PTFE/Nafion與Nafion質子交換膜燃料電池膜電極組-老化測試與失效機制之研究

The accelerated degradation test evaluation and degradation mechanism study of the membrane electrode assemblies with PTFE/Nafion and Nafion membranes for proton exchange membrane fuel cell cell

饒庭竹(Ting-Chu Jao)

指導教授 ： 鐘國濱

元智大學/工程學院/機械工程學系/博士(2011年)

https://doi.org/10.6838/YZU.2011.00028

摘要

商購質子交換膜燃料電池膜電極組常以Nafion作為其膜材，而Gore所研發之PTFE/Nafion複合膜具有較低成本、高機械強度、高尺寸安定性與耐高溫等特性，本研究主以自製PTFE/Nafion複合膜進行膜電極組之製備、分析與特性分析，並利用加速老化測試與即時的電化學分析方法進行老化研究。
　　本研究主以噴塗法製作catalyst coated membrane（CCM），輔以滴塗法（ink drop coating）進行製備方法之探討，揭露製備方法對CCM性能之影響；於操作參數中發現PTFE/Nafion複合膜特有的膜材濕潤程度對氫氣穿透量的影響，進而影響開路電壓結果，並提出其機制；加速老化測試中更是發現了PTFE/Nafion複合膜特有之內阻增加現象，輔以Nafion之CCM驗證其特殊性，並提出內阻增加之機制。

關鍵字

質子交換膜燃料電池 ； Nafion ； PTFE/Nafion複合膜 ； 加速老化 ； 老化機制

並列摘要

Nafion was used in the commercial membrane electrode assemblies (MEAs) for proton exchange fuel cells (PEMFCs). Gore invented the PTFE/Nafion composition membrane. The PTFE/Nafion composition membrane has the advantages of low cost, high mechanical strength, low swelling and high durability in high temperature. This study fabricated the PTFE/Nafion MEA from the composition of the PTFE/Nafion membrane. The character of PTFE/Nafion MEA and the accelerated degradation test were analyzed using in-situ electrochemical methods.
　　This study used spray coating and ink drop coating to compare the effect of different fabrication methods on MEAs. During the test of operation parameters, the water content of the membrane was found to affect the hydrogen crossover and consequently affect the open circuit voltage of PTFE/Nafion MEA. This study proposed the mechanism of unique character for PTFE/Nafion MEA. Experiments were conducted on the Nafion MEA and PTFE/Nafion MEA using the accelerated degradation test (ADT). Only the PTFE/Nafion MEA showed increased internal resistance under ADT.

並列關鍵字

degradation mechanisms ； PEMFC ； Nafion ； PTFE/Nafion composite membrane ； accelerated degradation test

參考文獻

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