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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents
Authors: Küttinger, Michael
Brunetaud, Ruben
Włodarczyk, Jakub K.
Fischer, Peter
Tübke, Jens
et. al: No
DOI: 10.1016/j.jpowsour.2021.229820
Published in: Journal of Power Sources
Volume(Issue): 495
Issue: 229820
Issue Date: 2021
Publisher / Ed. Institution: Elsevier
ISSN: 0378-7753
Language: English
Subjects: Stationary energy storage; Redox flow battery; Bromine; Safety; Bromine complexation; Cell performance
Subject (DDC): 621.3: Electrical, communications, control engineering
Abstract: Bromine complexing agents (BCA) are used to improve the safety of aqueous bromine electrolytes versus bromine outgassing in bromine electrolytes. In this work, cycling performance of hydrogen-bromine redox flow battery cells with 1-ethylpyridin-1-ium bromide ([C2Py]Br) as BCA in a bromine electrolyte with a theoretical capacity of 179.6 A h L−1 is investigated for the first time. The BCA leads to increased ohmic overvoltages. One cause of the ohmic drop can be attributed to [C2Py]+ cation interaction with the perfluorosulfonic acid (PFSA) membrane, which results in a drop of its conductivity. The BCA also interacts with bromine in the cell, by forming a non-aqueous fused salt second phase which exhibits a ten times lower conductivity compared to the aqueous electrolyte. A steep rise in cell voltage at the beginning of the charge curve followed by a regeneration of the cell voltage is attributed to this effect. Electrolyte crossover leads to an accumulation of [C2Py]+ in the electrolyte solution and intensifies both adverse processes. Under this condition only 30% of the theoretical electrolyte capacity of 179.6 A h L−1 is available under long term cycle conditions. However, electrolyte capacity is high enough to compete with other flow battery technologies.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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