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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberSIID01
JournalJapanese journal of applied physics
Volume58
Issue numberSI
DOIs
Publication statusPublished - 2019
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'In-plane distribution of water inside Nafion<sup>®</sup> thin film analyzed by neutron reflectivity at temperature of 80 °c and relative humidity of 30%-80% based on 4-layered structural model'. Together they form a unique fingerprint.

Cite this