Mochizuki Takashi, Uchida Makoto, Uchida Hiroyuki, Watanabe Masahiro, Miyatake Kenji
Interdisciplinary Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research Center, University of Yamanashi , 4 Takeda, Kofu, Yamanashi 400-8510, Japan.
ACS Appl Mater Interfaces. 2014 Aug 27;6(16):13894-9. doi: 10.1021/am503295y. Epub 2014 Jul 11.
A double-layer ionomer membrane, thin-layer Nafion (perfluorinated sulfonic acid polymer) on a sulfonated aromatic block copolymer (SPK-bl-1), was prepared for improving fuel cell performance. Each component of the double-layer membrane showed similar phase-separated morphologies to those of the original membranes. A fuel cell with the double-layer membrane exhibited lower ohmic resistance and higher cathode performance than those with the original SPK-bl-1 membrane despite their comparable water uptake and proton conductivity. Detailed electrochemical analyses of fuel cell data suggested that the thin Nafion interlayer contributed to improving the interfacial contact between the SPK-bl-1 membrane and the cathode catalyst layer and to mitigating excessive drying of the membrane. The results provide new insight on designing high-performance fuel cells with nonfluorinated ionomer membranes such as sulfonated aromatic polymers.
制备了一种双层离聚物膜，即在磺化芳族嵌段共聚物（SPK-bl-1）上的薄层Nafion（全氟磺酸聚合物），以提高燃料电池性能。双层膜的每个组分都呈现出与原始膜相似的相分离形态。尽管双层膜与原始SPK-bl-1膜的吸水率和质子传导率相当，但具有双层膜的燃料电池表现出比原始SPK-bl-1膜更低的欧姆电阻和更高的阴极性能。对燃料电池数据进行的详细电化学分析表明，薄的Nafion中间层有助于改善SPK-bl-1膜与阴极催化剂层之间的界面接触，并减轻膜的过度干燥。这些结果为设计具有非氟化离聚物膜（如磺化芳族聚合物）的高性能燃料电池提供了新的见解。
