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H-1 nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion
- Issue Date
- 12-1월-2015
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.106, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 106
- Number
- 2
- ISSN
- 0003-6951
- Abstract
- We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution H-1 nuclear magnetic resonance (NMR) measurements. "Bound" and "free" states of hydrated water clusters as well as the exchange protons were identified from the NMR chemical shift measurements, and their activation energies were obtained from the temperature-dependent laboratory-and rotating-frame spin-lattice relaxation measurements. Besides, a peculiar motional transition in the ultralow frequency region was observed at 373K for the "free" hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements. (C) 2015 AIP Publishing LLC.
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