Analysis of Ionomer Distribution in Catalyst Layers by Two-Stage Ion-Beam Processing
Analysis of Ionomer Distribution in Catalyst Layers by Two-Stage Ion-Beam Processing
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通过两级离子束处理分析催化剂层中的离聚物分布
DOI：
10.1149/08008.0419ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Tsushima
中科院分区：
文献类型：
--
作者：
T. Suzuki;T. Koyama;S. Tsushima
在催化剂层中的离子分布已经聚集了许多注意力来理解传输现象。在这项研究中，提出了一种新的可视化方法的整体通过平面的离聚物分布在催化剂层，通过使用两个阶段的离子束处理。第一阶段是通过宽离子束形成平坦和光滑的横截面。第二阶段是通过聚焦离子束选择性地去除催化剂层中的材料。在第一和第二阶段之后获得扫描离子显微镜图像。然后通过图像处理提取离聚体分布。分析了离聚物与碳之比为2.0的催化剂层的离聚物分布。离聚体分布不均匀。在与聚合物电解质膜的界面处形成薄的离聚物层。这可能是因为在制造过程中溶剂蒸发期间离聚物的沉积。
Ionomer distribution in catalyst layers has gathered much attention to understanding transport phenomena. In this study, a novel visualization method of the overall through-plane ionomer distribution in the catalyst layers by using a two-stage ion-beam processing is suggested. The first stage is the formation of flat and smooth cross-section by a broad ion beam. The second stage is the selective removal of the materials in the catalyst layer by a focused ion beam. Scanning ion microscopic images were obtained after the first and second stage. Then ionomer distribution was extracted by image processing. The ionomer distribution of the catalyst layer with ionomer to carbon ratio of 2.0 was analyzed. The throughplane ionomer distribution was inhomogeneous. Thin ionomer layer was formed at the interface with the polymer electrolyte membrane. This can be because of deposition of ionomer during solvent evaporation in the fabrication process.