Thin pore-filling membrane with highly packed-acid structure for high temperature and low humidity operating polymer electrolyte fuel cells
Thin pore-filling membrane with highly packed-acid structure for high temperature and low humidity operating polymer electrolyte fuel cells
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DOI：
10.1016/j.jpowsour.2018.05.013
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发表时间：
2018-08
影响因子：
9.2
通讯作者：
Yuhei Oshiba;Jin Tomatsu;Takeo Yamaguchi
中科院分区：
文献类型：
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作者：
Yuhei Oshiba;Jin Tomatsu;Takeo Yamaguchi
对于下一代聚合物电解质燃料电池（PEFC），膜电极组件（MEA）应该能够在高温和低相对湿度（RH）下工作。在这样的条件下，由于质子交换膜（PEM）中的质子传导性的高电阻，电池性能急剧下降。因此，设计在高温和低RH下表现出高质子传导率的PEM是具有挑战性的。在这项研究中，我们提出了一种填孔膜，由低当量（EW）全氟磺酸（PFSA）聚合物和机械强度高的超薄超高分子量聚乙烯多孔基板。这种填孔膜抑制了低EW PFSA聚合物的溶胀，并表现出高质子传导性。在基底的孔内，实现了磺酸基团的高密度结构，这对于在低湿度条件下的高质子传导率是有利的。具有填孔膜的MEA在高温和低RH下显示出高的燃料电池性能;在100 °C和30%RH下的最大功率密度约为1000 mW cm− 2。虽然这种膜的厚度约为Nafion 211（7 μm）的四分之一，但由于有效的溶胀抑制，它们具有相当的氢交叉电流密度。
For the next generation polymer electrolyte fuel cells (PEFCs), membrane electrode assemblies (MEAs) should be able to operate at high temperatures and low relative humidity (RH). Under such conditions, cell performance drastically decreases owing to the high resistance of proton conductivity in the proton exchange membrane (PEM). It is thus challenging to design a PEM that exhibits high proton conductivity at high temperature and low RH. In this study we propose a pore-filling membrane, composed of a low equivalent weight (EW) perfluorosulfonic acid (PFSA) polymer and a mechanically strong thin ultra-high molecular weight polyethylene porous substrate. This pore-filling membrane suppresses the swelling of the low EW PFSA polymer and exhibits high proton conductivity. Inside the pores of the substrate, a high-density structure of sulfonic acid groups was achieved, which is advantageous for high proton conductivity at low humidity conditions. The MEA with the pore-filling membrane shows high fuel cell performance at high temperatures and low RH; the maximum power density was around 1000 mW cm−2at 100 °C and 30% RH. Although the thickness of this membrane was around one-fourth of that with Nafion 211 (7 μm), they have comparable hydrogen crossover current density owing to the effective swelling suppression.