臺灣博碩士論文加值系統

本文探討陽極氣體擴散層物理特性(厚度、電阻、親疏水性、氣體滲透率)與膜電極組承受高濃度甲醇的相關性，藉由陽極氣體擴散層處理之設計來阻擋甲醇穿透，進一步使電池能操作於高濃度甲醇，提高電池的能量密度與效率。
Case-5 (階梯型微孔層-Gradient micro layer)膜電極組在2M甲醇濃度下最大功率密度為96.4mW/cm-2高於case-2膜電極組(商購穩定熱壓條件)，在8M甲醇濃度下甚至高於case-1膜電極組(商購已熱壓)。利用即時氣體分析儀(RTGA)分析時，發現在8M濃度下偵測到二氧化碳強度比case-1膜電極組小，推估甲醇穿透較少。

This paper investigated physical properties of anode gas diffusion layer (thickness, resistance, contact angle, gas permeability) and the membrane electrode assemblies to bear the high concentration of methanol through the anode gas diffusion layer designed to block methanol to crossover.
The maximum power density of case-5 (gradient micro layer) MEA at 2M methanol concentration is 96.4mW/cm-2.It is better than case-2 MEA commercial MEA at stable hot-pressing conditions). The performance of case at a 8M methanol feed was even better than that the case-1 MEA(hot pressed commercial MEA).

書名頁..............................................ii
論文口試委員審定書 .................................iii
授權書..............................................iv
中文摘要.............................................v
英文摘要............................................vi
誌謝...............................................vii
目錄..............................................viii
表目錄.............................................xii
圖目錄............................................xiii
第一章 緒論........................................1
1.1 前言.............................................1
1.2 質子交換膜燃料電池...............................2
1.3 直接甲醇燃料電池.................................3
1.4 直接甲醇燃料電池與質子交換膜燃料電池差異.........4
1.5 膜電極組(Membrane electrode assembly，MEA).......6
1.6氣體擴散層........................................9
1.7研究動機.........................................11
1.8文獻回顧.........................................11
1.9 研究目的........................................16
第二章 實驗方法與流程..............................17
2.1 電池結構........................................17
2.1.1 薄型電極(Catalyst Coated Membrane)............17
2.1.2 氣體擴散層....................................17
2.1.3 膜電極組......................................17
2.1.4 防漏墊片......................................18
2.1.5 石墨流道板....................................18
2.1.6 集電板........................................18
2.2 實驗操作條件與設備..............................19
2.2.1 燃料電池機台操作步驟..........................19
2.2.2 交流阻抗分析..................................19
2.2.3 即時氣體分析儀（Real Time Gas Analyzer）......20
2.3 氣體擴散層處理..................................21
2.3.1 氣體擴散層疏水處理............................21
2.3.2 微孔層製備....................................21
2.4 擴散層物理性質量測工具..........................22
2.4.1 厚度..........................................23
2.4.2 導電性........................................23
2.4.3 氣體滲透率....................................24
2.4.3 接觸角........................................25
第三章 實驗結果與討論...............................27
3.1 氣體擴散層物理性質量測..........................27
3.1.1 氣體擴散層處理對厚度的影響....................27
3.1.2 氣體擴散層處理對電阻的影響....................28
3.2 商購膜電極組....................................30
3.2.1 熱壓對膜電極組影響............................30
3.2.2 熱壓參數調整..................................30
3.3 不同甲醇濃度對膜電極組影響......................31
3.3.1 極化曲線......................................31
3.3.2 甲醇穿透定性分析..............................34
3.4 膜電極組在不同甲醇濃度下交流阻抗...............34
3.5 膜電極組在不同甲醇濃度下定電壓放電..............35
3.6 多孔鈦膜電極組..................................36
第四章 結論與未來展望...............................38
4.1 結論............................................38
4.2 未來規劃........................................39
參考文獻............................................73

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