期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 27, 期 -, 页码 5-8出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.10.041
关键词
Fuel cell; PEM; Perfluorosulfonated ionomer; Interfacial water; Sum frequency generation spectroscopy
资金
- Japan Science and Technology Agency (JST) [23550033]
- PRESTO
- World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics
- program for Development of Environmental Technology using Nanotechnology from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- Grants-in-Aid for Scientific Research [23000009, 23550033] Funding Source: KAKEN
Humidity-dependent water structures at the interfaces between perfluorosulfonate ionomer (PFSI = Nafion) thin film and Pt and HOPG were determined at room temperature by using sum frequency generation (SFG) spectroscopy. At low relative humidity (RH) condition, a peak centered around 3600 cm(-1) corresponding to water molecules interacting with sulfonic acid group in proton channel at PFSI surface was observed at both interfaces. However, while this peak increased with RH at PFSI/Pt interface, that at PFSI/HOPG did not increase. These results suggest that the structure of water molecules, especially the water molecules at the proton channel of PFSI surface, is strongly affected by the interaction of PFSI with Pt and HOPG. (c) 2012 Elsevier B.V. All rights reserved.
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