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    請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/21900


    題名: 非貴重金屬觸媒於直接甲醇燃料電池之研究
    作者: 許新城;張孫堂;林麗瓊;陳貴賢;施漢章
    貢獻者: 工學院
    關鍵詞: 卟吩鈷
    氧還原反應
    非貴重金屬觸媒
    甲醇抗藥性
    CoTMPP
    ORR
    non-noble metal catalyst
    methanol-tolerance
    日期: 2009-01-01
    上傳時間: 2012-03-28 13:39:10 (UTC+8)
    摘要: 於直接甲醇燃料電池陰極端觸媒之研究中,皆以傳統白金作為觸媒,其成本十分高昂,當甲醇溶液由陽極滲透至陰極時,亦會造成所謂的甲醇滲透現象,導致混合電位的發生,嚴重地影響實際電池運轉之效能。因此,尋找較廉價,且不受甲醇滲透影響之觸媒,以替代白金等貴重金屬,已成為一重要議題。本研究使用5,10,15,20-四(4-甲氧苯基)卟吩鈷(CoTMPP)與商用碳粉(XC-72)混合成(CoTMPP/C),製成所需的直接甲醇燃料電池陰極端抗甲醇觸媒。吾人從電化學方式了解此材料作為陰極觸媒的最佳條件為20wt.% CoTMPP/C,熱處理溫度至700℃負載量是163μg/平方公尺,計算得知其電子傳遞數約3.1,與完美氧還原電子傳遞數比較,已與傳統白金相去不遠,顯示CoTMPP係大有可為。TG-DTA證實熱處理溫度對觸媒結構具有極大之影響,於500℃~800℃之間尤甚。再利用XPS於結構上作分析,CoTMPP在經過燒結以後,所形成的型態為Co-N(下標 x)-C(下標 y)以及金屬鈷兩種,証實對CoTMPP催化特性有加成的效果,能夠有效與氧氣反應,提升氧還原能力,增進氧還原的效能。

    The methanol crossover, which methanol diffuses from anode to cathode, is the major hurdles that prevent direct methanol fuel cell (DMFC) from becoming a commercial product. The methanol crossover degrades the fuel efficiency and reduces the performance of cathode catalyst. Therefore, the approach is to develop a catalyst which catalyzes the oxygen reduction reaction (ORR) but insensitive to the presence of methanol.
    In this study, we used carbon (XC-72) supported cobalt tetra-methoxyphenyporphyrin (CoTMPP/C) as the cathode catalyst. The electrochemical behavior of CoTMPP/C that investigated by polarization of the rotating disk electrode (RDE) was similar to that of Pt/C. The CoTMPP/C, which including 20 wt.% and 163 μg/cm^2 of CoTMPP, prepared by heat treatment at 700℃ shows the best ORR performance and methanol tolerance. For investigating the enhanced behavior, XPS, FTIR, and TG-DTA were employed to characterize COTMPP/C. The formation of Co-N(subscript x)-C(subscript y) and β-Co were observed from above characterizations. We believed that this is the reason that resulting in the increase of ORR performance, but suppressing the methanol oxidation reaction.
    關聯: 華岡工程學報 23期 p.49 -54
    顯示於類別:[工學院] 學報-華岡工程學報

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