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題名 | 燃料電池膜電極組老化分析=The Degradation Test Evaluation for Proton Exchange Membrane Fuel Cell |
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作者 | 柯世宗; Ke, Shih-tsung; |
期刊 | 新新季刊 |
出版日期 | 20140100 |
卷期 | 42:1 2014.01[民103.01] |
頁次 | 頁108-114 |
分類號 | 468.1 |
語文 | chi |
關鍵詞 | 質子交換膜燃料電池; 加速老化測試; 質子交換膜; 觸媒; 膜電極組; Proton exchange membrane fuel cells; Accelerate degradation technique; Membrane electrode assembly; Catalyst layer; Composite membrane; |
中文摘要 | 燃料電池的應用範圍廣泛,因此在能源及環境污染危機的現今,此技術是個極為吸引人們目光的新產業,但燃料電池目前所面臨的問題主要以成本及使用壽命為兩大主軸,而要克服這兩大難題還是要以燃料電池的關鍵材料著手,然而PTFE/Nafion複合膜因具有低成本、高機械強度、高尺寸安定性與耐高溫等特性,因此本文以PTFE/Nafion複合膜電極組進行加速老化測試,並藉由「In-situ」的電化學分析方法及「ex-situ」的材料分析方法來探討各零組件老化因素;實驗結果顯示PTFE/Nafion複合膜電極組加速老化後,其放電效能低於Nafion211膜電極組,從分析上觀察雖觸媒老化會影響放電效能,但影響PTFE/Nafion複合膜電極組老化最關鍵的因素應是在乾/濕循環的操作環境下,造成膜材剝離,膜電極組內部阻抗增加所致,因此改善膜材PTFE及Nafion間的界面接著應可改善PTFE/Nafion複合膜的老化現象。 |
英文摘要 | Cost and durability are the main issues of Proton exchange membrane fuel cells (PEMFCs) commercializing. This study uses the accelerate degradation technique to analyze the durability of low cost PTFE/Nafion and Nafion211 membrane electrode assembly (MEA). Before the MEA degradation experiment, the MEA must be activated at 65℃ until the performance is stable. Then increase the operation temperature to 80℃. The experimental process for MEA degradation contains three steps in one cycle. The first step is to open circuit voltage (OCV) for 30 sec under R.H. 100%. Then, set 0.6V for 150 sec under R.H. 100%. The final step is to set 0.6V for 120 sec under R.H. 0%. These three steps take around 5mins to complete. This MEA degradation experiment process includes the OCV, potential cycles, and R.H. cycles. This research applies the in-situ and ex-situ such as polarization curve, AC impedance, linear sweep voltammetry (LSV) to analysis the changes of MEA. Before 280 experiment cycles, the result shows that the catalyst degradation is the main reason for the decay of MEA. During 280~640 cycles, the MEA occurs creep deformation which is due to the R.H cycle. And during 640~1040 cycles, it implies a transition state from a slight membrane crack to a serious one, and the burning reaction accelerates the MEA degradation dramatically when the membrane has been broken. From the experimental demonstrated this ADT could reduce the experimental time of degradation dramatically. Linear sweep voltammetry and high frequency resistance can be used to estimate the degree of MEA degradation approximately. |
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