Revisiting the cycling stability of ferrocyanide in alkaline media for redox flow batteries

JOURNAL OF POWER SOURCES

卷:471

Article

Paez, Teresa^1,2  Martinez-Cuezva, Alberto³  Palma, Jesus¹  Ventosa, Edgar^1,4,5 

[1] IMDEA Energy, Avda Ramon de La Sagra 3, E-28935 Madrid, Spain

[2] Univ Politecn Madrid, Dept Ingn Quim Ind & Medio Ambiente, Escuela Tecn Super Ingn Ind, C Jose Gutierrez Abascal 2, Madrid 28006, Spain

[3] Univ Murcia, Fac Quim, Dept Quim Organ, Reg Campus Int Excellence, Campus Mare Nostrum, E-30100 Murcia, Spain

[4] Univ Burgos, Dept Quim, Pza Misael Banuelos S-N, E-09001 Burgos, Spain

[5] Univ Burgos, Int Res Ctr Crit Raw Mat ICCRAM, Plaza Misael Banuelos S-N, E-09001 Burgos, Spain

关键词: Redox flow batteries;    Electrochemistry;    Stability;    Ferrocyanide;    Alkaline media;   

DOI  :  10.1016/j.jpowsour.2020.228453

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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