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Article: Micro-scale modelling of solid oxide fuel cells with micro-structurally graded electrodes

TitleMicro-scale modelling of solid oxide fuel cells with micro-structurally graded electrodes
Authors
KeywordsFunctionally-graded electrodes
Multi-component mass transfer
Parametric analyses
Porous media
SOFC
Issue Date2007
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/jpowsour
Citation
Journal Of Power Sources, 2007, v. 168 n. 2, p. 369-378 How to Cite?
AbstractA mathematical model was developed for modelling the performance of solid oxide fuel cell (SOFC) with functionally graded electrodes at the micro-scale level. The model considered all forms of overpotentials and was able to capture the coupled electrochemical reactions and mass transfer involved in the SOFC operation. The model was validated by comparing the simulation results with experimental data from the literature. Additional modelling analyses were conducted to gain better understanding of the SOFC working mechanisms at the micro-scale level and to quantify the performance of micro-structurally graded SOFC. It was found that micro-structural grading could significantly enhance the gas transport but had negligible effects on the ohmic and activation overpotentials, especially for thick electrodes. However, for thin electrodes with large particles, too much grading should be avoided as the increased activation overpotentials may result in higher overall overpotentials at a medium or low current density. Among all the cases tested in the present study, the micro-structurally graded SOFC showed significantly higher power density than conventional SOFC of uniform porosity and particle size. The difference between micro-structurally graded SOFC and conventional SOFC is more pronounced for smaller electrode-electrolyte (EE) interfacial particles. Particle size grading is generally more effective than porosity grading and it can increase the maximum power density by one-fold in comparison with conventional SOFC. The present study reveals the working mechanisms of SOFC at the micro-scale level and demonstrates the promise of the use of micro-structural grading to enhance the SOFC performance. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/76168
ISSN
2015 Impact Factor: 6.333
2015 SCImago Journal Rankings: 2.008
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:18:18Z-
dc.date.available2010-09-06T07:18:18Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal Of Power Sources, 2007, v. 168 n. 2, p. 369-378en_HK
dc.identifier.issn0378-7753en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76168-
dc.description.abstractA mathematical model was developed for modelling the performance of solid oxide fuel cell (SOFC) with functionally graded electrodes at the micro-scale level. The model considered all forms of overpotentials and was able to capture the coupled electrochemical reactions and mass transfer involved in the SOFC operation. The model was validated by comparing the simulation results with experimental data from the literature. Additional modelling analyses were conducted to gain better understanding of the SOFC working mechanisms at the micro-scale level and to quantify the performance of micro-structurally graded SOFC. It was found that micro-structural grading could significantly enhance the gas transport but had negligible effects on the ohmic and activation overpotentials, especially for thick electrodes. However, for thin electrodes with large particles, too much grading should be avoided as the increased activation overpotentials may result in higher overall overpotentials at a medium or low current density. Among all the cases tested in the present study, the micro-structurally graded SOFC showed significantly higher power density than conventional SOFC of uniform porosity and particle size. The difference between micro-structurally graded SOFC and conventional SOFC is more pronounced for smaller electrode-electrolyte (EE) interfacial particles. Particle size grading is generally more effective than porosity grading and it can increase the maximum power density by one-fold in comparison with conventional SOFC. The present study reveals the working mechanisms of SOFC at the micro-scale level and demonstrates the promise of the use of micro-structural grading to enhance the SOFC performance. © 2007 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/jpowsouren_HK
dc.relation.ispartofJournal of Power Sourcesen_HK
dc.subjectFunctionally-graded electrodesen_HK
dc.subjectMulti-component mass transferen_HK
dc.subjectParametric analysesen_HK
dc.subjectPorous mediaen_HK
dc.subjectSOFCen_HK
dc.titleMicro-scale modelling of solid oxide fuel cells with micro-structurally graded electrodesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0378-7753&volume=168&spage=369&epage=378&date=2007&atitle=Micro-scale+modelling+of+solid+oxide+fuel+cells+with+micro-structurally+graded+electrodesen_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.jpowsour.2007.03.005en_HK
dc.identifier.scopuseid_2-s2.0-34247554836en_HK
dc.identifier.hkuros132225en_HK
dc.identifier.hkuros142196-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247554836&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume168en_HK
dc.identifier.issue2en_HK
dc.identifier.spage369en_HK
dc.identifier.epage378en_HK
dc.identifier.isiWOS:000247055200010-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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