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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|
Włodarczyk, Jakub K.
|Published in:||Journal of Power Sources|
|Publisher / Ed. Institution:||Elsevier|
|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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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, 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.
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