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Article: An improved electrochemical model for the NH3 fed proton conducting solid oxide fuel cells at intermediate temperatures

TitleAn improved electrochemical model for the NH3 fed proton conducting solid oxide fuel cells at intermediate temperatures
Authors
KeywordsAmmonia catalytic decomposition
Ammonia fuel
Electrochemical model
Mass transfer
Proton conducting ceramics
Solid oxide fuel cell (SOFC)
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. 185 n. 1, p. 233-240 How to Cite?
AbstractAn improved electrochemical model is developed to study the ammonia fed solid oxide fuel cell based on proton conducting electrolyte (SOFC-H). Including the chemical reaction kinetics of NH3 catalytic thermal decomposition, the present model can be used to predict the performance of the NH3 fed SOFC-H at an intermediate temperature (i.e. 773 K). Comparison between the simulation results using the present model and experimental data from literature validates the accuracy of this model. Parametrical analyses reveal that at a high operating temperature (i.e. 1073 K), the NH3 fuel is completely decomposed to H2 and N2 within a very thin layer (30 μm) near the anode surface of an SOFC-H. It is also found that operating the NH3 fed SOFC-H at an intermediate temperature of 773 K is feasible due to sufficiently high rate of NH3 decomposition. However, further decreasing the temperature to 673 K is not recommended as less than 10% NH3 fuel can be decomposed to H2 and N2 in the SOFC-H. The effects of current density and electrode microstructure on the performance of the NH3 fed SOFC-H are also studied. It is found that increasing electrode porosity and pore size is beneficial to increase the partial pressure of H2 at the anode-electrolyte interface. The model developed in this paper can be extended to 2D or 3D models to study practical tubular or planar SOFCs. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/59003
ISSN
2015 Impact Factor: 6.333
2015 SCImago Journal Rankings: 2.008
ISI Accession Number ID
Funding AgencyGrant Number
CRCG of the University of Hong Kong
Funding Information:

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

References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorLeung, MKHen_HK
dc.date.accessioned2010-05-31T03:41:14Z-
dc.date.available2010-05-31T03:41:14Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Power Sources, 2008, v. 185 n. 1, p. 233-240en_HK
dc.identifier.issn0378-7753en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59003-
dc.description.abstractAn improved electrochemical model is developed to study the ammonia fed solid oxide fuel cell based on proton conducting electrolyte (SOFC-H). Including the chemical reaction kinetics of NH3 catalytic thermal decomposition, the present model can be used to predict the performance of the NH3 fed SOFC-H at an intermediate temperature (i.e. 773 K). Comparison between the simulation results using the present model and experimental data from literature validates the accuracy of this model. Parametrical analyses reveal that at a high operating temperature (i.e. 1073 K), the NH3 fuel is completely decomposed to H2 and N2 within a very thin layer (30 μm) near the anode surface of an SOFC-H. It is also found that operating the NH3 fed SOFC-H at an intermediate temperature of 773 K is feasible due to sufficiently high rate of NH3 decomposition. However, further decreasing the temperature to 673 K is not recommended as less than 10% NH3 fuel can be decomposed to H2 and N2 in the SOFC-H. The effects of current density and electrode microstructure on the performance of the NH3 fed SOFC-H are also studied. It is found that increasing electrode porosity and pore size is beneficial to increase the partial pressure of H2 at the anode-electrolyte interface. The model developed in this paper can be extended to 2D or 3D models to study practical tubular or planar SOFCs. © 2008 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.subjectAmmonia catalytic decompositionen_HK
dc.subjectAmmonia fuelen_HK
dc.subjectElectrochemical modelen_HK
dc.subjectMass transferen_HK
dc.subjectProton conducting ceramicsen_HK
dc.subjectSolid oxide fuel cell (SOFC)en_HK
dc.titleAn improved electrochemical model for the NH3 fed proton conducting solid oxide fuel cells at intermediate temperaturesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0378-7753&volume=185&spage=233&epage=240&date=2008&atitle=An+improved+electrochemical+model+for+the+NH3+fed+proton+conducting+solid+oxide+fuel+cells+at+intermediate+temperaturesen_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.jpowsour.2008.07.023en_HK
dc.identifier.scopuseid_2-s2.0-50949132837en_HK
dc.identifier.hkuros153390en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-50949132837&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume185en_HK
dc.identifier.issue1en_HK
dc.identifier.spage233en_HK
dc.identifier.epage240en_HK
dc.identifier.isiWOS:000259906600036-
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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