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Measurements of VV Precipitation Times and Simulation of the Stability of Catholytes in Vanadium Flow Batteries

Published online by Cambridge University Press:  23 January 2017

Daniela Oboroceanu ,
Nathan Quill ,
Catherine Lenihan ,
Deirdre Ní Eidhin ,
Sergiu P. Albu ,
Robert P. Lynch  and
D. Noel Buckley
Daniela Oboroceanu
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
Nathan Quill
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
Catherine Lenihan
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
Deirdre Ní Eidhin
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
Sergiu P. Albu
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
Robert P. Lynch
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
D. Noel Buckley*
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland Department of Chemical Engineering, Case Western Reserve University, Cleveland OH, USA
*
*(Email: [email protected])
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Abstract

The stability of vanadium flow battery (VFB) catholytes was investigated using both lightscattering measurements and visual observation. V2O5 precipitates after an induction time τ which shows an Arrhenius variation with temperature. The value of τ increases with increasing concentration of sulfate and with decreasing concentration of VV but the activation energy remains constant with a value of (1.791±0.020) eV. Plots of ln τ against [S] and [VV] show good linearity and the slopes give values of βS = 2.073 M-1 and βV5 = –3.434 M-1 for the fractional rates of variation of τ with [S] and [VV], respectively. Combining the Arrhenius Equation with the observed log-linear variation of τ with [S] and [VV] provides a model for simulating the stability of catholytes.

Keywords

energy storageVkinetics
Type
Articles
Information
MRS Advances , Volume 2 , Issue 21-22: Energy and Sustainability , 2017 , pp. 1177 - 1182
Copyright
Copyright © Materials Research Society 2017 

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References

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