Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-23027
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dc.contributor.authorWlodarczyk, Jakub K.-
dc.contributor.authorKüttinger, Michael-
dc.contributor.authorFriedrich, Andreas K.-
dc.contributor.authorSchumacher, Jürgen O.-
dc.date.accessioned2021-08-26T12:17:47Z-
dc.date.available2021-08-26T12:17:47Z-
dc.date.issued2021-08-06-
dc.identifier.issn0378-7753de_CH
dc.identifier.issn1873-2755de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/23027-
dc.description.abstractThermodynamic 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.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofJournal of Power Sourcesde_CH
dc.rightshttp://creativecommons.org/licenses/by/4.0/de_CH
dc.subjectRedox flow batteryde_CH
dc.subjectRenewable energyde_CH
dc.subjectBromine complexationde_CH
dc.subjectEnergy storagede_CH
dc.subjectThermodynamicsde_CH
dc.subjectConcentrated electrolytesde_CH
dc.subject.ddc621.04: Energietechnikde_CH
dc.titleExploring the thermodynamics of the bromine electrode in concentrated solutions for improved parametrisation of hydrogen-bromine flow battery modelsde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
dc.identifier.doi10.1016/j.jpowsour.2021.230202de_CH
dc.identifier.doi10.21256/zhaw-23027-
zhaw.funding.euinfo:eu-repo/grantAgreement/EC/H2020/765289// European Training Network to improve materials for high-performance, low-cost next- generation redox-flow batteries/FlowCampde_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume508de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedChemieingenieurwesende_CH
zhaw.webfeedErneuerbare Energiende_CH
zhaw.webfeedÖkotechnologiede_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
Appears in collections:Publikationen School of Engineering



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