氣體擴散層PTFE濃度對PEM燃料電池最佳組裝壓力影響測試分析

Effects of PTFE contents in the gas diffusion layer and the optimum compression on the performance of a PEM fuel cell

顏政平(CHENG-PING YEN)

指導教授 ： 張敏興

大同大學/工程學院/機械工程學系所/碩士(2009年)

摘要

本篇論文之目的在探討質子交換膜燃料電池中的氣體擴散層(GDL)改變其PTFE濃度藉此來觀察燃料電池性能影響及不同壓力下燃料電池的性能改變。改變氣體擴散層(GDL)中的PTFE濃度，本篇論文選擇了四種不同的重量百分比濃度來觀察其中的變化，分別為PTFE 5 wt%、PTFE 10 wt%、PTFE 20 wt%及PTFE 30 wt%。在探討不同壓力下燃料電池的性能改變，本篇論文使用特別的燃料電池，能在前後兩邊的端板上施加壓力，並外接一個壓力顯示器，能即時顯示目前燃料電池承受多少的壓力。為了能更清楚的了解氣體擴散層中PTFE濃度改變會帶給燃料電池性能多大的影響及經過不同壓力下會帶給燃料電池怎樣的性能改變，除了量測燃料電池的性能曲線及交流阻抗頻譜之外，還量測了四點探針、接觸角測試、滲透率及掃描式電子顯微鏡(SEM)，藉由這些實驗來觀察氣體擴散層的PTFE濃度改變會帶給燃料電池怎樣的變化。

關鍵字

氣體擴散層 ； 燃料電池 ； PTFE

並列摘要

The aim of this thesis is to change PTFE contents in the gas diffusion layer (GDL) and change different pressure to study the optimum performance of a PEM fuel cell .Change different PTFE contents in the GDL are respectively PTFE 5 wt% , PTFE 10 wt% , PTFE 20 wt% , PTFE 30 wt% .This thesis uses in house fuel cell for measured fell cell, pressure resulting from torque on the bolts that clamp between the fuel cell and external a monitor to immediately waiting the pressure value on the fuel cell. In addition to I-V curve and electrochemical impedance spectroscopy (EIS), SEM , contact angle , four point probe and permeability are measured to clearer understand different PTFE contents in the GDL on the performance of the fuel cell.

並列關鍵字

gas diffusion layer ； fuel cell ； PTFE

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