Study of flow behavior in all-vanadium redox flow battery using spatially resolved voltage distribution

Arjun Bhattarai, Nyunt Wai, Rüdiger Schweiss, Adam Whitehead, Günther G. Scherer, Purna C. Ghimire, Tam D. Nguyen, Huey Hoon Hng

Research output: Contribution to journalArticleResearchpeer-review

19 Citations (Scopus)

Abstract

Uniform flow distribution through the porous electrodes in a flow battery cell is very important for reducing Ohmic and mass transport polarization. A segmented cell approach can be used to obtain in-situ information on flow behaviour, through the local voltage or current mapping. Lateral flow of current within the thick felts in the flow battery can hamper the interpretation of the data. In this study, a new method of segmenting a conventional flow cell is introduced, which for the first time, splits up both the porous felt as well as the current collector. This dual segmentation results in higher resolution and distinct separation of voltages between flow inlet to outlet. To study the flow behavior for an undivided felt, monitoring the OCV is found to be a reliable method, instead of voltage or current mapping during charging and discharging. Our approach to segmentation is simple and applicable to any size of the cell.

Original languageEnglish
Pages (from-to)443-452
Number of pages10
JournalJournal of Power Sources
Volume360
DOIs
Publication statusPublished - 31 Aug 2017
Externally publishedYes

Keywords

  • Flow distribution
  • Porous electrodes
  • Segmented cell
  • Vanadium redox flow battery

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