Overcoming Voltage Losses in Vanadium Redox Flow Batteries Using WO3 as a Positive Electrode

Seyedabolfazl Mousavihashemi, Sebastián Murcia-López, Miguel A. Rodriguez-Olguin, Han Gardeniers, Teresa Andreu, Juan Ramon Morante, Arturo Susarrey Arce, Cristina Flox

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Vanadium redox flow batteries (VRFBs) are appealing large-scale energy storage systems due to their unique properties of independent energy/power design. The VRFBs stack design is crucial for technology deployment in power applications. Besides the design, the stack suffers from high voltage losses caused by the electrodes. The introduction of active sites into the electrode to facilitate the reaction kinetic is crucial in boosting the power rate of the VRFBs. Here, an O-rich layer has been applied onto structured graphite felt (GF) by depositing WO3 to increase the oxygen species content. The oxygen species are the active site during the positive reaction (VO2+/VO2+) in VRFB. The increased electrocatalytic activity is demonstrated by the monoclinic (m)-WO3/GF electrode that minimizes the voltage losses, yielding excellent performance results in terms of power density output and limiting current density (556 mWcm−2@800 mAcm−2). The results confirm that the m-WO3/GF electrode is a promising electrode for high-power in VRFBs, overcoming the performance-limiting issues in a positive half-reaction.

Original languageEnglish
Article numbere202201106
JournalChemCatChem
Volume14
Issue number23
DOIs
Publication statusPublished - 7 Dec 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Positive Electrode
  • Pulsed Laser Deposition
  • Vanadium Redox Flow Batteries
  • Voltage losses
  • WO

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