Conference Publication Details
Mandatory Fields
Oboroceanu, D;Quill, N;Lenihan, C;Eidhin, DN;Albu, SP;Lynch, RP;Buckley, DN
SELECTED PROCEEDINGS FROM THE 231ST ECS MEETING
Effect of Additives on the Kinetics of Precipitation of V-V from Catholytes in Vanadium Flow Batteries
2017
January
Published
1
5 ()
Optional Fields
ELECTRODE-KINETICS CELL ELECTROLYTE ENERGY-STORAGE REDOX BATTERY STABILITY CARBON CHARGE STATE PRETREATMENT EFFICIENCY
107
115
The addition of H3PO4 has a strong stabilizing effect on vanadium flow battery (VFB) catholytes. For example, at 50 degrees C the induction time for precipitation for a typical catholyte is enhanced similar to 12.5-fold by 0.1 mol dm(-3) added H3PO4. At concentrations of H3PO4 less than similar to 0.3 M, the precipitation time increases with increasing concentration at all temperatures investigated (50-70 degrees C). The increase is approximately exponential at the lower end of the concentration range but, as the concentration is increased, the increase in induction time is less than exponential. At higher concentrations (> similar to 0.3 mol dm(-3)), induction time begins to decrease with increasing concentration of H3PO4. Arrhenius plots for concentrations of additive in the range 0-0.25 mol dm(-3) show reasonable fits to straight lines and the slopes are relatively constant (within similar to +/- 15%). Experiments at 70 degrees C using other phosphate additives (sodium triphosphate, Na5P3O10, and sodium hexametaphosphate, (NaPO3)(6)) showed similar results to H3PO4.
10.1149/07711.0107ecst
Grant Details