Concentration Dependence of VO2+ Crossover of Nafion for Vanadium Redox Flow Batteries

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.004306jes· OSTI ID:1089794

Lawton, Jamie ^[1]; Jones, Amanda ^[1]; Zawodzinski, Thomas A ^[2]

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1. University of Tennessee, Knoxville (UTK)
2. ORNL

The VO2+ crossover, or permeability, through Nafion in a vanadium redox flow battery (VRFB) was monitored as a function of sulfuric acid concentration and VO2+ concentration. A vanadium rich solution was flowed on one side of the membrane through a flow field while symmetrically on the other side a blank or vanadium deficit solution was flowed. The blank solution was flowed through an electron paramagnetic resonance (EPR) cavity and the VO2+ concentration was determined from the intensity of the EPR signal. Concentration values were fit using a solution of Fick s law that allows for the effect of concentration change on the vanadium rich side. The fits resulted in permeability values of VO2+ ions across the membrane. Viscosity measurements of many VO2+ and H2SO4 solutions were made at 30 60 C. These viscosity values were then used to determine the effect of the viscosity of the flowing solution on the permeability of the ion. 2013 The Electrochemical Society. [DOI: 10.1149/2.004306jes] All rights reserved.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1089794
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 160; ISSN 0013-4651
• Country of Publication: United States
• Language: English