Humidity dependent structure of water at the interfaces between perfluorosulfonated ionomer thin film and Pt and HOPG studied by sum frequency generation spectroscopy
| Autor: | Hideo Naohara, Kohei Uosaki, Hidenori Noguchi, Kento Taneda |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Materials science Analytical chemistry Sulfonic acid lcsh:Chemistry chemistry.chemical_compound chemistry lcsh:Industrial electrochemistry lcsh:QD1-999 Nafion Electrochemistry Molecule Relative humidity Thin film Spectroscopy Ionomer Sum frequency generation spectroscopy lcsh:TP250-261 |
| Zdroj: | Electrochemistry Communications, Vol 27, Iss, Pp 5-8 (2013) |
| ISSN: | 1388-2481 |
| Popis: | 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. Keywords: Fuel cell, PEM, Perfluorosulfonated ionomer, Interfacial water, Sum frequency generation spectroscopy |
| Databáze: | OpenAIRE |
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