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https://doi.org/10.21256/zhaw-23027| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery models |
| Autor/-in: | Wlodarczyk, Jakub K. Küttinger, Michael Friedrich, Andreas K. Schumacher, Jürgen O. |
| et. al: | No |
| DOI: | 10.1016/j.jpowsour.2021.230202 10.21256/zhaw-23027 |
| Erschienen in: | Journal of Power Sources |
| Band(Heft): | 508 |
| Erscheinungsdatum: | 6-Aug-2021 |
| Verlag / Hrsg. Institution: | Elsevier |
| ISSN: | 0378-7753 1873-2755 |
| Sprache: | Englisch |
| Schlagwörter: | Redox flow battery; Renewable energy; Bromine complexation; Energy storage; Thermodynamics; Concentrated electrolytes |
| Fachgebiet (DDC): | 621.04: Energietechnik |
| Zusammenfassung: | Thermodynamic properties of the bromine electrode in an exemplary hydrogen–bromine flow battery (HBFB) are investigated in detail. Open-circuit potential (OCP) measurements of HBRB electrolytes in a liquid junction-free setup and electrolyte Raman spectra are employed to estimate polybromides speciation. An improved mathematical description of the bromine electrode OCP versus state of charge is provided. This paper addresses the phenomenon of polybromides formation at concentrations up to 7.7 mol L-1 HBr and 3.85 mol L-1 Br2 and their significant impact on the OCP. The model takes into account tri-, penta- and heptabromides formation, precisely modelled electrolyte activity coefficients (up to 11-molal HBr), electrolyte density, and temperature. It is elucidated that the polybromide formation constants found in literature treating dilute electrolytes are substantially too low. Newly determined equilibrium constants, applicable over a wider concentration range are provided for 25 and 43 °C together with their standard enthalpy changes. The model is successfully validated in an independent experiment using a real, pilot-scale HBFB. It is concluded that the usage of a simple Nernst-like equation to calculate the OCP of flow battery electrodes containing concentrated electrolytes leads to erroneous results. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/23027 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | CC BY 4.0: Namensnennung 4.0 International |
| 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_Wlodarczyk_Exploring_the_thermodynamics_of_the_bromine_electrode_Journal_of_Power_Sources.pdf | 1.5 MB | Adobe PDF |  Öffnen/Anzeigen |
Zur Langanzeige
Wlodarczyk, J. K., Küttinger, M., Friedrich, A. K., & Schumacher, J. O. (2021). Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery models. Journal of Power Sources, 508. https://doi.org/10.1016/j.jpowsour.2021.230202
Wlodarczyk, J.K. et al. (2021) ‘Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery models’, Journal of Power Sources, 508. Available at: https://doi.org/10.1016/j.jpowsour.2021.230202.
J. K. Wlodarczyk, M. Küttinger, A. K. Friedrich, and J. O. Schumacher, “Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery models,” Journal of Power Sources, vol. 508, Aug. 2021, doi: 10.1016/j.jpowsour.2021.230202.
WLODARCZYK, Jakub K., Michael KÜTTINGER, Andreas K. FRIEDRICH und Jürgen O. SCHUMACHER, 2021. Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery models. Journal of Power Sources. 6 August 2021. Bd. 508. DOI 10.1016/j.jpowsour.2021.230202
Wlodarczyk, Jakub K., Michael Küttinger, Andreas K. Friedrich, and Jürgen O. Schumacher. 2021. “Exploring the Thermodynamics of the Bromine Electrode in Concentrated Solutions for Improved Parametrisation of Hydrogen-Bromine Flow Battery Models.” Journal of Power Sources 508 (August). https://doi.org/10.1016/j.jpowsour.2021.230202.
Wlodarczyk, Jakub K., et al. “Exploring the Thermodynamics of the Bromine Electrode in Concentrated Solutions for Improved Parametrisation of Hydrogen-Bromine Flow Battery Models.” Journal of Power Sources, vol. 508, Aug. 2021, https://doi.org/10.1016/j.jpowsour.2021.230202.
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