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

来源：

SOLID STATE IONICS | 2012年 / 228卷

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

页码：46 / 55

页数：10

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