微孔層PTFE與碳粉含量對高溫型PEM燃料電池性能影響測試分析

Effects of PTFE content and carbon loading in micro porous layer on the performance of a PBI-based high temperature PEM fuel cell

劉俊廷(chun ting liu)

指導教授 ： 張敏興

大同大學/工程學院/機械工程學系所/碩士(2010年)

摘要

本文研究目標為高溫質子交換膜燃料電池微孔層製作與特性研究，不同於一般市售膜電極組(MEA)，本研究自行組裝塗佈氣體擴散層上的微孔層及觸媒層，能更進一步探討膜電極組中微孔層成分與含量變化對燃料電池性能的影響，並且透過電化學阻抗頻譜法(EIS)分析電池內部各阻抗變化，及各項的物理性質測試包括氣體滲透率、表面阻抗、掃描式電子顯微鏡，來加以相互印證實驗結果。
本研究改變微孔層漿料塗佈量：碳粉荷載量0.5mg/cm2、1mg/cm2、1.5mg/cm2、2mg/cm2及微孔層漿料成分：PTFE 0%、PTFE 15%、PTFE 30%、PTFE 40%、PTFE 50%、PTFE 60%，進行實驗。實驗結果顯示，微孔層中碳粉的荷載量以1mg/cm2時，燃料電池的性能最好。而微孔層中PTFE含量的量測結果顯示，微孔層漿料中PTFE含量為40%時的電池性能最為優越，在交流阻抗頻譜與等效電路的模擬顯示其阻抗值最小，實驗結果也顯示當微孔層中碳粉荷載量及PTFE含量持續增加時，氣體滲透率將會減少，使得反應與生成氣體、水氣擴散不易，影響電池性能。

關鍵字

高溫型質子交換膜燃料電池 ； MEA 備製 ； 微孔層

並列摘要

The objectives of this study is that high-temperature proton exchange membrane fuel cell production and properties of micro porous layer. This study use self-assembly of coating micro porous layer and catalyst layer on the gas diffusion layer to replace commercial membrane electrode assembly (MEA). The further study is to find out that the influence due to micro porous layer composition and content of the fuel cell performance. To analysis of the fuel cell internal impedance by electrochemical impedance spectroscopy (EIS). The physical nature of the test: gas permeability, surface impedance, scanning electronic microscope to confirm each other results.
In this study, by changing the micro porous layer of slurry coating weight and components to experiment. Carbon loading capacity： 0.5mg/cm2, 1mg/cm2, 1.5mg/cm2, 2mg/cm2, and the slurry components： PTFE 0%, PTFE 10%, PTFE 20%, PTFE 30%, PTFE 40%, PTFE 50%.
The results show that the best performance of fuel cell with micro porous layer of loading capacity carbon is 1mg/cm2. The measurement results of PTFE content show that 30% PTFE content of the micro porous layer can make the most excellent fuel cell performance. The impedance spectrum and equivalent circuit simulation shows these two effects bring minimum of impedance value.
The experimental results also show that when we increasing the carbon loading capacity and PTFE content of micro porous layer the gas permeability will be reduced. Moreover, it will affect fuel cell performance by the decrease of water vapor diffusion rate and the gas from reaction and production.

並列關鍵字

high-temperature proton exchange membrane fuel c ； micro porous layer ； MEA preparation system

參考文獻

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