非貴重金屬觸媒於直接甲醇燃料電池之研究

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Title:	非貴重金屬觸媒於直接甲醇燃料電池之研究
Authors:	許新城;張孫堂;林麗瓊;陳貴賢;施漢章
Contributors:	工學院
Keywords:	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
Date:	2009-01-01
Issue Date:	2012-03-28 13:39:10 (UTC+8)
Abstract:	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.
Relation:	華岡工程學報 23期 p.49 -54
Appears in Collections:	[College of Engineering] Chinese Culture University Hwa Kang Journal of Engineering

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