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Investigating the V(IV)/V(V) electrode reaction in a vanadium redox flow battery – A distribution of relaxation times analysis

Schilling, Monja 1; Braig, Michael 1; Köble, Kerstin 1; Zeis, Roswitha 1
1 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

Abstract:

Due to the worldwide increasing energy demand and the urgency to act due to climate change, new energy storage technologies are required to balance the intermittent power supply of renewable energy sources. While the vanadium redox flow battery (VRFB) must still overcome lifetime and efficiency challenges, the technology is a promising candidate for large-scale energy storage. Thus, conducting experiments in a setup that closely mimics the operating conditions is vital for gaining new insights into the reactions and transport processes in a VRFB. We developed a novel 3D printed flow cell to study the individual half cell reactions of a VRFB under precisely controlled operating conditions. Using electrochemical impedance spectroscopy combined with the distribution of relaxation times analysis, we could identify the processes occurring in the half cell with the V(IV)/V(V) redox reaction by varying experimental parameters. We assigned peaks in different frequency ranges to the electrochemical reaction, the transport processes through the porous electrode structure, and the ion transport. This information is essential in the search for optimized operating conditions to improve the VRFB efficiency.


Verlagsausgabe §
DOI: 10.5445/IR/1000150540
Veröffentlicht am 14.09.2022
Originalveröffentlichung
DOI: 10.1016/j.electacta.2022.141058
Scopus
Zitationen: 18
Web of Science
Zitationen: 18
Dimensions
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2022
Sprache Englisch
Identifikator ISSN: 0013-4686, 1873-3859
KITopen-ID: 1000150540
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in Electrochimica Acta
Verlag Elsevier
Band 430
Seiten Art.-Nr.: 141058
Vorab online veröffentlicht am 24.08.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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