Towards understanding the poor thermal stability of V5+ electrolyte solution in Vanadium Redox Flow Batteries

被引：190

作者：

Vijayakumar, M. ^{[1
]}

Li, Liyu ^{[1
]}

Graff, Gordon ^{[1
]}

Liu, Jun ^{[1
]}

Zhang, Huamin ^{[2
]}

Yang, Zhenguo ^{[1
]}

Hu, Jian Zhi ^{[2
]}

机构：

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

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 07期

关键词：

O-17 and V-51 NMR; Vanadium Redox Flow Battery; Vanadium electrolytes; V2O5; precipitation; PRECIPITATION; PERFORMANCE; EQUILIBRIA;

D O I：

10.1016/j.jpowsour.2010.11.126

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 V5+ electrolyte solution from Vanadium Redox Flow Batteries was studied by variable temperature O-17 and V-51 Nuclear Magnetic Resonance (NMR) spectroscopy and density functional theory (DFT) based computational modeling. It was found that the V5+ species exist as hydrated penta co-ordinated vanadate ion, i.e. [VO2(H2O)(3)](1+). This hydrated structure is not stable at elevated temperature and change into neutral H3VO4 molecule via a deprotonation process and subsequently leading to the observed V2O5 precipitation in Vs electrolyte solutions. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：3669 / 3672

页数：4

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