Effect of Additives on the Kinetics of Precipitation of V<SUP>V</SUP> from Catholytes in Vanadium Flow Batteries

Daniela Oboroceanu; Nathan Quill; Catherine Lenihan; Deirdre Ni Eidhin; Sergiu P. Albu; Robert P. Lynch; D. Noel Buckley

doi:10.1149/07711.0107ECST

Effect of Additives on the Kinetics of Precipitation of V<SUP>V</SUP> from Catholytes in Vanadium Flow Batteries

Daniela Oboroceanu, Nathan Quill, Catherine Lenihan, Deirdre Ni Eidhin, Sergiu P. Albu, Robert P. Lynch, D. Noel Buckley

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	Undefined/Unknown
Pages (from-to)	107-115
Number of pages	9
Journal	ECS Transactions
Issue number	11
DOIs	https://doi.org/10.1149/07711.0107ECST
Publication status	Published - 2017

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@article{cc72a3338e0243c08e117ba0b278e987,

title = "Effect of Additives on the Kinetics of Precipitation of VV from Catholytes in Vanadium Flow Batteries",

abstract = "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.",

author = "Daniela Oboroceanu and Nathan Quill and Catherine Lenihan and Eidhin, {Deirdre Ni} and Albu, {Sergiu P.} and Lynch, {Robert P.} and Buckley, {D. Noel}",

note = "Publisher Copyright: {\textcopyright} 2017 The Electrochemical Society.",

year = "2017",

doi = "10.1149/07711.0107ECST",

language = "Undefined/Unknown",

pages = "107--115",

journal = "ECS Transactions",

issn = "1938-5862",

number = "11",

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TY - JOUR

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

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 - https://publons.com/wos-op/publon/39561027/

U2 - 10.1149/07711.0107ECST

DO - 10.1149/07711.0107ECST

M3 - Article

SN - 1938-5862

SP - 107

EP - 115

JO - ECS Transactions

JF - ECS Transactions

IS - 11

ER -

Effect of Additives on the Kinetics of Precipitation of V<SUP>V</SUP> from Catholytes in Vanadium Flow Batteries

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