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Article: Hydrodynamic focusing in microfluidic membraneless fuel cells: Breaking the trade-off between fuel utilization and current density

TitleHydrodynamic focusing in microfluidic membraneless fuel cells: Breaking the trade-off between fuel utilization and current density
Authors
KeywordsComputational fluid dynamics
Current density
Fuel utilization
Hydrodynamic focusing
Microfluidics
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhydene
Citation
International Journal Of Hydrogen Energy, 2011, v. 36 n. 17, p. 11075-11084 How to Cite?
AbstractMicrofluidic membraneless fuel cell (MFC) is a promising fuel cell type due to its simple structure without the need of proton conducting membrane. However, the common disadvantage is the low fuel utilization. Previous works have shown that adopting a conventional method to increase the fuel utilization would cause a low power density. This study shows that the use of hydrodynamic focusing technology can overcome the trade-off problem between the fuel utilization and the current density. A numerical model has been developed to simulate the MFC operation with the fuel stream being hydrodynamically focused by a buffer stream. The results indicate that both fuel utilization and current density can be increased by properly adjusting the buffer flow rate to enhance the flow focusing. The optimal performance is achieved when the buffer-to-fuel flow rate ratio is around 25. Moreover, high fuel flow rate and shallow channel shape have proven beneficial to the cell performance with the use of hydrodynamic focusing technology. It is predicted that a MFC with a current density above 100 mA cm -2 is capable of achieving fuel utilization up to 50%, which is considerably higher than the previously reported value of 5-8%. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/149095
ISSN
2015 Impact Factor: 3.205
2015 SCImago Journal Rankings: 1.330
ISI Accession Number ID
Funding AgencyGrant Number
University of Hong Kong10207828
Funding Information:

The work presented in this paper was supported by a grant from The University of Hong Kong (project no. 10207828).

References

 

DC FieldValueLanguage
dc.contributor.authorXuan, Jen_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorNi, Men_HK
dc.contributor.authorWang, Hen_HK
dc.date.accessioned2012-06-22T06:23:42Z-
dc.date.available2012-06-22T06:23:42Z-
dc.date.issued2011en_HK
dc.identifier.citationInternational Journal Of Hydrogen Energy, 2011, v. 36 n. 17, p. 11075-11084en_HK
dc.identifier.issn0360-3199en_HK
dc.identifier.urihttp://hdl.handle.net/10722/149095-
dc.description.abstractMicrofluidic membraneless fuel cell (MFC) is a promising fuel cell type due to its simple structure without the need of proton conducting membrane. However, the common disadvantage is the low fuel utilization. Previous works have shown that adopting a conventional method to increase the fuel utilization would cause a low power density. This study shows that the use of hydrodynamic focusing technology can overcome the trade-off problem between the fuel utilization and the current density. A numerical model has been developed to simulate the MFC operation with the fuel stream being hydrodynamically focused by a buffer stream. The results indicate that both fuel utilization and current density can be increased by properly adjusting the buffer flow rate to enhance the flow focusing. The optimal performance is achieved when the buffer-to-fuel flow rate ratio is around 25. Moreover, high fuel flow rate and shallow channel shape have proven beneficial to the cell performance with the use of hydrodynamic focusing technology. It is predicted that a MFC with a current density above 100 mA cm -2 is capable of achieving fuel utilization up to 50%, which is considerably higher than the previously reported value of 5-8%. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhydeneen_HK
dc.relation.ispartofInternational Journal of Hydrogen Energyen_HK
dc.subjectComputational fluid dynamicsen_HK
dc.subjectCurrent densityen_HK
dc.subjectFuel utilizationen_HK
dc.subjectHydrodynamic focusingen_HK
dc.subjectMicrofluidicsen_HK
dc.titleHydrodynamic focusing in microfluidic membraneless fuel cells: Breaking the trade-off between fuel utilization and current densityen_HK
dc.typeArticleen_HK
dc.identifier.emailLeung, MKH:en_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.identifier.authorityLeung, MKH=rp00148en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijhydene.2011.05.150en_HK
dc.identifier.scopuseid_2-s2.0-80051600735en_HK
dc.identifier.hkuros200081en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80051600735&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue17en_HK
dc.identifier.spage11075en_HK
dc.identifier.epage11084en_HK
dc.identifier.isiWOS:000295235200070-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXuan, J=25722402300en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridWang, H=36844957100en_HK

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