2026-06-29T18:51:15Zhttps://riubu.ubu.es/oai/request

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

Revisiting the cycling stability of ferrocyanide in alkaline media for redox flow batteries Páez, Teresa Martínez Cuezva, Alberto Palma, Jesús Ventosa Arbaizar, Edgar Redox flow batteries Electrochemistry Stability Ferrocyanide Alkaline media 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. 2021-07-06T09:13:35Z 2021-07-06T09:13:35Z 2020-09 info:eu-repo/semantics/article 0378-7753 http://hdl.handle.net/10259/5824 10.1016/j.jpowsour.2020.228453 spa Journal of Power Sources. 2020, V. 471, 228453 https://doi.org/10.1016/j.jpowsour.2020.228453 info:eu-repo/grantAgreement/MINECO/RTI2018-099228-A-I00 info:eu-repo/grantAgreement/CM/2017-T1/AMB-5190 info:eu-repo/grantAgreement/MINECO/CTQ2017-87231-P info:eu-repo/grantAgreement/MINECO/RYC-2017-22700 info:eu-repo/grantAgreement/MINECO/RYC2018-026086-I http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier