interaction between COad and H2Oad was found to be weaker with decreasing Pt particle size.
2) University of Tsukuba) To evaluate the support effect, identical PtRu catalyst particles with the same alloy composition were dispersed on various types of carbon nanotubes (CNTs). We have observed significant differences in CO-tolerance; PtRu/CNTs exhibited very high performances compared with a commercial catalyst. In the surface science studies, Pt particles with mono-atomic height attached on graphite basal plane showed quite unique chemical properties, i.e., high catalytic activity for H2-D2 exchange reaction and very low adsorption energy of CO. Based on the scanning tunneling spectroscopy measurements of Pt particles on graphite, the modification of electronic state of Pt is ascribed to the hybridization between π-orbital of graphite and d-orbital of Pt. This is possibly related to the support effect of CNT observed in the electrochemical measurements.
3) Hokkaido University We have prepared several PtRu/C anode catalysts by various methods, and investigated their structures and CO tolerance. One of these in-house PtRu/C catalysts showed CO tolerance higher than that of a commercial PtRu/C catalyst. In addition, we have succeeded to prepare SnO2/PtRu/C catalyst with CO tolerance higher than those of commercial and in-house PtRu/C catalysts.
4) AIST In our previous NEDO project, we found a rhodium porphyrin catalyst that can oxidize CO at relatively low overpotential. New CO oxidation anode catalysts have been developed in this project. By changing porphyrin ligands, we have succeeded to develop a new rhodium porphyrin catalyst that can oxidize CO at less positive potential than 0.05 V vs. reversible hydrogen electrode. The optimization of the combination of these catalysts and Pt-based catalysts is underway.
5) AISIN SEIKI Uniform-Power-Generation-type MEAs were prepared with a commercial standard Pt2Ru3/C anode catalyst. Small-size cells were designed based on inlet potion and outlet portion of full-size cell, respectively. Basic performances of these cells as well as air bleed effects were evaluated.
6) ENEOS CELLTECH The performances of single cell with a commercial standard anode catalyst have been measured using a fuel including high concentration CO up to 2000 ppm.
7) Toshiba Fuel Cell Power Systems The voltage drop ΔV under 500 ppm CO in anode feed gas has been evaluated in our internally-humidified cells. Effects of the cell temperature and injection of lower levels of air into the anode gas were examined.
8) Panasonic We have evaluated the dependence of cell performance on Uf (fuel utilization) under various operating conditions using specially designed cell for high Uf.
9) Fuji Electric Advanced Technology We have evaluated the effects of air bleed on the cell voltage operated with the fuel gas containing CO.
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