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Article: Formation of electrodes by self-assembling porous carbon fibers into bundles for vanadium redox flow batteries

TitleFormation of electrodes by self-assembling porous carbon fibers into bundles for vanadium redox flow batteries
Authors
Keywordsvanadium redox flow battery
Electrospun porous carbon fiber bundles
Mass transport
Self-assembly
Pore size
Issue Date2018
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jpowsour
Citation
Journal of Power Sources, 2018, v. 405, p. 106-113 How to Cite?
AbstractElectrospinning has been employed to fabricate carbonaceous materials with larger surface areas for vanadium redox flow batteries. However, the woven carbon nanofibers prepared with conventional electrospinning methods are plagued by the low porosity and poor permeability, thereby causing a significant mass-transport resistance during the operation of batteries. To tackle this problem, we report a novel method by self-assembling porous carbon fibers into large bundles to form electrodes. This electrode is fabricated by electrospinning polyacrylonitrile and polystyrene binary solutions. Instead of forming single fibers, the individual fibers are self-assembled into fiber bundles by properly managing the viscosity of the precursor solution. The formation of large fiber bundles significantly enlarges the pore size while retaining large specific surface areas. The single cell with the as-prepared electrodes achieves an energy efficiency of 87.7% at a current density of 100 mA cm−2, which is 15.2% higher than that of the single cell with conventional electrospinning electrodes. The energy efficiency still maintains over 80% at 200 mA cm−2. More importantly, the discharge capacity and electrolyte utilization are nearly doubled. All these results demonstrate that this electrode preparation method is effective to improve the mass transport properties of traditional electrospun electrodes in vanadium redox flow batteries.
Persistent Identifierhttp://hdl.handle.net/10722/271240
ISSN
2019 Impact Factor: 8.247
2015 SCImago Journal Rankings: 2.008

 

DC FieldValueLanguage
dc.contributor.authorSun, J-
dc.contributor.authorZeng, L-
dc.contributor.authorJiang, HR-
dc.contributor.authorChao, CYH-
dc.contributor.authorZhao, TS-
dc.date.accessioned2019-06-24T01:06:02Z-
dc.date.available2019-06-24T01:06:02Z-
dc.date.issued2018-
dc.identifier.citationJournal of Power Sources, 2018, v. 405, p. 106-113-
dc.identifier.issn0378-7753-
dc.identifier.urihttp://hdl.handle.net/10722/271240-
dc.description.abstractElectrospinning has been employed to fabricate carbonaceous materials with larger surface areas for vanadium redox flow batteries. However, the woven carbon nanofibers prepared with conventional electrospinning methods are plagued by the low porosity and poor permeability, thereby causing a significant mass-transport resistance during the operation of batteries. To tackle this problem, we report a novel method by self-assembling porous carbon fibers into large bundles to form electrodes. This electrode is fabricated by electrospinning polyacrylonitrile and polystyrene binary solutions. Instead of forming single fibers, the individual fibers are self-assembled into fiber bundles by properly managing the viscosity of the precursor solution. The formation of large fiber bundles significantly enlarges the pore size while retaining large specific surface areas. The single cell with the as-prepared electrodes achieves an energy efficiency of 87.7% at a current density of 100 mA cm−2, which is 15.2% higher than that of the single cell with conventional electrospinning electrodes. The energy efficiency still maintains over 80% at 200 mA cm−2. More importantly, the discharge capacity and electrolyte utilization are nearly doubled. All these results demonstrate that this electrode preparation method is effective to improve the mass transport properties of traditional electrospun electrodes in vanadium redox flow batteries.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jpowsour-
dc.relation.ispartofJournal of Power Sources-
dc.subjectvanadium redox flow battery-
dc.subjectElectrospun porous carbon fiber bundles-
dc.subjectMass transport-
dc.subjectSelf-assembly-
dc.subjectPore size-
dc.titleFormation of electrodes by self-assembling porous carbon fibers into bundles 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.jpowsour.2018.10.035-
dc.identifier.scopuseid_2-s2.0-85054884996-
dc.identifier.hkuros298134-
dc.identifier.volume405-
dc.identifier.spage106-
dc.identifier.epage113-
dc.publisher.placeNetherlands-

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