TY - JOUR
T1 - 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
AU - Kawamoto, Teppei
AU - Aoki, Makoto
AU - Kimura, Taro
AU - Mizusawa, Takako
AU - Yamada, Norifumi L.
AU - Miyake, Junpei
AU - Miyatake, Kenji
AU - Inukai, Junji
N1 - Funding Information:
This work was performed under "Superlative, Stable, and Scalable Performance Fuel Cell" (SPer-FC) project of the New Energy and Industrial Technology Development Organization (NEDO). The NR experiments were performed as projects approved by the Japan Proton Accelerator Research Complex under user programs, Nos. 2016A0246, 2016B0036, and 2017B0316. J.I. thanks Drs. Hideto Imai, Masashi Matsumoto, Naoki Takao, and Yoshiki Iwai of Nissan ARC, Ltd for useful discussions and preliminary X-ray reflectivity measurements.
Publisher Copyright:
© 2019 The Japan Society of Applied Physics.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
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U2 - 10.7567/1347-4065/ab0c7c
DO - 10.7567/1347-4065/ab0c7c
M3 - Article
AN - SCOPUS:85072316425
SN - 0021-4922
VL - 58
JO - Japanese journal of applied physics
JF - Japanese journal of applied physics
IS - SI
M1 - SIID01
ER -