- 學位論文
以鋁/碳纖維複合波浪板製造燃料電池雙極板的製程與其性質之研究
Study on the Manufacture Processes and Properties of Fuel Cell Bipolar-Plate Made of Aluminum/Carbon Fiber Corrugated Sheet
摘要
本研究將單向的碳纖維預浸布、未含浸編織碳纖編織布與石墨粉、膨脹石墨，再加上鋁箔進行交叉疊層後，再由熱壓成型製成波浪形雙極板。論文主要在探討碳纖維布編織的疏密程度、粉末種類及鋁箔片對導電複合板之機械、電導、氣密及熱傳導等性質的影響。實驗結果顯示：在雙極板表層及內部預浸碳纖布間添加膨脹石墨、石墨粉後的平面電導性能相較於未添加者大幅的提升，對其機械性質則無明顯的提升效果。加入3K及12K的碳纖編織布所製成的複合板，因表面的不平整影響了電性的量測效果，而在加入鋁箔片後對於熱傳導的效果有所提升，但電導性則下降。總結而言：在碳纖預浸材中加入不同粉末，可以有效的建立碳纖維與碳纖維間的導電通道，而對平面及穿透電導都有良好的提升效果。本研究之複合雙極板的電池（拉載）測試結果為：以層間加入石墨的碳纖預浸布波浪板為流道，與密度0.4g/cm3的膨脹石墨(含20％epoxy)結合所製成的複合雙極板，在電池電壓為0.28V時，有最大的電流密度1054.4mA/cm2 ; 電池電壓達0.48V時，有最大功率密度295.68mW/cm2。
並列摘要
PEMFC is a perfluorosulfonic acid type solid polymer electrolyte, a platinum / carbon electrocatalyst, Purifying recombinant or hydrogen gas as fuel, air or pure oxygen as the oxidant. Graphite or a metal plate surface modified with a gas flow channel as a bipolar plate, bipolar plate with the function of the reactive gas transport, both sides are machined or uniform distribution of the reaction gas flow field channels, In order to ensure uniform distribution of the reaction gas in the electrodes. In this research, the carbon fiber prepreg material, carbon fiber woven with graphite powder, graphite, aluminum foil laminated together with a mixture, by hot-press molding process. The purpose of this paper is to study the extent of the carbon fiber woven fabric density, powder type and aluminum foil on the mechanical and electrical properties of the expanded graphite bipolar plates. From the results, the addition of expanded graphite, graphite powder significantly improved plane conductivity than the original composite board, For the mechanical properties had no significant effect. Join the 3K、 12K carbon fiber woven to produce the composite panels, because of the uneven surface to produce the effect on the electrical properties, and after adding aluminum foil for improved heat conduction effect, but will let conductivity deteriorates. Based on the above results, to add a different powder in carbon fiber prepreg, have a conductive path is formed between carbon fibers, for plane conductivity, penetration resistance with good enhance results. The results reveal that the fuel cell with carbon fiber prepreg * 6 + graphite(20％epoxy) has the great current density of 1054 mA/cm2 occurs at 0.28 V, and the highest power density of 295.68 mW/cm2 occurs at 0.48 V.