吡啶-聚苯並咪唑合成及高溫質子交換膜燃料電池

Pyridine-poly(benzimidazole)s syntheses and high temperature PEMFC applications

廖奕翔(Yi-Hsiang Liao)

指導教授 ： 林秀麗

元智大學/工程學院/化學工程與材料科學學系/碩士(2012年)

摘要

本研究利用3,3-二胺基聯苯胺(DAB)，間苯二甲酸(IPA)及2,6-吡啶二甲酸(PyA)單體合成四批吡啶-聚苯並咪唑(Pyr-PBI)及一批聚苯並咪唑(PBI)。其中DAB/PyA/IPA之摩爾比分別為：DAB/PyA/IPA
=1/0.6/0.4 (Pyr-PBI-64)；DAB/PyA/IPA=1/0.5/0.5 (Pyr-PBI-55)；DAB/
PyA/IPA=1/0.4/0.6 (Pyr-PBI-46)；DAB/PyA/IPA=1/0.3/0.7 (Pyr-PBI-37)及 DAB/PyA/IPA=1/0/1 (PBI)。利用此五批高分子材料製作薄膜(厚度約50μm)浸漬磷酸製作膜電極組，並在160 ℃之溫度測試燃料電池性能。由於Pyr-PBI於重複單元中較PBI膜材多了氮元素，使其與磷酸分子間的作用力增強。薄膜浸漬後之磷酸含酸率測定顯示，Pyr-PBI膜之PyA/IPA單體莫爾比增加，磷酸含量增加。燃料電池單電池(陽極及陰極之Pt塗佈量均0.5 mg /cm2)測試顯示，Pyr-PBI-55、Pyr-PBI
-46、於0.6V電位的電流密度可分別達到379 mA /cm2及348 mA /cm2優於純PBI的272 mA / cm2

關鍵字

吡 ； 啶二甲酸 ； 聚苯並咪唑 ； 質子交換膜燃料電池

並列摘要

In this study, four Pyr-PBIs and a PBI polymer were synthesized from 3,3-diaminobenzidine (DAB),2,6-pyridinedicarboxylic acid (PyA), and isophthalic acid (IPA) monomers. The mole ratios of monomers fed into polymerizations were:DAB/PyA/IPA=1/0.6/0.4 (Pyr-PBI-64);DAB/
PyA/IPA=1/0.5/0.5 (Pyr-PBI-55);DAB/PyA/IPA=1/0.4/0.6(Pyr-PBI-46);
DAB/PyA/IPA=1/0.3/0.7 (Pyr-PBI-37);and DAB/PyA/IPA=1/0/1 (PBI).
The membrane electrode assemblies (MEAs) were then prepared from these five H3PO4 doped membranes with Pt-C (Pt content 40 wt% on carbon powder support) catalyst, in which the Pt loadings were both 0.5 mg /cm2 at anode and cathode, and carried out fuel cell tests. The results showed that Pyr-PBI-55 and Pyr-PBI-46 had better fuel cell performance than PBI. It was attributed to the presence of PyA monomer in the Pyr-PBI membranes resulting a higher H3PO4 doping level and thus a better fuel cell performance.

並列關鍵字

PBI ； PEMFC ； Pyr-PBI

參考文獻

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