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Article: Electrochemical modeling of ammonia-fed solid oxide fuel cells based on proton conducting electrolyte

TitleElectrochemical modeling of ammonia-fed solid oxide fuel cells based on proton conducting electrolyte
Authors
KeywordsAmmonia catalytic decomposition
Ammonia fuel
Functionally graded materials
Proton-conducting ceramics
Solid oxide fuel cell (SOFC)
Triple phase boundary (TPB)
Issue Date2008
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/jpowsour
Citation
Journal Of Power Sources, 2008, v. 183 n. 2, p. 687-692 How to Cite?
AbstractAn electrochemical model was developed to study the NH3-fed and H2-fed solid oxide fuel cells based on proton conducting electrolyte (SOFC-H). The modeling results were consistent with experimental data in literature. It is found that there is little difference in working voltage and power density between the NH3-fed and the H2-fed SOFC-H with an electrolyte-support configuration due to an extremely high ohmic overpotential in the SOFC-H. With an anode-supported configuration, especially when a thin film electrolyte is used, the H2-fed SOFC-H shows significantly higher voltage and power density than the NH3-fed SOFC-H due to the significant difference in concentration overpotentials. The anode concentration overpotential of the NH3-fed SOFC-H is found much higher than the H2-fed SOFC-H, as the presence of N2 gas dilutes the H2 concentration and slows down the transport of H 2. More importantly, the cathode concentration overpotential is found very significant despite of the thin cathode used in the anode-supported configuration. In the SOFC-H, H2O is produced in the cathode, which enables complete fuel utilization on one hand, but dilutes the concentration of O2 and impedes the diffusion of O2 to the reaction sites on the other hand. Thus, the cathode concentration overpotential is the limiting factor for the H2-fed SOFC-H and an important voltage loss in the NH3-fed SOFC-H. How to reduce the concentration overpotentials at both electrodes is identified crucial to develop high performance SOFC-H. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156974
ISSN
2015 Impact Factor: 6.333
2015 SCImago Journal Rankings: 2.008
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong, PR ChinaHKU7150/05E
CRCG of the University of Hong Kong
Funding Information:

The authors would like to thank the financial support by the Research Grants Council of Hong Kong, PR China (HKU7150/05E) and the CRCG of the University of Hong Kong. The authors also thank Prof. G.Y. Meng (University of Science and Technology of China), Prof. S.H. Chan (Nanyang Technological University, Singapore), and Prof. A.K. Demin (Institute of High Temperature Electrochemistry, Russia) for their discussions and suggestions in SOFC research.

References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorLeung, MKHen_HK
dc.date.accessioned2012-08-08T08:44:46Z-
dc.date.available2012-08-08T08:44:46Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Power Sources, 2008, v. 183 n. 2, p. 687-692en_HK
dc.identifier.issn0378-7753en_HK
dc.identifier.urihttp://hdl.handle.net/10722/156974-
dc.description.abstractAn electrochemical model was developed to study the NH3-fed and H2-fed solid oxide fuel cells based on proton conducting electrolyte (SOFC-H). The modeling results were consistent with experimental data in literature. It is found that there is little difference in working voltage and power density between the NH3-fed and the H2-fed SOFC-H with an electrolyte-support configuration due to an extremely high ohmic overpotential in the SOFC-H. With an anode-supported configuration, especially when a thin film electrolyte is used, the H2-fed SOFC-H shows significantly higher voltage and power density than the NH3-fed SOFC-H due to the significant difference in concentration overpotentials. The anode concentration overpotential of the NH3-fed SOFC-H is found much higher than the H2-fed SOFC-H, as the presence of N2 gas dilutes the H2 concentration and slows down the transport of H 2. More importantly, the cathode concentration overpotential is found very significant despite of the thin cathode used in the anode-supported configuration. In the SOFC-H, H2O is produced in the cathode, which enables complete fuel utilization on one hand, but dilutes the concentration of O2 and impedes the diffusion of O2 to the reaction sites on the other hand. Thus, the cathode concentration overpotential is the limiting factor for the H2-fed SOFC-H and an important voltage loss in the NH3-fed SOFC-H. How to reduce the concentration overpotentials at both electrodes is identified crucial to develop high performance SOFC-H. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
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.subjectAmmonia catalytic decompositionen_HK
dc.subjectAmmonia fuelen_HK
dc.subjectFunctionally graded materialsen_HK
dc.subjectProton-conducting ceramicsen_HK
dc.subjectSolid oxide fuel cell (SOFC)en_HK
dc.subjectTriple phase boundary (TPB)en_HK
dc.titleElectrochemical modeling of ammonia-fed solid oxide fuel cells based on proton conducting electrolyteen_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_fulltexten_US
dc.identifier.doi10.1016/j.jpowsour.2008.05.018en_HK
dc.identifier.scopuseid_2-s2.0-48249139141en_HK
dc.identifier.hkuros148581-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-48249139141&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume183en_HK
dc.identifier.issue2en_HK
dc.identifier.spage687en_HK
dc.identifier.epage692en_HK
dc.identifier.isiWOS:000259716600037-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK

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