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
收藏
页码：3669 / 3672
页数：4
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