1H NMR study of the hydrogen dynamics in the (NaS)xGe(OH)4-x•yH2O ceramic proton conductors

被引:1
|
作者
Shastri, A. [1 ]
Shane, D. [2 ]
Nordstrom, J. [3 ]
Matic, A. [3 ]
Martin, S. W. [4 ]
机构
[1] Minnesota State Univ Moorhead, Dept Phys & Astron, Moorhead, MN 56563 USA
[2] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[3] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden
[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
关键词
Proton; Conductor; NMR; Water; Grotthuss; Dynamics; ALKALI THIO-HYDROXOGERMANATES; SPIN-LATTICE-RELAXATION; INFRARED-SPECTROSCOPY; NMR; CONDUCTIVITY; MOTION; FUEL;
D O I
10.1016/j.ssi.2012.09.017
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
H-1 NMR was performed on the ceramic proton conductor (NaS)(x)Ge(OH)(4-x)center dot yH(2)O for x = 2, 3 and y-1-4 over the temperature range of -100 degrees C to 400 degrees C. NMR spectra, nuclear spin-lattice relaxation rates (R-1), spin-spin relaxation rates (R-2), and rotating frame relaxation rates (R-1p) were obtained for both hydrated and dehydrated samples. It was found that the low temperature NMR spectra were consistent with simulated H2O lineshapes, and the presence of H3O+ at low temperature was not detected within the experimental uncertainty. Short- and long-range hydrogen motion occurred together, a signature of Grotthuss conduction mechanisms. The long range motion was a combination of H+ and H2O diffusion, with H2O motion limiting H+ dynamics as the onset temperature was approached. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:46 / 55
页数:10
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