MEA氣體擴散層設計應用於高濃度甲醇燃料電池

Modification of gas diffusion layer for high concentration methanol fuel cell

張必承(Bi-Cheng Chang)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2009年)

摘要

本文探討陽極氣體擴散層物理特性(厚度、電阻、親疏水性、氣體滲透率)與膜電極組承受高濃度甲醇的相關性，藉由陽極氣體擴散層處理之設計來阻擋甲醇穿透，進一步使電池能操作於高濃度甲醇，提高電池的能量密度與效率。
Case-5 (階梯型微孔層-Gradient micro layer)膜電極組在2M甲醇濃度下最大功率密度為96.4mW/cm-2高於case-2膜電極組(商購穩定熱壓條件)，在8M甲醇濃度下甚至高於case-1膜電極組(商購已熱壓)。利用即時氣體分析儀(RTGA)分析時，發現在8M濃度下偵測到二氧化碳強度比case-1膜電極組小，推估甲醇穿透較少。

關鍵字

直接甲醇燃料電池 ； 氣體擴散層 ； 階梯型微孔層

並列摘要

This paper investigated physical properties of anode gas diffusion layer (thickness, resistance, contact angle, gas permeability) and the membrane electrode assemblies to bear the high concentration of methanol through the anode gas diffusion layer designed to block methanol to crossover.
The maximum power density of case-5 (gradient micro layer) MEA at 2M methanol concentration is 96.4mW/cm-2.It is better than case-2 MEA commercial MEA at stable hot-pressing conditions). The performance of case at a 8M methanol feed was even better than that the case-1 MEA(hot pressed commercial MEA).

並列關鍵字

DMFC ； Gas diffusion layer ； Gradient micro layer

參考文獻

17.江和興，「直接甲醇燃料電池陰極微孔層對性能的影響」，清華大學機械所，碩士論文，（2006）

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