{sup 1}H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4905602· OSTI ID:22399124

Han, Jun Hee; Lee, Kyu Won; Jeon, G. W.; Park, W. K. ^[1]; Choi, E. H. ^[2]

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1. Global Education Center for Engineers, Seoul National University, Seoul 151-744 (Korea, Republic of)
2. Department of Electophysics, Kwangwoon University, Seoul 130-701 (Korea, Republic of)

We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution {sup 1}H 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 373 K for the “free” hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements.

• OSTI ID: 22399124
• Journal Information: Applied Physics Letters, Vol. 106, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CHEMICAL SHIFT
HYDROGEN 1
MEMBRANES
MOLECULES
NUCLEAR MAGNETIC RESONANCE
PROTONS
RESOLUTION
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TIME MEASUREMENT
WATER