Oboroceanu, D,Quill, N,Lenihan, C,Ni Eidhin, D,Albu, SP,Lynch, RP,Buckley, DN

2016

January

Journal Of The Electrochemical Society

Communication-Observation of Arrhenius Behavior of Catholyte Stability in Vanadium Flow Batteries

Published

()

IV-V-V ELECTRODE-KINETICS CELL ELECTROLYTE CARBON

163

2919

2921

The stability of typical vanadium flowbattery (VFB) catholytes with respect to precipitation of V2O5 was investigated at temperatures in the range 30-60 degrees C. In all cases a precipitate formed after an induction time, which decreased with increasing temperature and concentration of V-V and increased with concentration of sulfate. Arrhenius-type plots are shown for two typical solutions. These have excellent linearity and have similar slopes which yield an apparent activation energy of 1.79 eV (172 kJ mol(-1)). The variation of induction time with temperature for various concentrations of VV was simulated, and stability diagrams for additive-free VFB catholytes were generated. (C) The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. All rights reserved.

10.1149/2.0361614jes