Chemically modified proton‐conducting membranes based on sulfonated polyimides: Improved water stability and fuel‐cell performance
Chemically modified proton‐conducting membranes based on sulfonated polyimides: Improved water stability and fuel‐cell performance
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DOI：
10.1002/pola.21477
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发表时间：
2006-06
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影响因子：
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通讯作者：
Yan Yin;Otoo Yamada;S. Hayashi;Kazuhiro Tanaka;H. Kita;K. Okamoto
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作者：
Yan Yin;Otoo Yamada;S. Hayashi;Kazuhiro Tanaka;H. Kita;K. Okamoto
基于磺化聚酰亚胺（SPI）低聚物和三胺单体原位交联的新概念，制备了一系列支化/交联磺化聚酰亚胺（B/C-SPI）膜，并作为质子传导离聚物进行了评估。尽管具有高离子交换容量（2.2-2.6 mequiv g -1 ），但以 1,3,5-三（4-氨基苯氧基）苯作为交联剂的 SPI 低聚物中的化学支化和交联使聚合物膜在 130 °C 水中加速老化处理下具有非常好的水稳定性和机械性能。所得聚合物电解质在120℃水中表现出0.2-0.3 S cm -1 的高质子电导率，在50%相对湿度下表现出0.02-0.03 S cm -1 的相当高的电导率。在90°C的单个H 2 /O 2 燃料电池系统中，它们表现出与Nafion 112相当的高燃料电池性能。B/C-SPI膜在甲醇浓度高达50 wt%的直接甲醇燃料电池中也表现出良好的性能，优于Nafion 112。
A series of branched/crosslinked sulfonated polyimide (B/C-SPI) membranes were prepared and evaluated as proton-conducting ionomers based on the new concept of in situ crosslinking from sulfonated polyimide (SPI) oligomers and triamine monomers. Chemical branching and crosslinking in SPI oligomers with 1,3,5-tris(4-aminophenoxy)benzene as a crosslinker gave the polymer membranes very good water stability and mechanical properties under an accelerated aging treatment in water at 130 °C, despite their high ion-exchange capacity (2.2-2.6 mequiv g -1 ). The resulting polymer electrolytes displayed high proton conductivities of 0.2-0.3 S cm -1 at 120 °C in water and reasonably high conductivities of 0.02-0.03 S cm -1 at 50% relative humidity. In a single H 2 /O 2 fuel-cell system at 90 °C, they exhibited high fuel-cell performances comparable to those of Nafion 112. The B/C-SPI membranes also displayed good performances in a direct methanol fuel cell with methanol concentrations as high as 50 wt % that were superior to those of Nafion 112.