2026-07-11T11:12:21Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/58242022-09-29T22:42:07Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

00925njm 22002777a 4500 dc Páez, Teresa author Martínez Cuezva, Alberto author Palma, Jesús author Ventosa Arbaizar, Edgar author 2020-09 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. 0378-7753 http://hdl.handle.net/10259/5824 10.1016/j.jpowsour.2020.228453 Redox flow batteries Electrochemistry Stability Ferrocyanide Alkaline media Revisiting the cycling stability of ferrocyanide in alkaline media for redox flow batteries