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

被引：14
|
作者：
Han, Jun Hee [1 ]
Lee, Kyu Won [1 ]
Jeon, G. W. [1 ]
Lee, Cheol Eui [1 ]
Park, W. K. [2 ]
Choi, E. H. [3 ]
机构：
[1] Korea Univ, Dept Phys, Seoul 136713, South Korea
[2] Seoul Natl Univ, Global Educ Ctr Engineers, Seoul 151744, South Korea
[3] Kwangwoon Univ, Dept Electophys, Seoul 130701, South Korea
来源：
APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
PROTON TRANSPORT; NMR; MEMBRANES; CONDUCTIVITY; RELAXOMETRY; MOLECULE; MOTION; STATES;
D O I：
10.1063/1.4905602
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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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页数：3
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