腐蝕特性對金屬多孔材質子交換膜燃料電池性能影響之研究

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吳佩蓉(Pei-Jung Wu) 查詢紙本館藏

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能源工程研究所

論文名稱

腐蝕特性對金屬多孔材質子交換膜燃料電池性能影響之研究
(Study on corrosion properties of the metal foam in PEM fuel cell)

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摘要(中)

本研究在金屬多孔材表面鍍上不同鍍層，分析鍍層的表面形貌、接觸角、接觸阻抗與抗腐蝕能力，更進一步組裝成單電池，進行電池性能測試、EIS測試與長時間穩定性測試，以了解不同表面處理的腐蝕特性對金屬多孔材燃料電池性能之影響。
　　氮化鈦鍍層在腐蝕前後表面形貌沒有明顯改變；接觸角結果顯示，PTFE疏水處理可增加表面的疏水特性，經處理後所有樣本的接觸角皆可提升至120 o以上，腐蝕測試後以氮化鈦鍍層的接觸角變動最小，具最佳的疏水特性；銀鍍層的表面形貌較平坦，因此接觸阻抗最小，其次為氮化物鍍層、碳鍍層最差；在腐蝕極化測試中以氮化物鍍層表現最佳，於PH=3、80 oC硫酸環境中之腐蝕電流密度為9.33x10-7 A/cm2，符合DOE目標，由鍍層表面特性均顯示氮化鈦鍍層具極佳的抗腐蝕能力。
　　氮化鈦鍍層單電池亦有優異的表現，在電池操作溫度60 oC下有1199 mA/cm2之電流密度輸出，且在長時間測試中穩定輸出27.5 A，為反映氮化鈦鍍層於抗蝕性與疏水性之優勢，在現今貴金屬飆漲的趨勢中，是相當具有應用潛力之表面處理方法。

摘要(英)

In this study, TiN, Ag and C were coated on the metal foam. SEM, contact angle, interfacial contact resistancen and electrochemical methods were used to characterize the corrosion properties of the different coatings. Furthermore, these surface treated metal foams were used in single PEMFC. I-V curves, long-term cell performance and EIS were measured to investigate the effects of corrosion properties of metal foams on the performance of single PEM fuel cell.
　　Results from the contact angle measurement showed that PTFE treatment increased the hydrophobicity of metal foams. All PTFE-treated samples had a contact angle larger than 120  and TiN coating had the best hydrophobicity. Poteniodynamic test measured in PH=3 H2SO4 solution showed that the TiN-coated sample had the best corrosion resistance. The corrosion current density of TiN at 80 oC was 9.33x10-7 A/cm2, which meets the DOE target for metallic bipolar plate.
　　For cell operated at temperature of 60 C and atmospheric pressure, the current density at 0.6 V for the cell with TiN-coated metal foams reached 1199 mA/cm2. Long term stability test also showed that the cell could maintain stable current output in 100 hours. These results demonstrate that TiN is a promising surface coating of metal foam for low temperature PEMFC use.

關鍵字(中)

★ 燃料電池
★ 金屬多孔材
★ 表面處理
★ 腐蝕極化測試
★ EIS

關鍵字(英)

★ Fuel cell
★ Metal foam
★ Coating
★ Corrosion
★ EIS

論文目次

目錄
中文摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vii
圖目錄 ix
符號說明 xvi
第一章緒論 1
1-1 前言 1
1-2 燃料電池簡介 2
1-2-1 液態電解質燃料電池 2
1-2-2 固態電解質燃料電池 4
1-3 質子交換膜燃料電池 5
1-3-1 質子交換膜燃料電池之構造與工作原理 5
1-3-2 質子交換膜燃料電池之極化現象 8
1-4 研究動機與目的 9
第二章文獻回顧 11
2-1 金屬雙極板抗腐蝕 11
2-1-1 貴金屬鍍層 11
2-1-2 氮化物鍍層 14
2-1-3 其他鍍層 16
2-2 金屬多孔材應用於燃料電池 17
2-3 電化學交流阻抗頻譜分析 19
第三章實驗分析原理 22
3-1 腐蝕電化學原理 22
3-1-1 混合電位理論 22
3-1-2 極化曲線 23
3-2 電化學交流阻抗頻譜原理 24
3-2-1 燃料電池測試原理 24
3-2-2 燃料電池等效電路模型 25
第四章實驗方法與實驗設備 27
4-1 實驗架構 27
4-2 鍍層製備與規格 27
4-3 接觸阻抗量測 28
4-4 接觸角量測 29
4-5 腐蝕極化量測與EIS量測 30
4-6 燃料電池規格 31
4-7 燃料電池測試條件 32
4-7-1 電池性能與長時間穩定性測試 33
4-7-2 燃料電池測試機台 34
第五章實驗結果與討論 36
5-1 表面形貌分析 36
5-2 接觸角量測結果 38
5-3 接觸阻抗量測結果 41
5-4 腐蝕極化測試結果 44
5-5 單電池性能分析 50
5-5-1 不同鍍層表面處理對電池性能之影響 50
5-5-2 不同操作條件對不同鍍層單電池性能之影響 52
5-6 交流阻抗頻譜分析 56
5-6-1 不同鍍層表面處理對電池性能之影響 56
5-6-2 不同操作條件對不同鍍層單電池性能之影響 59
5-7 電池性能長時間穩定性分析 62
第六章結論與未來方向 66
參考文獻 69

參考文獻

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指導教授

曾重仁(Chung-jen Tseng)

審核日期

2013-8-28

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