直接甲醇燃料電池堆設計與性能分析

Performance analysis and Design of Direct Methanol Fuel Cell stacks

鍾振忠(Chen-chung Chung)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2004年)

摘要

直接甲醇燃料電池(Direct Methanol Fuel Cell)是PEMFC的一種，雖說直接甲醇燃料電池的性能效率不如PEMFC，但由於其燃料是將原本的氫氣用甲醇稀釋溶液來取代，使其燃料補充方式方便及安全性高，所以目前的應用發展皆在於攜帶式電源，而攜帶式電源可用於取代筆記型電腦、手機等的電源供應，此外也可用作單獨的攜帶式電源供應器。
燃料電池為了增加輸出電流或電壓，通常會利用多顆單電池之串�並聯設計為電池堆以達到欲使用電壓�電流之輸出。本論文以串聯多顆單電池期達到較高的電壓，以直接甲醇燃料電池為研究設計之對象，並在改變組裝技巧、燃料流量、甲醇水溶液溫度、電池堆溫度、甲醇水溶液濃度等條件下，分析以上參數對直接甲醇燃料電池堆的影響。
本論文設計了三顆電池堆，一為自然進氣平板式直接甲醇燃料電池堆；一為強制進氣平板式直接甲醇燃料電池堆；一為堆疊式直接甲醇燃料電池堆。實驗證明，此三顆電池堆設計皆能串聯電壓，而堆疊式直接甲醇燃料電池堆能得到最佳性能；自然進氣平板式直接甲醇燃料電池堆因為陰極端是吸附空氣中的氧氣，所以性能最差。

關鍵字

平板式 ； 直接甲醇燃料電池堆 ； 串聯電壓

並列摘要

Direct Methanol Fuel Cell is a kind of PEMFC. The performance effect of DMFC is not better than PEMFC; however, we use methanol-diluted solution as our fuel to replace hydrogen used before, which makes the supplying way of fuel more convenient and less dangerous; therefore, most development these days pays high attention to portable power system, which can not only take the place of that used in notebooks and cellular phones, but also be able to work well on individual power stations.
In order to heighten the current or voltage on output, PEMFC is usually made and designed into fuel cell stack with several single-cells connecting with each other in series or in parallel to reach the output we are longing for. In order to heighten the voltage, this thesis connects several single cells, and does analysis to the influence on DMFC STACK in parameters under not only different component techniques, fuel flow rate, methanol solution concentration, but also temperature of methanol solution and of the stack as well.
This thesis designs three fuel cell stacks: one is Naturally air-breathing planar direct methanol fuel cell stack; one is Forcedly feeding oxygen planar direct methanol fuel cell stack, and the other is direct methanol fuel cell stack. The experiment has proved that all of these three stacks can connect voltage in series, and the direct methanol fuel cell stack works best; on the other hand, the cathode of Naturally air-breathing direct methanol fuel cell stack, however, absorbs oxygen in the air, so it performs worst.

並列關鍵字

Planar ； Direct methanol fuel cell ； Connect voltage

參考文獻

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