In-plane distribution of water inside Nafion® thin film analyzed by neutron reflectivity at temperature of 80 °c and relative humidity of 30%-80% based on 4-layered structural model

Teppei Kawamoto, Makoto Aoki, Taro Kimura, Takako Mizusawa, Norifumi L. Yamada, Junpei Miyake, Kenji Miyatake, Junji Inukai*

*この研究の対応する著者

研究成果: Article査読

10 被引用数 (Scopus)

抄録

Structures of polymer electrolyte membranes and binders and the distribution of water inside are important for designing new ion-conductive ionomers for polymer electrolyte fuel cells. Neutron reflectometry (NR) was carried out on a Nafion® film with a thickness of 100 nm formed on native SiO2 surface on Si(100) for understanding the in-plane water distribution. The temperature was set at 80 °C and the relative humidity at 30, 50, 65, and 80% for NR measurements, simulating the conditions for the power generation. Clear NR modulation was obtained under each condition. NR data were fit very well with a 4-layer model parallel to the substrate with different densities of Nafion and water. At the interface between the Nafion film and the Si substrate, a 1 nm water-rich layer was observed under all conditions. The water concentration increased with humidity at all 4 layers, but the thickness increased mainly at the bulk layer.

本文言語English
論文番号SIID01
ジャーナルJapanese journal of applied physics
58
SI
DOI
出版ステータスPublished - 2019
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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