Pt-M合金(M=Ru, Sn)上におけるCO酸化に関する活性化エネルギーの評価 Activation Barriers of CO Oxidation on Pt-M(M=Ru, Sn) Alloys

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抄録

  Fuel cells have attracted attention in recent years because they are very energy-efficient. However, we have to face up to a serious problem in that platinum, which is the usual anode electrocatalyst, is readily poisoned by CO. In the case of the Direct Methanol Fuel Cell (DMFC), it is very important to develop new materials for use as electrocatalysts that exhibit good tolerance to CO, since CO is invariably present as an intermediate in the dissociation of methanol. The aim of this study is to examine the mechanism of H<sub>2</sub>O dissociation and of the CO+OH combination reactions in the CO oxidation process by calculating the adsorption energies and the activation barriers. In the case of Pt-Ru alloys, the activation barrier of the H<sub>2</sub>O dissociation reaction is almost the same as it is for pure Pt. The activation energy of the CO+OH combination reaction on Pt-Ru alloy is larger than that on pure Pt. Nevertheless, the adsorption energy of H<sub>2</sub>O is larger than that on pure Pt. On the other hand, the activation barrier and adsorption energies of H<sub>2</sub>O on Pt-Sn alloy are very close to the corresponding values on pure Pt. Moreover, the activation barrier for the CO+OH combination reaction on Pt-Sn alloy is lower than that on pure Pt.<br>

収録刊行物

  • 日本金屬學會誌 = Journal of the Japan Institute of Metals  

    日本金屬學會誌 = Journal of the Japan Institute of Metals 70(6), 495-499, 2006-06-20 

    日本金属学会

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各種コード

  • NII論文ID(NAID)
    10018161273
  • NII書誌ID(NCID)
    AN00062446
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214876
  • NDL 記事登録ID
    8011144
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-314
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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