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標題: | 大面積質子交換燃料電池膜電極組直接塗佈製造技術研究 Experimental Studies of Catalyst Coated Membrane Method within large Membrane Electrode Assomblies of PEMFC |
作者: | Ji-Chieh Lin 林義傑 |
指導教授: | 郭景宗 |
關鍵字: | 質子交換膜型燃料電池,膜電極組,直接塗佈, PEMFC,MEA,CCM,nafion117, |
出版年 : | 2006 |
學位: | 碩士 |
摘要: | 本論文著重於質子交換膜型燃料電池(PEMFC)的關鍵---膜電極組,並一一做介紹,包含膜電極組的組成零件,質子交換膜(PEM)、觸媒層(CL)、氣體擴散層(GDL)、膜電極組(MEA)的製作方法以及測試的結果。在本論文中採用觸媒直接塗佈於質子交換膜上的作法(CCM)。薄膜上的觸媒層緊密的與質子交換膜接觸在一起,改善了觸媒層與質子交換膜中的接觸。為了克服使用直接塗佈漿料,質子交換膜會發生皺縮(sewlling)的現象,採用自製的夾具固定質子交換膜克服皺縮。
膜電極組採用Nafion117,(反應面積140mmX140mm),當陰極觸媒量0.6 ,陽極觸媒量0.5 。氫氣加濕90 ,電池操作溫度50 時擁有最佳性能,在0.644V下,電流密度285.7 ,產生36.04W。實驗結果反應出,陽極端的加濕比率對於電池操作在高電流密度下影響甚巨。 此研究也介紹了電池組的介紹、設計、製造與組裝,在電池組中包含了兩個電池以及水冷系統,在1V下電流密度250 ,產生68W。 本文對於MEA的製作方法不同於以往,可看出某些方法對於MEA性能有所改善,若能將這些製程制式化,甚至減少材料用量,則可對於燃料電池成本降低有所助益。 The membrane electrode assembly (MEA) and the stacks play an important role on the performance of a proton exchange membrane fuel cell (PEMFC). In this work, MEAs were fabricated by catalyst coated substrate method and by catalyst coated membrane method. Experiments were carried out in this work to investigate the influence of operating conditions on the performance of Mea. The operating parameters include the catalyst loading, temperature of the cell, temperature of hydrogen humidification, H2/O2 ratio, etc. The membrane electrode assembly was fabricated by coating the catalyst (Pt black) on the surface membrane directly to improve the continuity of interface between the catalyst film and the membrane. Nafion117 was adopted as the membrane electrode assembly with the active area of 140 mm x 140 mm. The optimum performance of the MEA made in this work was found to be 36.04 W at 0.644 V and 285.7 mA cm-2, corresponding to the conditions as: Pt loading at the cathode and at anode side is 0.6 and 0.5 mg cm-2, respectively; cell temperature of 50℃, and the hydrogen humidification temperature of 90℃. The single PEMFC and the two-cell stack type PEMFC were tested in this study to evaluate the correlation between the current density and the voltage. Experimental results show that as for the single-fuel PEMFC, the power output of MEA fabricated by catalyst coated substrate method is higher than which made by catalyst coated membrane method, to the extent around 30%. The system was operated for 8000 min continuously, with the current lowered down only about 2%. On the other hand, the power out of the two-cell stack type PEMFC per cell is slightly lower than that of the single cell system, owing to water choking inside the channel. Since the flow pattern of reactant gases in the two-cell stack is more complex than that in the single-cell unit, the heat insulation should be designed specifically to avoid the moisture condensation. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/25715 |
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顯示於系所單位: | 機械工程學系 |
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