Nuclear magnetic resonance studies on vanadium(IV) electrolyte solutions for vanadium redox flow battery

被引：100

作者：

Vijayakumar, M. ^{[1
]}

Burton, Sarah D. ^{[1
]}

Huang, Cheng ^{[1
]}

Li, Liyu ^{[1
]}

Yang, Zhenguo ^{[1
]}

Graff, Gordon L. ^{[1
]}

Liu, Jun ^{[1
]}

Hu, Jianzhi ^{[1
]}

Skyllas-Kazacos, Maria ^{[2
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Univ New S Wales, Sydney, NSW 2052, Australia

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 22期

关键词：

Vanadium redox flow battery; Vanadyl ion; Water exchange reaction; Molecular dynamics; O-17; NMR; HYPERFINE COUPLING-CONSTANTS; TRANSITION-METAL-COMPLEXES; NMR-RELAXATION; ABSORPTION-SPECTRA; EXCHANGE REACTIONS; SHIELDING TENSORS; AQUEOUS-SOLUTIONS; WATER-EXCHANGE; ION; ACID;

D O I：

10.1016/j.jpowsour.2010.05.008

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：

The vanadium(IV) electrolyte solutions with various vanadium concentrations are studied by variable temperature H-1 and O-17 nuclear magnetic resonance (NMR) spectroscopy. The structure and kinetics of vanadium(IV) species in the electrolyte solutions are explored with respect to vanadium concentration and temperature. It was found that the vanadium(IV) species exist as hydrated vanadyl ion, i.e. [VO(H2O)(5)](2+) forming an octahedral coordination with vanadyl oxygen in the axial position and the remaining positions occupied by water molecules. This hydrated vanadyl ion structure is stable in vanadium concentrations up to 3 M and in the temperature range of 240-340 K. The sulfate anions in the electrolyte solutions are found to be weekly bound to this hydrated vanadyl ion and occupies its second-coordination sphere. The possible effects of these sulfate anions in proton and water exchange between vanadyl ion and solvent molecules are discussed based on H-1 and O-17 NMR results. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：7709 / 7717

页数：9

共 48 条

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