本研究主要是從燃料與氧化劑供輸，比較非均質碳纖維雙極板與石墨雙極板應用在燃料電池的特性研究。在不同的進氣壓力與結合壓力的操作條件下，探討燃料流體進入碳纖維雙極板與石墨雙極板下方電極碳布之透氣性，最後經由電池之輸出電壓與功率來驗證新板的優越性。從實驗結果發現，碳纖維雙極束在低結合壓力下2 bar即有很高的燃料透氣性，大約是為石墨雙極板的4倍，燃料氣體不僅從可以側邊進入碳布還可以從穿透碳纖維雙極束由上方進入電極碳布，並且只受結合壓力輕微的影響。而且碳纖維雙極板在2 bar結合壓力下已足夠讓電極與碳布緊密接觸，可有效降低接觸電阻至18.5mΩ*cm²，因此使用新板，電池在結合壓力2bar陽極燃料進氣壓力1.15 bar(絕對壓力)下，功率已可達180 mW/cm2；在石墨雙極板方面，當結合壓力從1bar增加到4bar時，由於接觸電阻降低(38mΩ*cm²)很多但孔隙率降低較少，故增加輸出電壓與功率(最高113mW/cm2)，但再增加結合壓力時，接觸電阻的降低減小，遠小於電極碳布的孔隙率降低的影響，故輸出功率反而減小。在電流密度0.5 A/cm2時，碳纖維雙極板輸出電壓0.38V遠大於石墨雙極板輸出電壓0.2V 。

Via the viewpoint of fuel and oxidant supply in this study, we compare heterogeneous carbon fiber bipolar plates with graphite bipolar plates that apply to fuel cell. In operating condition with different gas inlet pressure and compressing pressure, we study the penetrability of reactant gases that come into the carbon cloth under the rib of a bipolar plate. Eventually the output voltage and power density are measured to prove the advantages of the new bipolar plate.
The experimental results show that carbon fiber bipolar bunch in low compressing pressure 2bar already display high gas penetrability. Its dimensionless flow rate is about quadruple of graphite bipolar plates. The reactant gas can enter the carbon cloth either from the side or from the top of the penetrating carbon fiber bipolar bunch. In addition, carbon fiber bipolar plates are affected slightly by compressing pressure. Further, the total electrical resistant of carbon fiber bipolar plates with carbon cloth already decreases to 18.5mΩ*cm² in low compressing pressure 2bar. Therefore, by appling the new bipolar plate, the fuel cell in compressing pressure 2bar and inlet fuel pressure 1.15bar(absolute pressure) can developed a power rate 180mW/cm². Concerning graphite bipolar plates, we can find that compressing pressure increase from 1bar to 4bar due to the reduction in total resistance so the output voltage and power density can increase to maximum value 113mW/cm2. However, while we augment more compressing pressure, the influence in reducing total resistance is much smaller than that in reducing the porosity of carbon cloth. Therefore, the output power density decreases. Also, output voltage of carbon fiber bipolar plates at 0.5mA/cm2 is 0.38 V and is higher than that of graphite bipolar plate 0.2 V.

目錄
目錄……………………………………………………….………….…...I
圖目錄……………………………………………………….………..….IV
論文摘要(中文)…………………………………………….….…..…..VI
論文摘要(英文)………………………………………………..……….VII
第一章 緒論……………………...………………….…………….1
1.1前言……………………………………………………….1
1.2 燃料電池之種類……………………………………………….3
1.3文獻回顧…………………………………………………….5
1.4研究目的……………………………………………………10
第二章 質子交換膜燃料電池工作原理與架構…….…..…....11
2.1燃料電池的工作原理………………………..……………...11
2.1.1反應效率…………………………………………………12
2.1.2電池理論燃料消耗量……………………………………13
2.1.3燃料氣體流量之無因次分析……………………………14
2.2質子交換膜燃料電池架構………………………………….15
2.2.1質子交換膜……………………………………………15
2.2.2電極……………………...…………………………….16
2.2.3催化劑………….…..………………………………….17
第三章 現行之雙極板製作........………………….………….….18
3.1雙極板之介紹..……....…………………………………..….18
3.1.1石墨材質雙極板…………………..……………………. 18
3.1.2金屬材質雙極板………………………………………... 19
3.1.3碳複合型雙極板……………………………………...… 20
3.2 非均質碳纖維雙極板……………………..……….....………20
3.2.1非均質碳纖維雙極板優點………………………………21
3.3雙極板之製作…….…………………………………………..22
3.3.1非均質碳纖維雙極板之製作…………………………..23
3.3.2 石墨材質雙極板之製作……………………………....25
第四章 量測系統…….……..………………….…..……………....26
4.1 碳纖維雙極板接觸電阻量測系統………………….…….…...26
4.2 碳纖維雙極板對碳布穿透氣性流量與壓力降量測系統….....27
4.3 質子交換膜燃料電池組性能量測系統…………………….…28
第五章 實驗結果與討論.....................................................……...31
5.1接觸電阻的分析..................................................………...........31
5.2 燃料對碳布透氣性的分析...................................………...32
5.2.1 燃料在不同雙極板之透氣性比較.………….....……....33
5.2.2 燃料在不同雙極板之透氣分佈曲線比較…...…...…....34
5.3壓力降的分析..................…...............................………...........35
5.4燃料進氣壓力的影響....…….…....……............……….…........36
5.4.1 燃料進氣壓力對碳纖維雙極板的影響.…………….....37
5.4.2 燃料進氣壓力對石墨雙極板的影響......……….......….37
5.5 不同石墨肋條寬度對輸出電壓的影響……...………….....….38
5.6結合壓力對輸出電壓的影響…...................………............39
第六章 結論與建議.............................................................…........41
6.1 結論………..……………………………….…………………..41
6.2 未來可進行的工作…................................……….........………43
參考文獻……………………………………………………………..…..44







圖目錄
圖2.1 質子交換膜燃料電池之工作原理示意圖…….………….…47
圖3.1 非均質碳纖維雙極板示意圖…………….…………….……47
圖 3.2 非均質碳纖維雙極板與電極碳布之接觸示………………...48
圖 3.3 傳統石墨雙極板與電極碳布之接觸示意…………..…...…48
圖3.4 碳纖維雙極板製作流程圖………….……………..……49
圖3.5 碳纖維雙極板量測流量模型照片…………………….……..50
圖3.6 石墨雙極板量測流量模型照片……………………….……..50
圖4.1 石墨雙極板與碳纖維雙極板之接觸電阻量測設備照….…..51
圖4.2 (a)石墨雙極板與(b)碳纖維雙極板電阻量測示意圖………..51圖4.3 流量量測之示意圖…………………………………….……..52圖4.4 測試系統照片………………...……………………………….52
圖4.5 石墨雙極板模型照片…………………………..……….……..53
圖 4.6 石墨雙極板模型之側視圖照片……….……………...…….. 53
圖5.1 不同結合壓力下，石墨雙極板與碳纖維雙極板總電阻之比較..................…...………………………………………………….…….54
圖5.2 不同的進氣壓力下，石墨雙極板中心位置無因次化流量對結合壓力之變化關係圖……..……………………………………..………54
圖5.3 不同的進氣壓力下，碳纖維雙極板中心位置無因次化流量對結合壓力之比較……….………………………………………...………55
圖5.4 進氣壓力1.15 bar下，石墨雙極板與碳纖維雙極板中心位置之無因次化流量對結合壓力之比較………….………...………………55
圖5.5 石墨雙極板在進氣壓力1.15bar及不同的結合壓力下，不同位置之無因次化流量之比較…………………………….………………...56
圖5.6 碳纖維雙極板在進氣壓力1.15bar及不同的結合壓力下，
不同位置之無因次化流量之比較………………………………………56
圖5.7 石墨雙極板與碳纖維雙極板壓力降對進氣壓力之比較……57
圖5.8 2bar的結合壓力下，碳纖維雙極板在不同的進氣壓力下，輸
出電壓對電流密度之比較..……..…………………………….…..….…57
圖5.9 不同進氣壓力下，石墨雙極板與碳纖維雙極板，在1.15 bar
進氣壓力下之輸出電壓與功率密度之比較……………………………58
圖5.10 MEA 4.5×50mm2下，不同導電肋條寬度大小對輸出功率的影
響…………………………………………………………………..…..…58
圖5.11 不同肋條寬度大小(MEA與肋條同)對輸出電壓的影響……59
圖5.12 不同的結合壓力下，石墨雙極板與碳纖維雙極板輸出電壓與電流密度之比較...…..…………………………………………………...59
圖5.13 在不同的結合壓力下，石墨雙極板與碳纖維雙極板功率密度對電流密度之比較……………………………………………………....60

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