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https://doi.org/10.21256/zhaw-22252| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | High energy density electrolytes for H2/Br2 redox flow batteries, their polybromide composition and influence on battery cycling limits |
| Autor/-in: | Küttinger, Michael Wlodarczyk, Jakub K. Daubner, Daniela Fischer, Peter Tübke, Jens |
| et. al: | No |
| DOI: | 10.1039/D0RA10721B 10.21256/zhaw-22252 |
| Erschienen in: | RSC Advances |
| Band(Heft): | 11 |
| Heft: | 9 |
| Seite(n): | 5218 |
| Seiten bis: | 5229 |
| Erscheinungsdatum: | 2021 |
| Verlag / Hrsg. Institution: | Royal Society of Chemistry |
| ISSN: | 2046-2069 |
| Sprache: | Englisch |
| Schlagwörter: | Flow battery; Bromine; Energy storage; Renewable energy; Hydrogen; Redox flow battery |
| Fachgebiet (DDC): | 621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnik |
| Zusammenfassung: | Hydrogen–bromine redox flow batteries (H2/Br2-RFB) are a promising stationary energy storage solution, offering energy storage densities up to 200 W h L−1. In this study, high energy density electrolytes of concentrated hydrobromic acid of up to 7.7 M are investigated. Particular polybromide ion (Br2n+1−; n = 1–3) concentrations in the electrolyte at different states of charge, their effect on the electrolytic conductivity and cell operation limits are investigated for the first time. The concentrations of individual polybromides in the electrolytes are determined by Raman spectroscopy. Tribromide (Br3−) and pentabromide (Br5−) are predominantly present in equal concentrations over the entire concentration range. Besides Br3− and Br5−, heptabromide (Br7−) exists in the electrolyte solution at higher bromine concentrations. It is shown that polybromide equilibria and their constants of Br3− and Br5− from literature are not applicable for highly concentrated solutions. The conductivity of the electrolytes depends primarily on the high proton concentration. The presence of higher polybromides leads to lower conductivities. The solubility of bromine increases disproportionately with increasing bromide concentration, since higher polybromides such as Br7− or Br5− are preferably formed with increasing bromide concentration. Cycling experiments on electrolyte in a single cell are performed and combined with limitations due to electrolyte conductivity and bromine solubility. Based on these results concentrations of the electrolyte are defined for potential operation in a H2/Br2-RFB in the range 1.0 M < c(HBr) < 7.7 M and c(Br2) < 3.35 M, leading to a theoretical energy density of 196 W h L−1. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/22252 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | CC BY 3.0: Namensnennung 3.0 Unported |
| Departement: | School of Engineering |
| Organisationseinheit: | Institute of Computational Physics (ICP) |
| Enthalten in den Sammlungen: | Publikationen School of Engineering |
Dateien zu dieser Ressource:
| Datei | Beschreibung | Größe | Format | |
|---|---|---|---|---|
| 2021_Kuettinger-etal_High-energy-density-electrolytes-redox-flow-batteries.pdf | 1.87 MB | Adobe PDF |  Öffnen/Anzeigen |
Zur Langanzeige
Küttinger, M., Wlodarczyk, J. K., Daubner, D., Fischer, P., & Tübke, J. (2021). High energy density electrolytes for H2/Br2 redox flow batteries, their polybromide composition and influence on battery cycling limits. RSC Advances, 11(9), 5218–5229. https://doi.org/10.1039/D0RA10721B
Küttinger, M. et al. (2021) ‘High energy density electrolytes for H2/Br2 redox flow batteries, their polybromide composition and influence on battery cycling limits’, RSC Advances, 11(9), pp. 5218–5229. Available at: https://doi.org/10.1039/D0RA10721B.
M. Küttinger, J. K. Wlodarczyk, D. Daubner, P. Fischer, and J. Tübke, “High energy density electrolytes for H2/Br2 redox flow batteries, their polybromide composition and influence on battery cycling limits,” RSC Advances, vol. 11, no. 9, pp. 5218–5229, 2021, doi: 10.1039/D0RA10721B.
KÜTTINGER, Michael, Jakub K. WLODARCZYK, Daniela DAUBNER, Peter FISCHER und Jens TÜBKE, 2021. High energy density electrolytes for H2/Br2 redox flow batteries, their polybromide composition and influence on battery cycling limits. RSC Advances. 2021. Bd. 11, Nr. 9, S. 5218–5229. DOI 10.1039/D0RA10721B
Küttinger, Michael, Jakub K. Wlodarczyk, Daniela Daubner, Peter Fischer, and Jens Tübke. 2021. “High Energy Density Electrolytes for H2/Br2 Redox Flow Batteries, Their Polybromide Composition and Influence on Battery Cycling Limits.” RSC Advances 11 (9): 5218–29. https://doi.org/10.1039/D0RA10721B.
Küttinger, Michael, et al. “High Energy Density Electrolytes for H2/Br2 Redox Flow Batteries, Their Polybromide Composition and Influence on Battery Cycling Limits.” RSC Advances, vol. 11, no. 9, 2021, pp. 5218–29, https://doi.org/10.1039/D0RA10721B.
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