以微機電製程製作微型質子交換膜燃料電池之實驗研究

Abstract

摘要 本文主要是研究以微機電製程製作微型質子交換膜燃料電池之實驗研究。探討反應面積為2公分×2公分的單電池。本論文實驗分成兩大部份，一部份是實驗參數測試，另一部份是耐久度測試。實驗參數包括氣體再熱溫度、集電片材料影響、雙極板開孔率影響與陰極氣體比較。 由實驗結果可知，集電片的導電面積與材料對於電池性能有顯著的影響，尤其是前者; 對於增加反應氣體的再熱溫度，微型燃料電池增加的性能有限;雙極板開孔率75%相較於開孔率為50%與67%有最佳的性能曲線;增加陰極氣體空氣的流量，可以改善高電流情況下的濃度極化現象，所以若我們能增加氣體擴散層的擴散能力，則可以減少兩者的性能差距。此外，長時間的測試下，在固定電壓0.4V且長達10小時的耐久度測試後，本實驗所組成的微型質子交換膜燃料電池，測試的性能差距在±2.2%以內。

ABSTRACT This study fabricates micro PEMFC (Proton Exchange Membrane Fuel Cell) by using the MEMS (Micro Electro Mechanical Systems) technology. The active area of the membrane is 2cm×2cm. The study is divided into two categories; one is the parametric experimental investigation, and the other is the durability test. In experimental works, the parameters include reheat temperature, material of current collector slices, open ratio and different cathode gases, respectively. According to the experimental results, both the conducting area and material of current collector slices have great influence on the performance of micro PEMFC, especially the former one. The increment of cell’s performance is finite by increasing the gas reheats temperature. The performance is better for open ratio 75% compared with 50% and 67%. The concentration polarization is improved by increasing the air flow rate at high current density and if the GDL diffusive capability in the latter cell could be promoted, the differences between these two cells’ performances would be reduced. Furthermore, the performance deviation at fixed operating voltage 0.4V is less than ±2.2%.