Effect of additives on the kinetics of precipitation of Vv from catholytes in vanadium flow batteries

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-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 languageEnglish
Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PublisherElectrochemical Society Inc.
Pages107-115
Number of pages9
Edition11
ISBN (Electronic)9781607688174
ISBN (Print)9781623324605
DOIs
Publication statusPublished - 2017
Event231st ECS Meeting - New Orleans, United States
Duration: 28 May 20171 Jun 2017

Publication series

NameECS Transactions
Number11
Volume77
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference231st ECS Meeting
Country/TerritoryUnited States
CityNew Orleans
Period28/05/171/06/17

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