Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte

Wlodarczyk, Jakub; Baltes, Norman; Friedrich, K. Andreas; Schumacher, Jürgen

doi:10.1016/j.electacta.2023.142640

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-27957

Full metadata record

DC Field	Value	Language
dc.contributor.author	Wlodarczyk, Jakub	-
dc.contributor.author	Baltes, Norman	-
dc.contributor.author	Friedrich, K. Andreas	-
dc.contributor.author	Schumacher, Jürgen	-
dc.date.accessioned	2023-06-02T06:30:50Z	-
dc.date.available	2023-06-02T06:30:50Z	-
dc.date.issued	2023-05-27	-
dc.identifier.issn	0013-4686	de_CH
dc.identifier.issn	1873-3859	de_CH
dc.identifier.uri	https://digitalcollection.zhaw.ch/handle/11475/27957	-
dc.description.abstract	Modelling and simulation is a powerful tool to support the development of novel flow cells such as electrolysers and flow batteries. Electrolytes employed in such cells often consist of aqueous solutions of highly concentrated solutes at elevated temperatures. Such conditions pose numerous challenges in conventional model parametrisation because of non-ideal behaviour of the electrolytes. The aim of this work is to study mass transport of electroactive species in highly-concentrated media. We selected the hydrogen-bromine flow battery posolyte, HBr (aq) and Br2, as an exemplary flow battery electrolyte and we leveraged chronoamperometric techniques involving ultramicroelectrodes to study diffusion and migration of bromide and bromine at high concentration and temperature. We successfully simulated the current densities of HBr/Br2 redox reactions in solutions up to 8 mol L–1 using advanced mass transport theory which agreed well with the results obtained with ultramicroelectrodes. While uncharged species transport (Br2) can be credibly modelled using conventional theories such as Fick’s law, charged species (Br–) require special treatment as the diffusion coefficient vary with concentration up to 50 % with respect to the limiting value at infinite dilution. The transport of charged species without added supporting electrolyte occurs via both migration and diffusion and the contribution of migration current may be up to 50 % of the total current. At HBr concentration 0.6 mol L–1 migration appears to be suppressed due to the “self-screening” effect of the electrolyte. Proper experimental electrolyte characterisation under operating conditions similar to the actual flow cell applications is indispensable to establish predictive models and digital twins of electrochemical devices. Straightforward transfer of concepts known in electro-analytical chemistry to flow cells modelling may lead to erroneous simulations or model overfitting.	de_CH
dc.language.iso	en	de_CH
dc.publisher	Elsevier	de_CH
dc.relation.ispartof	Electrochimica Acta	de_CH
dc.rights	http://creativecommons.org/licenses/by/4.0/	de_CH
dc.subject	Concentrated electrolyte	de_CH
dc.subject	Hydrogen-bromine flow battery	de_CH
dc.subject	Mass transport	de_CH
dc.subject	Ultramicroelectrode	de_CH
dc.subject	Energy storage	de_CH
dc.subject.ddc	621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnik	de_CH
dc.title	Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte	de_CH
dc.type	Beitrag in wissenschaftlicher Zeitschrift	de_CH
dcterms.type	Text	de_CH
zhaw.departement	School of Engineering	de_CH
zhaw.organisationalunit	Institute of Computational Physics (ICP)	de_CH
dc.identifier.doi	10.1016/j.electacta.2023.142640	de_CH
dc.identifier.doi	10.21256/zhaw-27957	-
zhaw.funding.eu	info:eu-repo/grantAgreement/EC/H2020/765289// European Training Network to improve materials for high-performance, low-cost next- generation redox-flow batteries/FlowCamp	de_CH
zhaw.issue	142640	de_CH
zhaw.originated.zhaw	Yes	de_CH
zhaw.publication.status	publishedVersion	de_CH
zhaw.volume	461	de_CH
zhaw.publication.review	Peer review (Publikation)	de_CH
zhaw.webfeed	Elektrische Energiesysteme und Smart Grids	de_CH
zhaw.funding.zhaw	Redox Flow Battery Campus	de_CH
zhaw.author.additional	No	de_CH
zhaw.display.portrait	Yes	de_CH
Appears in collections:	Publikationen School of Engineering

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Wlodarczyk, J., Baltes, N., Friedrich, K. A., & Schumacher, J. (2023). Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte. Electrochimica Acta, 461(142640). https://doi.org/10.1016/j.electacta.2023.142640

Wlodarczyk, J. et al. (2023) ‘Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte’, Electrochimica Acta, 461(142640). Available at: https://doi.org/10.1016/j.electacta.2023.142640.

J. Wlodarczyk, N. Baltes, K. A. Friedrich, and J. Schumacher, “Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte,” Electrochimica Acta, vol. 461, no. 142640, May 2023, doi: 10.1016/j.electacta.2023.142640.

WLODARCZYK, Jakub, Norman BALTES, K. Andreas FRIEDRICH und Jürgen SCHUMACHER, 2023. Mass transport limitations in concentrated aqueous electrolyte solutions : theoretical and experimental study of the hydrogen-bromine flow battery electrolyte. Electrochimica Acta. 27 Mai 2023. Bd. 461, Nr. 142640. DOI 10.1016/j.electacta.2023.142640

Wlodarczyk, Jakub, Norman Baltes, K. Andreas Friedrich, and Jürgen Schumacher. 2023. “Mass Transport Limitations in Concentrated Aqueous Electrolyte Solutions : Theoretical and Experimental Study of the Hydrogen-Bromine Flow Battery Electrolyte.” Electrochimica Acta 461 (142640). https://doi.org/10.1016/j.electacta.2023.142640.

Wlodarczyk, Jakub, et al. “Mass Transport Limitations in Concentrated Aqueous Electrolyte Solutions : Theoretical and Experimental Study of the Hydrogen-Bromine Flow Battery Electrolyte.” Electrochimica Acta, vol. 461, no. 142640, May 2023, https://doi.org/10.1016/j.electacta.2023.142640.