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研究生： 劉盈佑
Liu, Ying-yu
論文名稱： 泛溢環境對質子交換膜燃料電池影響之實驗分析研究
Experimental Studies on the Performance of PEMFC under Flooding Environment
指導教授： 賴維祥
Lai, Wei-hsiang
學位類別： 碩士
Master
系所名稱： 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年： 2008
畢業學年度： 96
語文別： 中文
論文頁數： 119
中文關鍵詞： 交流阻抗 、陽極排水 、水管理 、質子交換膜燃料電池
外文關鍵詞： AC impedance, water management, anode water removal, PEMFC
相關次數： 點閱：67  下載：1 
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    • 質子交換膜燃料電池屬於新興的潔淨能源產品，由於其高效率、零排放等優點，引起相當大的矚目，其相關之研究發展活動在近二十年來也相當蓬勃。
    質子交換膜燃料電池之泛溢(Flooding)現象會使其性能輸出不穩定、無法預測及再現性不佳。然而，質子交換膜之導電度又與其含水量有關。當質子交換膜太乾，又會使其歐姆阻抗上升而造成性能衰退。因此，適當的水管理對優化燃料電池性能來說非常重要。
    本研究以反應面積3㎝×3㎝單電池，藉由改變電池本體溫度、增濕氣體溫度、輸出電流等操作條件，依極化曲線及交流阻抗分析之實驗結果，提出對水管理及操作上之建議。
    另外透過改變陽極出口之條件，探討在不同操作條件下，陽極排水法對於電池穩定性之影響。當電池之相對溼度提高時，陽極排水之頻率應隨之提高，才能有效將陽極流道的水排除。

    Proton exchange membrane fuel cells (PEMFCs) are one of the most promising products of alternative energy. It has hold public attention due to its high energy efficiency and zero emissions. Research and development activities are also very vigorous over the past two decades. Flooding phenomenon make the cell performance unstable, unpredictable and unrepeatable. However, the ionic conductivity of the membrane relates to its water content. When the membrane is dehydrated, Its Ohmic resistance of the cell will increase and causes the degradation of performance. Therefore, adequate water management is needed to optimize the cell performance.
    In this study, a single cell has been made with reaction area 3cm×3cm. Different operation conditions such as cell temperature, humidification temperature and output current have been tested. Suggestions about water management and operation have been made according to the experiment result of polarization curve and AC impedance analysis. Besides, the effects of anode water removal on the stability of performance under different anode exhaust conditions are tested. Anode water removal is beneficial to mitigate the flooding of cathode by increasing the back diffusion rate of water. The frequency of purge is needed to increase with the relative humidity to remove the excess water in the anode channel.

    中文摘要 I ABSTRACT II 誌謝 III 目錄 IV 圖目錄 VI 表目錄 X 第一章 緒論 1 1-1 前言 1 1-2 研究動機 8 1-3 文獻回顧 12 1-4 研究目的 15 第二章 理論基礎與設計概念 16 2-1 質子交換膜燃料電池簡介 16 2-1-1 質子交換膜 17 2-1-2 觸媒層 18 2-1-3 氣體擴散層 19 2-1-4 流道板 20 2-2 質子交換膜燃料電池工作原理 22 2-3 水於燃料電池中的傳輸與泛溢 24 2-4 開路電位與極化曲線 26 2-5 交流阻抗分析 32 2-5-1交流阻抗原理 33 2-5-2交流阻抗圖譜 34 2-6陽極排水法 39 第三章 實驗設備 40 3-1 燃料供應系統： 42 3-2 增濕系統及加熱系統： 43 3-3 資料擷取系統： 45 3-4 交流阻抗分析系統 48 3-5 膜電極組熱壓設備： 49 第四章 研究方法 51 4-1 燃料電池各零組件設計與製作 51 4-1-1 氣密層 51 4-1-2 流道 52 4-1-3 集電板 53 4-1-4 端板 53 4-1-5 單電池之組裝 54 4-2 膜電極組製備及活化方法 56 4-3 實驗矩陣 58 第五章 結果與討論 62 5-1 膜電極組活化 62 5-2 不同陰極工作氣體影響及再現性 64 5-3 電池本體溫度與氣體增濕溫度對放電特性之影響 67 5-3-1 電池溫度之影響 67 5-3-2 電池增濕溫度之影響 68 5-4 不同電池溫度與增濕溫度對交流阻抗的影響 72 5-4-1 輸出電流之影響 72 5-4-2 電池溫度之影響 75 5-4-3 增濕溫度的影響 81 5-5 陽極排水法對操作穩定性之影響 87 5-5-1 排水出口之選擇 87 5-5-2陽極出口關斷對操作穩定性之影響 90 5-5-3陽極週期性排水對操作穩定性之影響 96 5-6 不同泛溢程度之即時歐姆阻抗量測 103 5-7 膜電極組之性能衰退 106 第六章 結論 107 第七章 未來工作 110 參考文獻 111

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