Chemical durability of thin pore-filling membrane in open-circuit voltage hold test
Chemical durability of thin pore-filling membrane in open-circuit voltage hold test
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DOI：
10.1016/j.ijhydene.2019.09.143
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发表时间：
2019-11
影响因子：
7.2
通讯作者：
Yuhei Oshiba;Megumu Kosaka;Takeo Yamaguchi
中科院分区：
文献类型：
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作者：
Yuhei Oshiba;Megumu Kosaka;Takeo Yamaguchi
聚合物电解质燃料电池（PEFC）中质子交换膜的长期化学稳定性是广泛商业化的重要问题。在这里，我们使用开路电压保持测试报告了具有7 μm厚的填孔膜（填充有高离子交换容量全氟磺酸（PFSA）聚合物的多孔基底）的膜电极组件的化学稳定性。非常薄的填孔膜显示出与Nafion 211相当的化学耐久性。有趣的是，由于使用化学和机械稳定的多孔基材，填孔膜显示出与Nafion 211不同的降解行为，与Nafion 211中的膜变薄和大量氟泄漏相比，在填孔膜中没有观察到厚度变化和少量氟泄漏。薄的填孔膜显示出在PEFC中应用的前景，因为它平衡了高温和低相对湿度下的高燃料电池性能与高化学耐久性。
Long-term chemical stability of proton exchange membranes in polymer electrolyte fuel cells (PEFCs) is an important issue for widespread commercialization. Here, we report on the chemical stability of a membrane-electrode assembly with a 7 μm thick pore-filling membrane (porous substrate filled with high ion exchange capacity perfluorosulfonic acid (PFSA) polymer) using an open-circuit voltage hold test. The very thin pore-filling membrane shows comparable chemical durability to Nafion 211. Interestingly, the pore-filling membrane shows a different degradation behavior from Nafion 211 due to the use of chemically and mechanically stable porous substrate, with no thickness change and little amounts of fluorine leakages are observed in the pore-filling membrane compared to membrane thinning and large amounts of fluorine leakage in Nafion 211. The thin pore-filling membrane shows promise for application in PEFCs, as it balances high fuel cell performance at high temperature and low relative humidity with high chemical durability.