Structure and Stability of Hexa-Aqua V(III) Cations in Vanadium Redox Flow Battery Electrolytes
The Vanadium (III) cation structure in mixed acid based electrolyte solution from vanadium redox flow batteries were studied by 17O and 35/37Cl Nuclear Magnetic Resonance (NMR) spectroscopy, electronic spectroscopy and density functional theory (DFT) based computational modeling. Both computational and experimental results reveals that the V(III) species can complex with counter anions (sulfate/chlorine) 10 depend on the composition of its solvation sphere. By analyzing the powder precipitate it was found that the formation of sulfate complexed V(III) species is the crucial process in the precipitation reaction. The precipitation occurs through nucleation of neutral species formed through deprotonation and ion-pair formation process. However, the powder precipitate shows a multiphase nature which warrants multiple reaction pathways for precipitation reaction.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1045108
- Report Number(s):
- PNNL-SA-86137; 44591; TRN: US201214%%936
- Journal Information:
- Physical Chemistry Chemical Physics, Vol. 14, Issue 29; ISSN 1463-9076
- Country of Publication:
- United States
- Language:
- English
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