本實驗目的在於少量且均勻的供給燃料使甲醇能在陽極完全反應完畢，以達成無Crossover發生的條件。本實驗主要探討影響蒸汽式甲醇燃料電池在時間響應上的因素。
第一探討影響蒸汽式甲醇燃料電池系統時間常數(time constant)之因素，本研究改變不同單極板結構，希望可藉由減少甲醇儲存空間，來減少電流下降的時間常數。此外，藉由減少陽極電池組厚度與減少球型閥上方空間來縮短電流下降的時間常數。將球型閥結構改為滑板結構，因有效縮短甲醇的擴散距離，可使電流上升曲線的時間常數縮短。
第二探討甲醇蒸汽的供應量對系統穩態電流的影響，利用球型閥的高氣密性，可使電極在未發生crossover的狀況下，甲醇利用率達94％以上。於滑板結構實驗中發現穩態電流值的高低主要取決於孔洞面積的大小，與所接的電阻大小並無關。然而到達穩態電流所需時間，會隨所接的電阻越小而縮短。
第三探討系統在穩態電流長時間測試下是否造成性能衰退，實驗發現電極會因膜的含水量減少而性能逐漸降低。

To ran a DMFC without methanol crossover is the aim of this study.It is done by supplying fuel no more than what the anode can consume.
The first is to explore the factors that may affect the time constant of vapor feed DMFC. In order to reduce the time constant of current decline, first, we decrease store tank’s space of methanol with different structure of unipolar plate. Second, we reduce the thickness of anode stack and the space above the air bleed valve. Using slide plate instead of air bleed valve can shorten the diffuse distance effectively and reduce the time constant of current rise curve.
The second is to explore the impact of supply of methanol on steady-state current of system. Using air bleed valve, because of its high gas tightness, the utilization rate of methanol can exceed 94% without crossover. It was found that in the slide plant experiment, steady-state current value depends mainly on the pore size of slide plate, and resistance value has nothing to do. However, the resistance value is lower, the time required to reach steady-state current is shorter.
The third is to explore if the performance decay after long time test of steady-state current. It was found that the performance of MEA will decay while the water content of membrane decreased.

目錄 I
摘要 V
Abstract VI
第一章 緒論 1
1.1 前言 1
1.2 燃料電池的介紹 2
1.3 研究目的與動機 5
第二章 直接甲醇燃料電池基本架構 7
2.1 直接甲醇燃料電池的結構 7
2.1.1 質子交換膜 7
2.1.2 催化劑(觸媒) 9
2.1.2.1 陰極觸媒材料 9
2.1.2.2 陽極觸媒材料 10
2.1.3 DMFC陽極 11
2.1.3.1 擴散層 11
2.1.3.2 催化層 11
2.1.4 DMFC陰極 12
2.1.4.1 擴散層 12
2.1.4.2 催化層 13
2.1.5 膜電極組製作方式 13
2.1.6 膜電極組(Membrane Electrode Assembly，MEA) 15
2.1.7 雙極板(Bipolar Plate) 15
2.2 文獻回顧 18
第三章 直接甲醇燃料電池(DMFC)工作原理 26
3.1 DMFC反應原理 26
3.2 DMFC的極化現象 27
3.3 燃料電池的極化曲線 29
第四章 實驗材料及實驗儀器 30
4.1 實驗器材 30
4.1.1 實驗材料 30
4.1.2 實驗設備 31
4.2 MEA製作 39
4.2.1 Nafion117質子交換膜的預處理 39
4.2.2 MEA 電極製作 40
4.2.3 漿料調配 40
4.2.4 噴塗試片製作 41
4.3 STACK 製作 44
4.3.1 蒸汽式甲醇燃料電池組設計構想 44
4.3.2 製作stack 的材質 45
4.4 燃料與氧化劑 46
4.5 性能測試 46
4.6 DAQ 卡資料擷取系統與KEITHLEY 2000 資料擷取軟體 47
第五章 實驗方法與結果分析 48
5.1 實驗規畫 48
5.2 甲醇氣體分子的擴散速率公式4 9
5.2.1 探討影響蒸汽式甲醇燃料電池時間常數之因素 50
5.2.2 定置型孔徑板結構電池設計 51
5.2.3 滑板結構孔徑控制板電池設計 52
5.2.4 探討陽極不同單極板結構對時間常數之影響 53
5.2.5 探討藉由改變陽極電池組厚度而減少甲醇儲存空間對時間常數的影響 54
5.2.6 探討定置型孔徑控制板與滑板結構孔徑控制板時間常數的差 56
5.2.7 探討減少陽極電池組內部空間對滑板結構時間常數的影響 57
5.2.8 估計電極在不同電流值消耗催化層中的甲醇所需時間 58
5.3 探討甲醇蒸汽的供應量對系統穩態電流的影響 60
5.3.1 探討定置型孔徑控制板甲醇的供應量對系統穩態電流的影響 60
5.3.2 探討滑板結構孔徑控制板甲醇的供應量對系統穩態電流的影響 61
5.4 探討滑板結構孔徑控制板長時間測試對性能的影響 62
5.5 探討負載變化對系統時間常數的影響 63
第六章結論與建議 66
6.1 結論 66
6.2 建議 67
參考文獻 68

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