白金担持カーボン-ポリイオンコンプレックスで構成された電極触媒層の電気化学的キャラクタリゼーション  [in Japanese] Electrochemical characterization of Pt/C and a polyelectrolyte complex-based catalyst layer  [in Japanese]

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Author(s)

Abstract

固体高分子形燃料電池用電極触媒層は,白金担持カーボン(Pt/C)とプロトン伝導性高分子の混合使用により三相界面を形成している.プロトン伝導膜としてナフィオンを使用した場合,ナフィオンの疎水性クラスターに覆われた白金微粒子は,三相界面を形成せず反応に関与できないため,電極触媒中の白金利用率は十分に高くはない.そこで,ナフィオンに代わるプロトン伝導膜として,ポリイオンコンプレックス膜(PEC)を採用しPt/Cに混合させた.PECは疎水性クラスターサイズが小さく白金微粒子を隠蔽しにくいため,白金の利用率がナフィオンよりも高くなると考えられる.本研究では金基盤電極上にPt/CとPECを混合させた電極触媒層を作製し,3電極式電気化学測定により,Pt/Cとナフィオンを用いた場合に対する白金利用率の比較検討を行った.その結果,ナフィオンと同体積のPECを混合した電極では,ナフィオン混合時と比較して約1.5倍に白金表面積が増加することを見いだした.<br>

The electrocatalyst layer of polymer electrolyte fuel cells(PEFCs) formed a three-phase interface by using a mixture of Pt/C and a proton-conductive polymer. In the case where Nafion was used as a proton-conductive polymer, some extent of platinum particles of Pt/C were covered by a insulation property cluster of Nafion; therefor, an efficient formation of the three-phase interface was not achieved. In the present study, polyelectrolyte complex(PEC) was used with Pt/C instead of Nafion. PEC, which has a small cluster size, could be expected not to cover the Pt particle. An electrode catalyst layer consisting of the Pt/C and a PEC was prepared on an Au flag electrode. The platinum utilization efficiency was measured by cyclic voltammetry. As a result, it was found that the Pt surface area of the Pt/C-PEC was 1.5-times larger than that of Pt/C-Nafion.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 53(9), 981-986, 2004-09-05

    The Japan Society for Analytical Chemistry

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Codes

  • NII Article ID (NAID)
    110002905457
  • NII NACSIS-CAT ID (NCID)
    AN00222633
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    05251931
  • NDL Article ID
    7093958
  • NDL Source Classification
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL Call No.
    Z17-9
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE  NDL-Digital 
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