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Article: Parametric study of solid oxide fuel cell performance

TitleParametric study of solid oxide fuel cell performance
Authors
KeywordsActivation overpotential
Concentration overpotential
Electrochemical model
Ohmic overpotential
SOFC
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/enconman
Citation
Energy Conversion and Management, 2007, v. 48 n. 5, p. 1525-1535 How to Cite?
AbstractAn electrochemical model was developed to study the current-voltage (J-V) characteristics of a solid oxide fuel cell (SOFC). The Butler-Volmer equation, Fick's model and Ohm's law were used to determine the activation, concentration and ohmic overpotentials, respectively. One important feature of this model is that both the exchange current density and gas diffusion coefficients were dependent on the cell microstructures (porosity and pore size) and operational parameters (temperature, pressure and gas composition). The simulation results were compared with experimental data from the literature, and good agreement was obtained. The subsequent parametric modeling analyses determined how individual overpotentials were related to the geometric and operational parameters. It was found that there existed optimal values of electrode pore size and porosity for maximum cell performance. Both the activation and ohmic overpotentials decreased significantly with increasing temperature. However, the concentration overpotential was found to increase with increasing temperature. This unexpected phenomenon was caused by the reduced gas density at elevated temperature despite the increase in diffusion coefficient with increasing temperature. Besides, increasing the hydrogen content in the fuel stream and increasing the operating pressure were possible ways to enhance the SOFC power output. The parametric analyses provided insights in the operation of SOFCs and clarified some ambiguous understanding of SOFC overpotentials. The present model could also serve as a valuable tool for SOFC optimization design. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/75586
ISSN
2015 Impact Factor: 4.801
2015 SCImago Journal Rankings: 2.156
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:12:37Z-
dc.date.available2010-09-06T07:12:37Z-
dc.date.issued2007en_HK
dc.identifier.citationEnergy Conversion and Management, 2007, v. 48 n. 5, p. 1525-1535en_HK
dc.identifier.issn0196-8904en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75586-
dc.description.abstractAn electrochemical model was developed to study the current-voltage (J-V) characteristics of a solid oxide fuel cell (SOFC). The Butler-Volmer equation, Fick's model and Ohm's law were used to determine the activation, concentration and ohmic overpotentials, respectively. One important feature of this model is that both the exchange current density and gas diffusion coefficients were dependent on the cell microstructures (porosity and pore size) and operational parameters (temperature, pressure and gas composition). The simulation results were compared with experimental data from the literature, and good agreement was obtained. The subsequent parametric modeling analyses determined how individual overpotentials were related to the geometric and operational parameters. It was found that there existed optimal values of electrode pore size and porosity for maximum cell performance. Both the activation and ohmic overpotentials decreased significantly with increasing temperature. However, the concentration overpotential was found to increase with increasing temperature. This unexpected phenomenon was caused by the reduced gas density at elevated temperature despite the increase in diffusion coefficient with increasing temperature. Besides, increasing the hydrogen content in the fuel stream and increasing the operating pressure were possible ways to enhance the SOFC power output. The parametric analyses provided insights in the operation of SOFCs and clarified some ambiguous understanding of SOFC overpotentials. The present model could also serve as a valuable tool for SOFC optimization design. © 2007 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/enconmanen_HK
dc.relation.ispartofEnergy Conversion and Managementen_HK
dc.subjectActivation overpotentialen_HK
dc.subjectConcentration overpotentialen_HK
dc.subjectElectrochemical modelen_HK
dc.subjectOhmic overpotentialen_HK
dc.subjectSOFCen_HK
dc.titleParametric study of solid oxide fuel cell performanceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0196-8904&volume=48&spage=1525&epage=1535&date=2007&atitle=Parametric+study+of+solid+oxide+fuel+cell+performanceen_HK
dc.identifier.emailLeung, MKH: mkhleung@hkucc.hku.hken_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.enconman.2006.11.016en_HK
dc.identifier.scopuseid_2-s2.0-33947320623en_HK
dc.identifier.hkuros132226en_HK
dc.identifier.hkuros142195-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33947320623&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume48en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1525en_HK
dc.identifier.epage1535en_HK
dc.identifier.isiWOS:000245957800013-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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