金屬發泡材質子交換膜燃料電池之研究; Metal Foam in Proton Exchange Membranes Fuel Cell

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题名:	金屬發泡材質子交換膜燃料電池之研究;Metal Foam in Proton Exchange Membranes Fuel Cell
作者:	陳孟怡;Meng-Yi Chen
贡献者:	機械工程研究所
关键词:	交流阻抗;電池堆;質子交換膜;金屬發泡材;fuel cell stack;proton exchange membrane fuel cell;AC impedance;metal foam
日期:	2009-06-30
上传时间:	2009-09-21 12:07:45 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究是使用金屬雙極板與金屬發泡材，組成質子交換膜燃料電池之單電池與電池堆，且搭配不同的商用膜組，探討反應物流量、操作溫度、加濕溫度等，對電池性能之影響。金屬板導電性能佳、機械性能強度好，適合作為雙極板的材料；使用金屬發泡材取代傳統內流道的作法，在單電池上已被證實有傑出的性能。本研究目的即是在觀察，此組合應用在電池堆時，其性能表現與運作特徵。另外，亦進行電池堆之長效測試與電池堆之交流組抗分析。由實驗結果可知，增加空氣流量對於電池性能有顯著的增加；而氧氣流量對於電池堆的影響，則有其極限值存在。電池溫度與加濕溫度的適當配合，有助於電堆性能的提昇。長時間測試，對於電堆研究開發有著很大的影響，定時的增加陰極端流量，有助於陰極端的排水控制，也可改善濃差極化的現象。而由電池放電的極化曲線、及交流組抗分析的結果，可建立出一合理的等效電路模型，並確認此電池系統中，最主要的反應阻力來源為質傳阻抗。並藉此分析結果，以討論未來電池堆的性能提昇之研發方向。 Metal foam is used in this study to replace the traditional graphite flow field plate. Along with commercial catalyst coated membranes, single and multi-cell fuel cell stacks are assembled to investigate the effects of the reactant flow rate, operation temperature, and humidification temperature on the cell performance. Metals have good electrical conductance and mechanical strength, which are suitable for bipolar plates in fuel cell stacks. Previous studies have shown that fuel cells using metal foam to replace traditional flow channels can have very good performance. The purpose of this study is to study the operation performance and characteristic of the fuel cell stack. In addition, the long-term performance and AC impedance are also investigated in this study. The results show that the performance of the fuel cell stack is improved by increasing the air flow rate. If oxygen is used as the oxidant, the required flow rate is lower. In order to get better cell performance, suitable humidification in the reactant is required. For long-term operation, periodic purging in the cathode can reduce the polarization loss due to mass transfer. Equivalent circuit model of the fuel cell stack system can be built from the AC impedance analysis. The results show that the main resistance in this system is mass transfer resistance.
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