TY - GEN
T1 - Effect of additives on the kinetics of precipitation of Vv from catholytes in vanadium flow batteries
AU - Oboroceanu, Daniela
AU - Quill, Nathan
AU - Lenihan, Catherine
AU - Eidhin, Deirdre Ni
AU - Albu, Sergiu P.
AU - Lynch, Robert P.
AU - Buckley, D. Noel
N1 - Publisher Copyright:
© 2017 The Electrochemical Society.
PY - 2017
Y1 - 2017
N2 - The addition of H3PO4 has a strong stabilizing effect on vanadium flow battery (VFB) catholytes. For example, at 50°C the induction time for precipitation for atypical catholyte is enhanced -12.5-fold by 0.1 mol dm-3 added H3PO4. At concentrations of H3PO4 less than ∼0.3 M, the precipitation time increases with increasing concentration at all temperatures investigated (50-70°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 (> ∼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 ∼±15%). Experiments at 70°C using other phosphate additives (sodium triphosphate, Na5P3O10, and sodium hexametaphosphate, (NaPO3)6) showed similar results to H3PO4.
AB - The addition of H3PO4 has a strong stabilizing effect on vanadium flow battery (VFB) catholytes. For example, at 50°C the induction time for precipitation for atypical catholyte is enhanced -12.5-fold by 0.1 mol dm-3 added H3PO4. At concentrations of H3PO4 less than ∼0.3 M, the precipitation time increases with increasing concentration at all temperatures investigated (50-70°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 (> ∼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 ∼±15%). Experiments at 70°C using other phosphate additives (sodium triphosphate, Na5P3O10, and sodium hexametaphosphate, (NaPO3)6) showed similar results to H3PO4.
UR - http://www.scopus.com/inward/record.url?scp=85030471503&partnerID=8YFLogxK
U2 - 10.1149/07711.0107ecst
DO - 10.1149/07711.0107ecst
M3 - Conference contribution
AN - SCOPUS:85030471503
SN - 9781623324605
T3 - ECS Transactions
SP - 107
EP - 115
BT - Selected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PB - Electrochemical Society Inc.
T2 - 231st ECS Meeting
Y2 - 28 May 2017 through 1 June 2017
ER -