無水フッ化水素で表面改質したLaNi_<5-x>Al_x(x=0, 0.3)の水素化・脱水素化特性に及ぼすCOの影響 Effect of CO on the Cyclic Hydriding-Dehydriding Characteristics of the LaNi_<5-x>Al_x(x=0, 0.3)Alloys Treated by Anhydrous Hydrogen Fluoride

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Hydrogen storage alloys exhibit reversible high-rate hydrogen absorption and desorption reactions. The hydrogen storage density of the alloys is higher than that liquid H<sub>2</sub>. The exposure of the alloys to impurity gases such as O<sub>2</sub>, CO, CO<sub>2</sub>, and H<sub>2</sub>O readily reduces reactivity with H<sub>2</sub> gas. In this study, the surface of LaNi<sub>5-x</sub>Al<sub>x</sub> alloy was treated using anhydrous hydrogen fluoride to examine the effect of CO on fluorinated alloy H<sub>2</sub> reactivity. This HF treatment effectively reduced alloy surface poisoning by CO. Compared with the initial transfer, the HF-treated alloy still exhibited 80% hydrogen transfer after 100-cycle hydriding-dehydriding reactions in a H<sub>2</sub> gas including 1000ppm CO, while the transfer became zero for untreated alloy after five hydriding-dehydriding cycles. AES analysis of HF-treated samples showed that the HF treatment induced the surface segregation of Ni and F atoms where almost no La atoms was detected. The concentration of La atoms was found to increase with depth, in which a mixed region of La, Ni, Al, F, and O atoms was formed. This fluorinated surface layer seems to function both to prevent surface CO poisoning and to act as a catalyst.

収録刊行物

  • 表面技術 = The Journal of the Surface Finishing Society of Japan  

    表面技術 = The Journal of the Surface Finishing Society of Japan 48(12), 1212-1217, 1997-12-01 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002260609
  • NII書誌ID(NCID)
    AN1005202X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09151869
  • NDL 記事登録ID
    4367244
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-291
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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