燃料電池之性能衰退研究

Study on Performance Degradation of High Temperature PEM Fuel Cells with Different Bipolar Plates

梁家豪；陳震宇；楊添福；顏維謀

高溫質子交換膜燃料電池 ； 金屬雙極板 ； 性能衰退 ； 磷酸 ； 金屬氧化物 ； HT-PEMFC ； Metallic bipolar plate ； Performance degradation ； Phosphoric acid ； Metallic oxide

冷凍空調&能源科技

107期（2018 / 01 / 10）

33 - 39

繁體中文;英文

本研究針對具不同雙極板高溫質子交換膜燃料電池進行性能老化測試，分別使用石墨、SS304不鏽鋼，以及鍍金SS304不鏽鋼等三種材料製成之雙極板進行燃料電池性能測試。主要的研究方法包含：極化曲線測試與電化學阻抗分析、循環伏安法量測、場發式電子顯微鏡、能量散佈分析儀等。在432小時的老化性能測試中，SS304不鏽鋼電池雙極板表面有明顯腐蝕，以及氧含量的增加，可說明雙極板表面氧化使得歐姆阻抗快速增大，導致性能衰減。而測試後使用能量散佈分析儀進行元素分析，在膜電極組的橫截面影像中，亦發現磷酸由PBI膜內析出，為導致歐姆阻抗上升之主要原因之一。

This research focuses on the performance degradation of the high temperature proton exchange membrane fuel cells (HT-PEMFCs) with metallic bipolar plates. In this work, the performance degradation of the HT-PEMFCs with graphite bipolar plates, SS304 bipolar plates, gold coated SS304 bipolar plates were studied via the polarization curve, the electrochemical impedance spectroscopy, the cyclic voltammetry, the scanning electron microscope and the energy dispersive X-ray spectrometry. The SEM and EDS results reveal that significant oxidation and corrosion reactions occur on the surface of the SS304 bipolar plate after 432 hours operation. In addition, the concentrations of O and P on the SS304 surface increase obviously after 432 hours operation. The above two phenomena show that ferric oxide and iron phosphate are formed on the SS304 surface and leads to an increase in the ohmic resistance of the HT-PEMFC with SS304 metallic bipolar plates.

1. Hu, J.(2006).Performance degradation studies on PBI/H3PO4 high temperature PEMFC and one-dimensional numerical analysis.Electrochimica acta,52,394-401.
2. Modestov, A.D.(2009).Degradation of high temperature MEA with PBI-H3PO4 membrane in a life test.Electrochimica Acta,54,7121-7127.
3. Oono, Y.(2010).Influence of operating temperature on cell performance and endurance of high temperature proton exchange membrane fuel cells.Journal of Power Sources,195,1007-1014.
4. Qi, Z.,Buelte, S.(2006).Effect of open circuit voltage on performance and degradation of high temperature PBI-H3PO4 fuel cells.Journal of Power Sources,161,1126-1132.