Comparative Analysis of Thermal Activation on Felts and Continuous Carbon Filament Electrodes for Vanadium Redox Flow Batteries

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dc.contributor.authorNoemí Aguiló Aguayo, Noemícs
dc.contributor.authorEbert, Toni Alenacs
dc.contributor.authorAmade, Rogercs
dc.contributor.authorBertran, Enriccs
dc.contributor.authorOspina, Rogeliocs
dc.contributor.authorRodriguez Pereira, Jhonatancs
dc.contributor.authorde Leon, Carlos Poncecs
dc.contributor.authorBechtold, Thomascs
dc.contributor.authorPham, Tungcs
dc.coverage.issue21cs
dc.coverage.volume11cs
dc.date.accessioned2025-04-08T08:56:10Z
dc.date.available2025-04-08T08:56:10Z
dc.date.issued2024-11-04cs
dc.description.abstractThermal treatments are commonly used to improve electrode kinetics in vanadium redox flow batteries (VRFB). The impact of the widely adopted thermal treatment-400 degrees C for least 24 hours-was investigated on polyacrylonitrile (PAN)-based continuous carbon filaments (tows) and compared to PAN-based graphite felts. Surface properties were assessed with scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and wettability measurements. The electrode activity was investigated via electrochemical impedance spectroscopy (EIS). Charge-transfer resistances and the constant phase element parameters related to the electric double layer were determined, revealing a correlation between enhanced electrode activity and increased double layer across all electrodes. An 8-hour 400 degrees C thermal treatment was sufficient to improve electrode activity for tows, whereas felts required longer durations, up to 24 hours, attributed to differences in the carbonization process employed for each material, with the tows undergoing continuous processing and the felts following a batch process. Three-electrode half-cell EIS measurements were conducted to elucidate positive and negative electrode contributions. Activated continuous carbon filament electrodes exhibited consistent electrode activities in both the catholyte (VO2+/VO2+) and anolyte (V3+/V2+), whereas the electrochemical activity of felts was limited by the electrode deactivation in the anolyte.en
dc.formattextcs
dc.format.extent1-13cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationChemElectroChem. 2024, vol. 11, issue 21, p. 1-13.en
dc.identifier.doi10.1002/celc.202400417cs
dc.identifier.issn2196-0216cs
dc.identifier.other191236cs
dc.identifier.urihttps://hdl.handle.net/11012/250840
dc.language.isoencs
dc.publisherWILEY-V C H VERLAG GMBHcs
dc.relation.ispartofChemElectroChemcs
dc.relation.urihttps://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/celc.202400417cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2196-0216/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectCarbon fibersen
dc.subjectCarbon feltsen
dc.subjectCarbon towsen
dc.subjectEISen
dc.subjectRamanen
dc.subjectThermal treatmenten
dc.subjectVanadium redox flow batteriesen
dc.subjectXPSen
dc.titleComparative Analysis of Thermal Activation on Felts and Continuous Carbon Filament Electrodes for Vanadium Redox Flow Batteriesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-191236en
sync.item.dbtypeVAVen
sync.item.insts2025.04.08 10:56:10en
sync.item.modts2025.04.08 10:33:35en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé nízkodimenzionální nanomateriálycs
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