Backbone stability of quaternized polyaromatics for alkaline membrane fuel cells
Backbone stability of quaternized polyaromatics for alkaline membrane fuel cells
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DOI：
10.1016/j.memsci.2012.08.045
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发表时间：
2012-12-15
影响因子：
9.5
通讯作者：
Kim, Yu Seung
中科院分区：
文献类型：
--
作者：
Fujimoto, Cy;Kim, Dae-Sik;Kim, Yu Seung
在两种结构不同的聚合物体系中研究了苄基三甲基铵 (BTMA) 官能化聚芳烃的主链稳定性；季铵化聚亚芳基醚 (PAE) 和聚亚苯基 (PP)。 FTIR 分析表明，季铵化 PAE 中的芳基醚键在高 pH 环境下发生断裂，而季铵化 PP 中未观察到主链降解。 PAE 的主链降解不仅显着降低了膜的机械性能，而且还对氢氧化物电导率产生负面影响。使用 PAE 和 PP 膜的膜电极组件 (MEA) 显示出良好的初始碱性膜燃料电池性能。然而，仅 55 小时后，PAE MEA 就因机械损坏而表现出更大的性能损失和故障。 300小时后PP MEA没有发生灾难性的失效，这进一步证实了聚合物主链的稳定性。 (c) 2012 Elsevier B.V. 保留所有权利。
The backbone stability of benzyl-trimethyl ammonium (BTMA) functionalized polyaromatics was investigated in two structurally differing polymer architectures; quaternized poly(arylene ether) (PAE) and poly(phenylene) (PP). FTIR analysis indicated the cleavage of aryl-ether linkages in quaternized PAEs under high pH environments, while no backbone degradation in quaternized PP was observed. The backbone degradation of PAEs not only significantly reduced the mechanical properties of the membranes, but also negatively impacted hydroxide conductivity. Membrane electrode assemblies (MEAs) using both PAE and PP membranes showed good initial alkaline membrane fuel cell performance. However, the PAE MEA displayed larger performance losses and failure after only 55 h, due to a mechanical breach. No catastrophic failure of the PP MEA occurred after 300 h, which further confirmed the stability of the polymer backbone. (c) 2012 Elsevier B.V. All rights reserved.