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Article: A computational study of bifunctional oxygen electrode in air-breathing reversible microfluidic fuel cells

TitleA computational study of bifunctional oxygen electrode in air-breathing reversible microfluidic fuel cells
Authors
KeywordsBifunctional oxygen electrode
Computational fluid dynamics
Membraneless fuel cell
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. 15, p. 9231-9241 How to Cite?
AbstractAir-breathing reversible microfluidic fuel cell (RMFC) provides flexibility to choose either acid or alkaline medium for the bifunctional oxygen electrode. A numerical model has been developed and validated to predict the performance of an air-breathing RMFC. Half-cell J-V characteristics of the RMFC using different pH media for the oxygen electrode are compared. The model results suggest that when the RMFC is operated in fuel cell (FC) mode, alkaline medium is preferred for the oxygen electrode, and when operated in electrolysis-cell (EC) mode, acid medium is preferred. By further analyzing the round-trip energy efficiency and major potential loss of the half-cell, it is found that adopting acid medium for oxygen electrode can maximize the overall charging/discharging cycle efficiency and performance of RMFC, due to much lower activation overpotential in the EC mode. Heat and mass transport characteristics of the half-cell are also investigated. It is found that the flowing electrolyte can efficiently remove the heat generated by various sources in the RMFC, leading to the mass convection in the oxygen electrode and surrounding environment solely driven by concentration gradient. Due to the presence of water vapor as the reaction product, FC mode operation in acid medium yields the most intensive breathing process of the oxygen electrode. The results provide implications to further optimizations of RMFC. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/149094
ISSN
2015 Impact Factor: 3.205
2015 SCImago Journal Rankings: 1.330
ISI Accession Number ID
Funding AgencyGrant Number
HKU
Funding Information:

The research work reported in this paper is supported by the HKU SPACE Research Fund.

References

 

DC FieldValueLanguage
dc.contributor.authorXuan, Jen_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorLeung, MKHen_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. 15, p. 9231-9241en_HK
dc.identifier.issn0360-3199en_HK
dc.identifier.urihttp://hdl.handle.net/10722/149094-
dc.description.abstractAir-breathing reversible microfluidic fuel cell (RMFC) provides flexibility to choose either acid or alkaline medium for the bifunctional oxygen electrode. A numerical model has been developed and validated to predict the performance of an air-breathing RMFC. Half-cell J-V characteristics of the RMFC using different pH media for the oxygen electrode are compared. The model results suggest that when the RMFC is operated in fuel cell (FC) mode, alkaline medium is preferred for the oxygen electrode, and when operated in electrolysis-cell (EC) mode, acid medium is preferred. By further analyzing the round-trip energy efficiency and major potential loss of the half-cell, it is found that adopting acid medium for oxygen electrode can maximize the overall charging/discharging cycle efficiency and performance of RMFC, due to much lower activation overpotential in the EC mode. Heat and mass transport characteristics of the half-cell are also investigated. It is found that the flowing electrolyte can efficiently remove the heat generated by various sources in the RMFC, leading to the mass convection in the oxygen electrode and surrounding environment solely driven by concentration gradient. Due to the presence of water vapor as the reaction product, FC mode operation in acid medium yields the most intensive breathing process of the oxygen electrode. The results provide implications to further optimizations of RMFC. © 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.subjectBifunctional oxygen electrodeen_HK
dc.subjectComputational fluid dynamicsen_HK
dc.subjectMembraneless fuel cellen_HK
dc.subjectMicrofluidicsen_HK
dc.titleA computational study of bifunctional oxygen electrode in air-breathing reversible microfluidic fuel cellsen_HK
dc.typeArticleen_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.identifier.emailLeung, MKH:en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.identifier.authorityLeung, MKH=rp00148en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijhydene.2011.04.151en_HK
dc.identifier.scopuseid_2-s2.0-79958849348en_HK
dc.identifier.hkuros200079en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79958849348&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue15en_HK
dc.identifier.spage9231en_HK
dc.identifier.epage9241en_HK
dc.identifier.isiWOS:000292944500048-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXuan, J=25722402300en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridWang, H=36844957100en_HK

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