Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents

Küttinger, Michael; Brunetaud, Ruben; Włodarczyk, Jakub K.; Fischer, Peter; Tübke, Jens

doi:10.1016/j.jpowsour.2021.229820

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-22253

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 10.21256/zhaw-22253
Published in:	Journal of Power Sources
Volume(Issue):	495
Issue:	229820
Issue Date:	2021
Publisher / Ed. Institution:	Elsevier
ISSN:	0378-7753 1873-2755
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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/22253
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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Küttinger, M., Brunetaud, R., Włodarczyk, J. K., Fischer, P., & Tübke, J. (2021). Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents. Journal of Power Sources, 495(229820). https://doi.org/10.1016/j.jpowsour.2021.229820

Küttinger, M. et al. (2021) ‘Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents’, Journal of Power Sources, 495(229820). Available at: https://doi.org/10.1016/j.jpowsour.2021.229820.

M. Küttinger, R. Brunetaud, J. K. Włodarczyk, P. Fischer, and J. Tübke, “Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents,” Journal of Power Sources, vol. 495, no. 229820, 2021, doi: 10.1016/j.jpowsour.2021.229820.

KÜTTINGER, Michael, Ruben BRUNETAUD, Jakub K. WŁODARCZYK, Peter FISCHER und Jens TÜBKE, 2021. Cycle behaviour of hydrogen bromine redox flow battery cells with bromine complexing agents. Journal of Power Sources. 2021. Bd. 495, Nr. 229820. DOI 10.1016/j.jpowsour.2021.229820

Küttinger, Michael, Ruben Brunetaud, Jakub K. Włodarczyk, Peter Fischer, and Jens Tübke. 2021. “Cycle Behaviour of Hydrogen Bromine Redox Flow Battery Cells with Bromine Complexing Agents.” Journal of Power Sources 495 (229820). https://doi.org/10.1016/j.jpowsour.2021.229820.

Küttinger, Michael, et al. “Cycle Behaviour of Hydrogen Bromine Redox Flow Battery Cells with Bromine Complexing Agents.” Journal of Power Sources, vol. 495, no. 229820, 2021, https://doi.org/10.1016/j.jpowsour.2021.229820.