由於在PEMFC的氣體擴散層製作微柱結構電極，可以大幅提升電池性能，因此本論文將研究微柱結構若運用於DMFC陽極時，是否能同樣有提升電池性能的功用。
我們將電池運作在室溫、自然吸氣的條件下測試電池性能，實驗結果卻發現微柱結構電極與傳統平面電極兩者性能曲線相當接近，推論決定DMFC電極性能的主要反應區並非在觸媒層表層，造成微柱結構製作在DMFC陽極時性能並沒有提升的主要因素。因此我們試著改變實驗條件的參數，將甲醇水溶液升溫(50℃)與降低甲醇濃度(0.5M)，探討是否能夠讓甲醇僅反應在觸媒層表層，但實驗結果卻發現微柱結構電極與傳統平面電極性能依然相當接近。
目前DMFC所測試的電流密度都還在小功率0~25mW/cm2範圍進行，而PEMFC反應產生的電流密度都在大功率400mW/cm2以上運作，因此建議未來若能將電池操做溫度升高與在陰極通入氧氣，使電池在大電流下運作，在導入微柱結構電極或許有發揮效用的可能性。
最後，我們試著將本實驗自製電極與商用電極(E-TEK)的性能做比較，發現在室溫、自然吸氣的運作條件下，其兩種電極性能相當且最大功率密度皆可達到17mW/cm2。

Due to the micro-pillar-structured electrodes were made in the gas diffusion layer (GDL) of the proton exchange membrane fuel cell (PEMFC), the cell performance was raised significantly; the study therefore aims to understand whether the same cell performance can be achieved if the micro-pillar-structures were made in the direct methanol fuel cell (DMFC) of the anode.
At room temperature and naturally breathed air, the performance of the micro-pillar-structured electrodes was the same as the conventional electrodes. The performance of the electrodes does not rely on the surface area between the micro porous layers and the catalyst. The experimental results inference indicates that no efficiency can be completed. The study then changed the experimental condition, i.e. increased the temperature of the methanol-water solution to 50℃ and reduced the methanol concentrations to 0.5M. The purpose was to carry out the reaction of the surface between the methanol and the catalyst layer. However, the experimental result shows no variation between the micro-pillar- structured electrodes and the conventional electrodes.
Because of the test of the current density of the DMFC was carried out in a small power (0~25mW/cm2). The current density of the PEMFC was carried out in a high power (400mW/cm2 ~). The study proposed that the cell operating temperature can be raised and the oxygen can be put in the cathode, the performance of the micro-pillar-structured electrodes can thus be enhanced if the reaction was in a high current density.
At the finals, the study tried to compare the efficiency between self-made electrodes and commercial electrodes (E-TEK). The result showed that both max power densities can reach 17mW/cm2 at room temperature and naturally breathed air.

目錄……………………………………………………….……..……. ...I
圖目錄 …………………………………………………….………..… IV
論文摘要(中文)………………………………………………….……VII
論文摘要(英文)……………………………………………………...VIII
第一章 緒論……………………...………………….………….….1
1.1 前言…………………………………………………………….1
1.2燃料電池之種類…….………..…………………………..…….2
第二章 MEA的介紹............…………….….……………….……6
2.1 膜電極的介紹…….……...………………..……….....………..6
2.1-1質子交換膜…...………………..………….….....………..6
2.1-2觸媒層…...………………..………….….............………..7
2.1-3氣體擴散層……..………….…............................………..8
2.2 研究動機與目的……...………………..……….....……….…..8
2.3 文獻回顧……...………………..……….....……………… …..9
第三章 DMFC的反應原理與極化現象....…………….….....17
3.1 DMFC電極催化反應原理….………..……………….............17
3.2 DMFC的極化現象…………..………….…….........................18
3.3 極化曲線(polarization curve)…................................................20
第四章 電池的製作與設備材料…….…..….………………....22
4.1 DMFC電池結構的介紹………………..……….…….….......22
4.1-1電池結構的設計………..……….…….….....................22
4.1-2雙極板的介紹……….…….….......................................22
4.2 MEA的製作流程…….…….….................................................24
4.2-1質子交換膜的改質處理.................................................24
4.2-2觸媒漿(ink)的備製........................................................24
4.2-3電極的製作.....................................................................25
4.2-4 MEA熱壓步驟...............................................................26
4.3 電池的測試...............................................................................26
4.4 MEA實驗的材料.....................................................................27
4.5實驗設備....................................................................................28
第五章 實驗結果與分析...................................................……...31
5.1 噴灑法與滴塗法的電極製作對於性能影響…………...........31
5.2 MEA熱壓完後經煮稀硫酸與去離子水後性能的探討..............32
5.2-1 MEA熱壓後水分揮發對於性能的影響..........................32
5.2-2 MEA熱壓後煮稀硫酸與去離子水後對於性能的影響.33
5.3 探討不同GDL結構對電極性能之影響.....................…….…33
5.3-1 三種不同GDL的製作過程與介紹...................…….…34
5.3-2 量測三種不同GDL的表面接觸電阻.........……….….…35
5.3-3 觀察噴灑觸媒於GDL表面與剖面的分佈情況………35
5.3-4 三種不同GDL結構對電極性能的影響………………36
5.4 在催化層製作微柱結構對於DMFC性能的探討.......................37
5.4-1 微柱結構尺寸的介紹…………………………………..37
5.4-2 微柱狀電極結構的製作步驟…………………………..38
5.4-3 微柱狀結構與傳統結構電極對性能的影響與探討…..39
5.5 甲醇水溶液升溫對微柱狀結構與傳統結構電極性能的影響…………………………………………………..…………40
第六章 結論與建言.........................................................…........42
6.1 結論………..…………………………….……..……………..42
6.2 建言…..............................……….................................………43
參考文獻…………………………………………………………..…....44

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