Wlodarczyk, Jakub K. und Küttinger, Michael und Friedrich, Kaspar Andreas und Schumacher, Jürgen 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, Seiten 230202-230215. Elsevier. doi: 10.1016/j.jpowsour.2021.230202. ISSN 0378-7753.
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Kurzfassung
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 junctionfree 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.
elib-URL des Eintrags: | https://elib.dlr.de/148185/ | ||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
Titel: | Exploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen–bromine flow battery models | ||||||||||||||||||||
Autoren: |
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Datum: | 6 August 2021 | ||||||||||||||||||||
Erschienen in: | Journal of Power Sources | ||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||
Band: | 508 | ||||||||||||||||||||
DOI: | 10.1016/j.jpowsour.2021.230202 | ||||||||||||||||||||
Seitenbereich: | Seiten 230202-230215 | ||||||||||||||||||||
Verlag: | Elsevier | ||||||||||||||||||||
ISSN: | 0378-7753 | ||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||
Stichwörter: | Modelling and simulation hydrogen–bromine redox flow battery Open circuit potential Bromine electrode Activity coefficient | ||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||
HGF - Programm: | Materialien und Technologien für die Energiewende | ||||||||||||||||||||
HGF - Programmthema: | Elektrochemische Energiespeicherung | ||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||
DLR - Forschungsgebiet: | E SP - Energiespeicher | ||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Speicher | ||||||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Elektrochemische Energietechnik | ||||||||||||||||||||
Hinterlegt von: | Friedrich, Prof.Dr. Kaspar Andreas | ||||||||||||||||||||
Hinterlegt am: | 12 Jan 2022 11:45 | ||||||||||||||||||||
Letzte Änderung: | 04 Dez 2023 12:49 |
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