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Article: Towards uniform distributions of reactants via the aligned electrode design for vanadium redox flow batteries

TitleTowards uniform distributions of reactants via the aligned electrode design for vanadium redox flow batteries
Authors
KeywordsAligned fiber
Uniform distribution
Concentration polarization
Electrospinning
Vanadium redox flow battery
Issue Date2020
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/apenergy
Citation
Applied Energy, 2020, v. 259, p. article no. 114198 How to Cite?
AbstractEnhancing the hydraulic permeability of electrodes along both the through-plane and in-plane directions is essential in flow-field structured vanadium redox flow batteries, as it can promote uniform distributions of reactants, lower the concentration overpotential, and therefore improve battery performances. In this work, uniaxially-aligned carbon fiber electrodes with the fiber diameter ranging from 7 to 12 µm (average ~10 µm) are fabricated by electrospinning method. Attributed to the enhanced permeability of the aligned structure, the battery assembled with the prepared electrodes exhibits an energy efficiency of 84.4% at a current density of 100 mA cm−2, which is 13.2% higher than that with conventional electrospun fiber electrodes. The permeability in the in-plane direction is further tailored by adjusting the orientation of aligned fibers against the flow channels. Results show that when the orientation of aligned fibers is perpendicular to the direction of flow channels, the battery delivers the largest discharge capacity and the highest limiting current density (~900 mA cm−2). Such an enhancement in the battery performance can be ascribed to the more uniform in-plane distribution of reactants and current by maximizing the permeability along the direction vertical to the flow channels, as evidenced by a three-dimensional model.
Persistent Identifierhttp://hdl.handle.net/10722/290183
ISSN
2023 Impact Factor: 10.1
2023 SCImago Journal Rankings: 2.820
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSun, J-
dc.contributor.authorJiang, HR-
dc.contributor.authorZhang, BW-
dc.contributor.authorChao, CYH-
dc.contributor.authorZhao, TS-
dc.date.accessioned2020-10-22T08:23:13Z-
dc.date.available2020-10-22T08:23:13Z-
dc.date.issued2020-
dc.identifier.citationApplied Energy, 2020, v. 259, p. article no. 114198-
dc.identifier.issn0306-2619-
dc.identifier.urihttp://hdl.handle.net/10722/290183-
dc.description.abstractEnhancing the hydraulic permeability of electrodes along both the through-plane and in-plane directions is essential in flow-field structured vanadium redox flow batteries, as it can promote uniform distributions of reactants, lower the concentration overpotential, and therefore improve battery performances. In this work, uniaxially-aligned carbon fiber electrodes with the fiber diameter ranging from 7 to 12 µm (average ~10 µm) are fabricated by electrospinning method. Attributed to the enhanced permeability of the aligned structure, the battery assembled with the prepared electrodes exhibits an energy efficiency of 84.4% at a current density of 100 mA cm−2, which is 13.2% higher than that with conventional electrospun fiber electrodes. The permeability in the in-plane direction is further tailored by adjusting the orientation of aligned fibers against the flow channels. Results show that when the orientation of aligned fibers is perpendicular to the direction of flow channels, the battery delivers the largest discharge capacity and the highest limiting current density (~900 mA cm−2). Such an enhancement in the battery performance can be ascribed to the more uniform in-plane distribution of reactants and current by maximizing the permeability along the direction vertical to the flow channels, as evidenced by a three-dimensional model.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/apenergy-
dc.relation.ispartofApplied Energy-
dc.subjectAligned fiber-
dc.subjectUniform distribution-
dc.subjectConcentration polarization-
dc.subjectElectrospinning-
dc.subjectVanadium redox flow battery-
dc.titleTowards uniform distributions of reactants via the aligned electrode design for vanadium redox flow batteries-
dc.typeArticle-
dc.identifier.emailChao, CYH: cyhchao@hku.hk-
dc.identifier.authorityChao, CYH=rp02396-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.apenergy.2019.114198-
dc.identifier.scopuseid_2-s2.0-85075890440-
dc.identifier.hkuros316087-
dc.identifier.volume259-
dc.identifier.spagearticle no. 114198-
dc.identifier.epagearticle no. 114198-
dc.identifier.isiWOS:000506575800090-
dc.publisher.placeUnited Kingdom-

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