- 學位論文
金屬陰極流道板之圓角半徑設計對燃料電池性能之影響研究
The design and fabrication of metallic cathode fillet radii on the performance of PEMFC
摘要
質子交換膜燃料電池 (PEMFC) 組裝為影響性能的關鍵因子之一，壓縮力的增加可降低接觸電阻，但過度壓縮可能會導致額外的接觸電阻和對 MEA 結構的損壞。本研究提出了一種透過不同圓角半徑之陰極金屬流道板來提高電堆性能的模式並進行膜電極組件 (MEA) 中壓縮、變形和接觸面積的影響研究。研究結果顯示，適當的圓角半徑將可降低 54% 接觸電阻並避免壓縮積聚，從而將接觸電阻保持在適當的水平，由於金屬雙極板於電化學反應過程中易導致腐蝕現象，導致介面阻抗的增加，亦是燃料電池性能之關鍵因素之一，選擇不易腐蝕又能夠具備低阻抗之金屬便是重要的考量，故亦對未來適合大量生產之金屬材料不鏽鋼S316L及不同導電性佳之金屬基材進行其阻抗與模擬質子交換膜(PEM)燃料電池之腐蝕電流特性進行實際量測分析，利用實驗量測與觀察金屬基材的外觀及其阻抗性能，找出金屬於耐腐蝕能力與性能之間的關係進行探討以取得未來應用上之參考，以此來提供未來使用不鏽鋼金屬製作具有特徵圓角設計之陰極金屬雙極板之研究參考並期能加速燃料電池產業發展。
並列摘要
The assembly of PEM fuel cell (PEMFC) dominates a critical factor about the performance. A higher compression force can decrease a contact resistance but excessive compression may cause an abnormal contact resistance and damage the MEA structure. This research proposes a novel metal channel in which the cathode metal bipolar plate with fillet radius is used to improve the performance of the FC stack, including a comprehensive investigation about the effects of compression, deformation and contact area in the membrane electrode assembly (MEA). The research results show that a proper fillet radius can reduce by 54% of the contact resistance and avoid compression stress accumulation to consist with a lower deviation of the contact resistance. In addition, the metal stainless steel S316L, which is suitable for mass production, is used to suppress the corrosion of metal bipolar plate of fuel cell caused by the reaction in fuel cell flow channel. The higher interface impedance with bipolar plate induced by corrosion during chemical reaction can influence the performance of fuel cell significantly. It is critical for fuel-cell performance to choose corrosion-resistant metal with low impedance to attain effective contact with MEA with lower the contact-induced impedance. By using electrochemical-experiment analysis and measurement, the fuel cell performance and its structural features can be learned. The measurement and analysis of the impedance of metallic materials with different conductivities have been studied by the corrosive electric current of PEM fuel cell, by observing the appearance of metallic material and measuring its impedance through the experience. Thereby, the metal corrosion-resistance ability cab be related to the fuel cell performance. The analysis of the cathode metal bipolar plate with fillet radius is used to contribute the performance of fuel cell as a novel stack design.