臺灣博碩士論文加值系統

本實驗之微型直接甲醇燃料電池的流道板是以微機電技術以及微電鑄技術製作，並以蛇行狀作為流道的幾何結構。在實驗操作中主要以陽極與陰極流量、甲醇濃度、操作溫度作為主要參數，探討這四項參數對於甲醇及水橫滲量的影響，而由於甲醇及水橫滲會直接影響性能，因此再進一步探討橫滲量與性能的關係，實驗結果以PI曲線與VI曲線表示，可以發現在低溫下流量提高對於甲醇橫滲並不影響，但隨著溫度越高，流量及壓降提高，橫滲會因此提高，並開始對於性能產生不良的影響。同時利用陽陰極之間壓力差這參數，探討對於橫滲量以及性能之間的關係，在高溫下性能會提高，但相對地橫滲也會因而增加，藉由此次實驗得知高溫(75℃)下當陽極流量大於6 sccm，性能就會因為橫滲影響開始衰退。

In this study, the flow plates of micro methanol fuel cells are designed and fabricated in-house through MEMS(Micro-Electro-Mechanical System) technology with deep UV lithography manufacturing processes (SU-8 photoresist) and micro electroforming manufacturing processes. The thesis investigates methanol and water crossover in a micro DMFC for serpentine flow field configuration. Experiments are conducted through various experiments with different operating conditions for the anode flow rate (2-10 sccm), cathode flow rate (100-500 sccm), methanol concentration (1, 2 and 3M), and temperature (25, 50 and 75℃). Experimental results are presented in the form of polarization VI curves and PI curves under the above operating conditions. The experimental results show that the methanol and water crossover flux increases with increases in cell temperatures, methanol concentration and anode pressure drop. It is found that the fuel efficiency of the DMFC is closely related to the methanol crossover. Further examination of the relationship between the methanol crossover and cell performance reveals the possibility of reducing the methanol crossover by optimizing the anode flow rate.

目錄 i
表目錄 iii
圖目錄 iv
符號說明 vi
中文摘要 viii
英文摘要 ix
第一章　序論 1
1-1 前言 1
1-2 燃料電池發展之背景 3
1-3 文獻回顧 4
1-4 研究目的 11
第二章　實驗系統與設備 15
2-1 直接甲醇燃料電池組成元件 15
2-2 直接甲醇燃料電池電化學反應 21
2-3 燃料電池設計要點 24
2-4 微型直接甲醇燃料電池組元件設計與製造 26
2-5 微型直接甲醇燃料電池組裝 31
第三章 實驗相關設備與元件材料 38
3-1 實驗設備 38
3-2 實驗元件材料 43
第四章　燃料電池性能分析 48
4-1 前言 48
4-2 電極熱力學 49
4-3 極化現象 56
4-4 甲醇橫滲 60
第五章　誤差分析 64
第六章　結果與討論 68
6-1 甲醇濃度對橫滲與電池性能的影響 70
6-2 操作溫度對橫滲與電池性能的影響 71
6-3 流量對橫滲與電池性能的影響 72
6-4 壓力降對橫滲與電池性能的影響 74
第七章　結論與建議 95
7-1 結論 95
7-2 建議 97
參考文獻 98
附錄 A 105

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