サイクリックボルタンメトリー法による固体高分子形燃料電池の発電状態カソード有効電極触媒面積の解析(熱工学,内燃機関,動力など) Cyclic Voltammetry Analysis of the Cathode Active Catalyst Area of a Power Generating Polymer Electrolyte Fuel Cell(Thermal Engineering)

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To maintain stable and high performance of a PEFC, sufficient three-phase boundary at the electrode catalyst of the cathode is necessary so that the catalyst works effectively. Measurement of the active electrode catalyst area of the cathode of an operating PEFC allows to detect the performance degradation. We have therefore investigated the area by cyclic voltammetry. Relation between peak current for the oxygen reduction reaction and square root of scan rate of an unconventionally fast scan and large current cyclic voltammogram is found to give the active area under power generation. We thereby observe decreases in the area due to catalyst degradation associated with operating duration of a cell and due to a decrease in humidity of fed air. This information under power generation cannot be obtained from the conventional method that measures the charge of underpotential deposition (UPD) of hydrogen at the catalyst. Taking into account diffusion of dissolved oxygen in liquid water layer adjacent to the catalyst layer, more reasonable area is estimated than that calculated with the conventional gas-phase oxygen diffusion model. The area estimated is one order of magnitude larger than that from the conventional UPD method.

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  • 日本機械学会論文集 B編

    日本機械学会論文集 B編 75(758), 2068-2075, 2009

    一般社団法人 日本機械学会

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各種コード

  • NII論文ID(NAID)
    110007387078
  • NII書誌ID(NCID)
    AN00187441
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0387-5016
  • NDL 記事登録ID
    10474565
  • NDL 雑誌分類
    ZN11(科学技術--機械工学・工業)
  • NDL 請求記号
    Z16-109
  • データ提供元
    CJP書誌  NDL  NII-ELS  J-STAGE 
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