博碩士論文 103328030 詳細資訊




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姓名 王?萱(Jing-Xuan Wang)  查詢紙本館藏   畢業系所 能源工程研究所
論文名稱 金屬發泡材特性對高溫型質子交換膜金屬發泡材燃料電池之影響
(Effects of Metal Foam Properties on the Performance of High Temperature PEM Fuel Cells with Metal Foam Flow Distributors)
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摘要(中) 為將陽極端流道減薄,本研究使用不同規格金屬發泡材,探討其孔洞數與厚度對其孔徑、孔隙率、滲透率與電阻值之影響,並應用於高溫型質子交換膜燃料電池,且將薄化之最佳結果與實驗室原設計進行比較,以及探討操作溫度、加濕溫度、氣體背壓與空氣當量比等參數對電池性能之影響。
研究結果顯示,在金屬發泡材物理特性分析中,能使用雷諾數與摩擦因子之關係建立不同規格金屬發泡材之氣體擴散性。在燃料電池研究上,當流量固定時,厚度減薄會使氣體流速變快,故使用滲透率較低之發泡材能有效薄化流道並維持電池性能,而本研究成功建立發泡材之穆迪圖與電池性能及交流阻抗分析之結果相符。與原設計相比,最佳條件之設計可將陽極端減薄30.8 %與單電池總重量減少20 %,在0.6 V之性能提升11.5 %。操作參數之結果顯示,增加溫度、背壓與空氣當量比皆能提升電池性能,唯有加濕對電池性能影響不大。
摘要(英) In order to reduce the thickness and weight of the metallic flow distributor plate, the effects of channel depth, pore size and thickness of metal foam are investigated. Relation between pore size, thickness and the permeability and electrical resistance of the metal foam were first established. Then, these metal foams were applied to high temperature proton exchange membrane fuel cell. The performance of new design were compared with previous design. Moreover, effects of cell temperature, humidification, back pressure and air stoichiometry were also studied.
The results of fuel cells show that the lower permeability of metal foam was favorable for the thinner flow channel. The reason is that, for fixed flow rate, gas velocity is increased with the thinner flow channel and lower permeability increases the probability of gas moving into the reactive area. The fuel cell performance agrees well with the electrochemical impedance results. Compared with previous design, the optimized design reduces 20 % cell weight, while increasing 11.5 % cell performance at 0.6 V. Results also show that increasing temperature, back pressure and air stoichiometry improves the cell performance. However, the degree of humidification does not substantially affect cell performance.
關鍵字(中) ★ 金屬發泡材
★ 流道薄化
★ 高溫型質子交換膜燃料電池
關鍵字(英) ★ metal foam
★ flow channel depth reduction
★ HT-PEM fuel cell
論文目次 中文摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vii
表目錄 xi
符號說明 xiii
第一章 緒論 1
1-1 前言 1
1-2 質子交換膜燃料電池 4
1-2-1 質子交換膜燃料電池之工作原理 4
1-2-2 質子交換膜燃料電池之組成結構 6
1-2-3 質子交換膜燃料電池之極化現象 10
1-3 電化學交流阻抗基本原理 12
1-4 研究動機與目的 14
第二章 文獻回顧 16
2-1 金屬發泡材特性之研究與應用 16
2-2 高溫型質子交換膜燃料電池 18
2-3 電化學交流阻抗分析 20
第三章 實驗方法與實驗設備 22
3-1 實驗架構與流程 22
3-2 截面結構分析 23
3-3 孔隙率量測 25
3-4 滲透率量測 26
3-5 接觸阻抗量測 27
3-6 燃料電池測試系統 29
3-7 電化學交流阻抗分析儀 32
3-8 燃料電池規格 35
3-8-1 膜電極組 36
3-8-2 矽橡膠氣密墊片 36
3-8-3 鎳金屬發泡材 37
3-8-4 金屬雙極板與流道 38
3-8-5 端板 38
3-9 燃料電池實驗條件 39
第四章 結果與討論 40
4-1 不同PPI之截面分析 40
4-2 不同規格金屬發泡材與孔隙率之關係 41
4-3 金屬發泡材之氣體擴散性分析 41
4-3-1 PPI與滲透率之關係 41
4-3-2 厚度與滲透率之關係 43
4-3-3 流速與雷諾數之關係 46
4-3-4 流速與摩擦因子之關係 47
4-3-5 雷諾數與摩擦因子之關係 48
4-4 金屬發泡材之電性分析 49
4-4-1 PPI與碳紙之接觸阻抗 49
4-4-2 厚度與碳紙之接觸阻抗 50
4-5 單電池性能測試與交流阻抗分析 52
4-5-1 陽極端流道薄化對電池性能之影響 52
4-5-2 薄化設計與實驗室原設計之比較 61
4-5-3 溫度對電池性能之影響 64
4-5-4 加濕對電池性能之影響 69
4-5-5 背壓對電池性能之影響 72
4-5-6 陰極端當量比對電池性能之影響 76
第五章 結論與未來規劃 81
5-1 結論 81
5-2 未來規劃 83
參考文獻 84
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指導教授 曾重仁(Chung-jen Tseng) 審核日期 2017-1-18
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