Communication—A new additive for increased stabilization of catholytes in vanadium flow batteries (VFBs)

Daniela Oboroceanu, Nathan Quill, Catherine Lenihan, Robert P. Lynch, D. Noel Buckley

Research output: Contribution to journalArticlepeer-review

Abstract

We report a new additive, monobasic potassium arsenate (KH2AsO4), for improving the thermal stability of VFB catholytes. Using our standard accelerated testing methodology at 30–70°C, we showed that the effect increases continuously with increasing concentration of arsenate over the range investigated (0 – 0.10 mol dm−3). In comparison to similar experiments with phosphate (H3PO4), the magnitude of the effect was greater for arsenate. A combination of arsenate and phosphate was also effective. Based on these results, we speculate that other Group-V elements in the +5 oxidation state may also stabilize VFB catholytes.

Original languageEnglish
Pages (from-to)A2270-A2272
JournalJournal of the Electrochemical Society
Volume166
Issue number10
DOIs
Publication statusPublished - 2019

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