Journal
JOURNAL OF POWER SOURCES
Volume 331, Issue -, Pages 544-552Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.09.088
Keywords
NMR; Nafion; Vanadium; Flow battery
Funding
- PSC-CUNY from The City University of New York [44]
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We performed an extensive study on Nafion 117 membrane imbibed with various concentrations of aqueous ammonium metavanadate (NH4VO3), and vanadyl sulfate (VOSO4), in 2 M NH4VO3 over the temperature range of 20-100 degrees C, using H-1 NMR and AC Impedance spectroscopies. The objective was to determine the effect of the tetravalent (VO2+) and pentavalent (VO2+) vanadium ions on the proton transport of Nafion 117.H-1 NMR chemical shift and linewidth data show greater short-range proton transport for the VO2+ imbibed membranes compared with the VO2+. However, the local environments seem to differ in that while the data for VO2+ imbibed membranes seem to follow more the trends observed for water hydrated Nafion 117, those for the VO2+ followed the trend of its aqueous bulk vanadium solvents, indicating that viscosity plays a larger role for the VO2+ imbibed membranes compared to the VO2+. (C) 2016 Elsevier B.V. All rights reserved.
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