Journal
JOURNAL OF POWER SOURCES
Volume 471, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228453
Keywords
Redox flow batteries; Electrochemistry; Stability; Ferrocyanide; Alkaline media
Funding
- Spanish Government (MINECO) through the Research Challenges Programme [RTI2018-099228-A-I00]
- Comunidad de Madrid through the Talent Attraction Programme [2017-T1/AMB-5190]
- Ministerio de Ciencia, Innovacion y Universidades [CTQ2017-87231-P, RYC-201722700]
- MINECO [CTQ2017-87231-P, RYC-201722700, RYC2018026086-I]
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In the quest for searching for new redox-flow battery chemistries, cycling stability must be carefully evaluated since it is one of the most important parameters of new active species. However, it is challenging to elucidate the intrinsic stability during operation of a redox flow battery. The symmetrical flow battery cell is a powerful tool that helps to unambiguously determine the cycling stability. Herein, trustworthiness of this technique is critically re-evaluated. Potassium ferrocyanide in alkaline media is used as a case study since i) it is the best performing species for the catholyte of alkaline flow batteries in terms of reversibility, solubility, costs and environmental compatibility and ii) the cycling stability of this species is still under strong debate. Potassium ferrocyanide is found to be stable at pH 14 upon electrochemical cycling when the oxygen evolution reaction is prevented, which should encourage researchers to resume the use of this species. The results also reveal that care should be taken when interpreting results from this powerful technique to avoid misleading conclusions.
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