矩形大面積質子交換膜燃料電池膜電極組製程開發研究

Abstract

本論文著重於質子交換膜型燃料電池的關鍵-膜電極組，包含質子交換膜、觸媒層、氣體擴散層，以及膜電極組的製作方法和測試結果。 膜電極組是採用Nafion212，反應面積為250mm*100mm，並使用CCM製程來塗佈，測試矩形大面積燃料電池在常溫30℃的性能，操作條件在氫氣加濕30℃(相對濕度100%)，氧氣加熱30℃，流量皆為0.4SLM時，氫氣端和氧氣端觸媒量都是0.6 mg/cm2，使用噴塗的方式，在垂直擺設由上/上進氣時，可得到電池最佳性能在0.64V時，電流密度為174.3 mA/cm2。 在MEA製程中，當質子交換膜塗佈時，膜會產生皺縮和膨脹問題，利用自製夾具和底部加熱系統，將此問題解決。噴塗的優點在於能將觸媒霧化塗佈在膜上，均勻度較好。噴塗的缺點是觸媒容易堆積在管線和噴嘴中，造成觸媒耗損較多，如能改進塗佈器具，將能使觸媒耗損降低。在自動化塗佈時，如能維持觸媒漿料持續提供，將能使製作時間大幅縮短。

This thesis focuses on the proton exchange membrane fuel cell - Membrane Electrode Assembly (MEA), including proton exchange membrane, catalyst layer, gas diffusion layer, and the manufacture method of the MEA and test result. The MEA adopts Nafion212, the active area is 250mm *100mm, the catalyst coated membrane method is used as the coating technique, the cell test the performance under the room temperature. The fuel are 30℃ hydrogen gas of 100% relative humidity and 30℃ oxygen gas. Both hydrogen and oxygen gas flow rate are 0.4 SLM. The catalyst loading for anode and cathode is 0.6 mg/cm2. The spraying technique of MEA fabrication is used. At vertical position from top to button. The best performance in this study is 174.312mA/cm2@0.64V. In this study, the swelling problem of the proton exchange membrane in MEA fabrication is solved by using the self-manufacture jig and the heating system below the membrane. Advantage of spraying, the catalyst source is transform into micro droplet through the spraying technique, which can make an uniform catalyst layer. The shortcoming of spraying is that a catalyst is apt to be piled up in the pipeline and spray nozzle, cause catalysts to consume more, if can improve the coating tool, can make the consuming amount of catalyst reduce. In the automatic coating, if can keep the ink of catalyst to offer continuously, can enable making time to shorten.