質子交換膜燃料電池質傳及電流傳導問題之研究 邱耀輝、鄭錕燦
E-mail: [email protected]
摘 要
本文利用數值計算方法探討質子交換膜燃料電池氣體擴散層 的質傳阻抗與歐姆電阻，以及流道板的歐姆電阻，並對氣體擴 散 層與流道板之間的接觸電阻進行實驗量測。藉以瞭解氣體擴散層 與流道板厚度、氣體擴散層孔隙率、氣體擴散層與流 道接觸面積、 以及流道板與氣體擴散層的接觸壓力等各參數對質傳以及電流傳 導效果的影響。 研究結果顯示：質傳效果 隨著接觸面積的增加而增加，卻也 因為氣體擴散層厚度的增加而減少。當氣體擴散層與流道接觸面 積越大時，氣體擴散 層厚度對質傳效果的影響將減到最低。氣體 擴散層的歐姆電阻遠小於質子交換膜；若以一般導電性良好的金 屬或石墨製 備的流道板，其歐姆電阻亦小於質子交換膜。氣體擴 散層與流道板之間的接觸電阻隨著接觸壓力的減少而變大，接觸 壓 力在10Bar 以內時，接觸電阻在質子交換膜內部電阻即佔有不 可忽略的重要性。
關鍵詞 : 質子交換膜、燃料電池、質傳、歐姆電阻、接觸電阻 目錄
第一章緒論1 1.1 前言...1 1.2 研究動機與目的...2 1.3 燃料 電池簡介...2 1.3.1 發展歷史...2 1.3.2 燃料電池的基本介 紹...3 1.3.3 燃料電池的特色...4 1.3.4 燃料電池的種類與介 紹...4 1.3.4.1 鹼液燃料電池...5 1.3.4.2 磷酸鹽燃料電
池...6 1.3.4.3 熔融碳酸鹽燃料電池...6 1.3.4.4 固態氧化物燃料電 池...7 1.4 文獻回顧...7 第二章研究方
法...10 2.1 質子交換膜燃料電池的原理...10 2.2 質子交換膜燃料電 池的構造...13 2.3 相關理論的推導...15 2.3.1 氣體擴散層的質傳阻 抗...16 2.3.2 氣體擴散層的歐姆阻抗...18 2.3.3 流道板的歐姆阻 抗...19 2.3.4 氣體擴散層與流道板的接觸電阻...20 2.4 分析方
法...21 2.4.1 氣體擴散層的質傳分析...22 2.4.2 氣體擴散層的歐姆 電阻...24 2.4.3 流道板的歐姆電阻...25 第三章結果與討
論...27 3.1 氣體擴散層的質傳阻抗...27 3.1.1 質傳阻抗之經驗公 式...27 3.1.2 濃度等高線圖分析...30 3.1.3 質傳通量比與流道寬度比關 係...32 3.2 氣體擴散層的歐姆阻抗...35 3.3 流道板的歐姆阻
抗...36 3.4 氣體擴散層與流道板接觸電阻的結果探討...37 3.5 各種電阻大小之 比較...37 第四章結論與建議...39 參考文
獻...41 參考文獻
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