本研究主要是微型直接甲醇燃料電池（μDMFC）的性能分析及觀測其陽極流道CO2氣泡變化，所使用的流道板是以黃光微影製程（LIGA-Like）及微電鑄技術製作，並以蛇行狀（Serpentine）作為流道的幾何結構，藉由透明壓克力作為兩側端板以觀測陽極流道CO2氣泡的變化。本實驗主要是針對μDMFC陽極CO2產生/排除的過程，配合微質點測速儀（μPIV) 建立可視化觀測的實驗技術，並探討CO2氣泡於液體甲醇溶液和微流道的變化。在實驗操作中以陽極與陰極流量、甲醇濃度及操作溫度為主要參數，探討對於燃料電池的極化曲線與功率密度的影響，並將實驗結果以V-I曲線與P-I曲線表示，並且探討陽極壓力降對於CO2氣泡移動以及性能之間的關係。

The main objective of this research is to analyze the performance of micro direct methanol fuel cell (μDMFC) and observe the bubble behavior of carbon dioxide in the anode flow channel. The flow plate adopted in this study was manufactured through deep UV lithography manufacturing and micro-electroforming manufacturing process. The geometrical configuration of the flow field is in the serpentine form. Transparent acrylic (PMMA: Polymethylmethacrylate) was used to make the terminal plate placed on both sides of the cell in order to facilitate the observation of the bubble behavior of carbon dioxide in the anode flow channel. In this experiment, Micro Particle Image Velocimetry (μPIV) is used in order to investigate the generation / removal process of carbon dioxide from the anode of micro direct methanol fuel cell (μDMFC) through a visualized observation method. The behavior of carbon dioxide bubbles in liquidized methanol solution and micro flowfield is also explored. Major parameters of the experiment operation that consist of flow rate of anode and cathode, density of methanol and operational temperature are used to explore their influences on the fuel cell’s polarization curve and power density. The results are presented by V-I curve and P-I curve. The relation between carbon dioxide bubble movement and behavior according to the anode pressure drop are also discussed.

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 ..................................................................................... 5
1-4 研究目的 ................................................................................... 13
第二章 實驗系統與設備 ......................................................................... 17
2-1 直接甲醇燃料電池組成元件................................................... 17
2-2 直接甲醇燃料電池電化學反應 .............................................. 22
2-3 燃料電池設計要點 ................................................................... 25
2-4 微型直接甲醇燃料電池組元件設計與製作 .......................... 27
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 ......................................................... 40
3-1 實驗設備 ................................................................................... 40
3-2 實驗元件材料 ........................................................................... 44
第四章 燃料電池性能分析 ..................................................................... 50
4-1 電極熱力學 ............................................................................... 50
4-2 極化現象 ................................................................................... 57
4-3 甲醇橫滲 ................................................................................... 60
第五章 誤差分析 ..................................................................................... 64
第六章 結果與討論 ................................................................................. 68
6-1 甲醇濃度對於電池性能的影響 .............................................. 69
6-2 操作溫度對於電池性能的影響 .............................................. 70
6-3 流量對於電池性能的影響 ....................................................... 72
6-4 陽極壓力降對於電池性能的影響 .......................................... 73
6-5 觀測陽極CO2氣泡對於電池性能的影響 .............................. 74
6-6 CO2氣泡排除機制分析 ........................................................... 76
第七章 結論與建議 ................................................................................. 99
7-1 結論 ........................................................................................... 99
7-2 建議 ......................................................................................... 101
參考文獻 ................................................................................................. 102
附錄A ..................................................................................................... 109

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