Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-23667
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dc.contributor.authorKüttinger, Michael-
dc.contributor.authorRiasse, Raphaël-
dc.contributor.authorWlodarczyk, Jakub-
dc.contributor.authorFischer, Peter-
dc.contributor.authorTübke, Jens-
dc.date.accessioned2021-12-08T15:48:26Z-
dc.date.available2021-12-08T15:48:26Z-
dc.date.issued2022-02-01-
dc.identifier.issn0378-7753de_CH
dc.identifier.issn1873-2755de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/23667-
dc.description.abstractHydrogen bromine redox flow batteries utilize bromine electrolytes in their positive half cell, offering capacities larger than 100 Ah/L. Addition of quaternary ammonium compounds, so-called bromine complexing agents (BCA), may increase safety as they reduce the vapour pressure of bromine in the posolyte. However, they have not been applied so far. They (a) interact with perfluorosulfonic acid membranes leading to significant reduction of membrane conductivity and (b) they form a low conductive ionic liquid with polybromides, leading to high overvoltage if the formation happens at the electrode. In this work a solution to this problem is proposed by an excess addition of Br2 to these electrolytes. The excess bromine leads to a permanent bromine fused salt phase in the tank. Bromine formed in the cell stays in the aqueous phase and bromine transfer between the two phases happens in the tank. Transfer of Br2 without the transfer of [BCA]+ cations exists between the phases, while [C2Py]+ cations remain in the fused salt and do not influence cell performance. For the first time a posolyte capacity of 179.6 Ah/L based on 7.7 M hydrobromic acid with BCA is achieved compared to previous investigations with e.g. 53.9 Ah/L.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.subjectBromine posolytesde_CH
dc.subjectBromine complexing agentde_CH
dc.subjectComplexation reactionde_CH
dc.subjectStorage capacityde_CH
dc.subjectCycling performancede_CH
dc.subject.ddc621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnikde_CH
dc.titleImprovement of safe bromine electrolytes and their cell performance in H2/Br2 flow batteries caused by tuning the bromine complexation equilibriumde_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.2021.230804de_CH
dc.identifier.doi10.21256/zhaw-23667-
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.issue230804de_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume520de_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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