- 學位論文
質子交換膜燃料電池膨脹石墨/粉末狀環氧樹脂雙極板製程與性質之研究
Study on the Manufacture Process and Property of Expandable Graphite/Powder Epoxy Bipolar Plate for PEMFC
摘要
本論文主要在探討膨脹石墨/粉末環氧樹脂燃料電池雙極板之製程及其性質之研究。首先以粉末狀之熱固性環氧樹脂為黏結劑，加入膨脹石墨中，均勻混合後預壓成厚度為5mm的平板，再熱壓成型製成厚度為2mm的導電複合板。研究樹脂含量、石墨複合板密度、成型溫度等對導電複合板之機械、電導、氣密及熱傳導等重要性質的影響。實驗結果顯示：環氧樹脂含量增加，則複合板導電度下降；且其抗拉強度隨著環氧樹脂添加量增加而上升；膨脹石墨複合板的導電度、抗拉強度亦隨著複合板的密度增加而增加；成型溫度上升抗拉強度也隨之增加。接著，以適當製程將最佳組份之膨脹石墨複合板製成燃料電池雙極板。 第二階段以最佳條件製成雙極板組裝燃料電池，並測量其IV曲線與IP曲線。 其單電池性最大電流密度為2240 mA/cm2功率密度為872.4 mW/cm。
並列摘要
The development of manufacture process as well as the properties of the bipolar plates of a fuel cell was studied in this thesis. These bipolar plates are made of the mixture of expandable graphite and epoxy powder. After being uniformly mixed, the blend of graphite and epoxy powder was pre-pressed into a 5mm-thick flat panel, and then was pressed into 2mm-thick conductive compos-ite panels by thermoforming. The resin content, panel density and molding tem-perature were chosen to be the study factors which were the significant affects on the properties of the composite panel. The experimental results show that the increase of the content ratio of epoxy will result in the conductivity drop of the composite panel, but it will raise the tensile strength. The increasing of the composite panel density will raise the conductivity and tensile strength of the composite panel. And the tendency of modeling temperature to tensile strength of the composite panel is the same as panel density to tensile strength of the composite panel. Finally, an advisable ratio content and the corresponding man-ufacture process were utilized to mold bipolar plates and to fabricate a single fuel cell, and then the I-V curves and I-P curves of the single fuel cell were completed. The results reveal that the great current density of 2240.4mA/cm2 occurs at 0.272V, and the highest power density of 886.8mW/cm2 occurs at 0.481 V at the operating temperature of 70℃in the cell.
參考文獻
延伸閱讀
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