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Article: Electrochemical modeling and parametric study of methane fed solid oxide fuel cells

TitleElectrochemical modeling and parametric study of methane fed solid oxide fuel cells
Authors
KeywordsMathematical modeling
Methane fuel
Methane steam reforming
Multi-component mass transfer
Porous media
SOFC
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/enconman
Citation
Energy Conversion And Management, 2009, v. 50 n. 2, p. 268-278 How to Cite?
AbstractA mathematical model was developed to study the performance of methane (CH4) fed solid oxide fuel cells (SOFCs) considering the direct internal methane steam reforming (MSR) and water gas shift reaction (WGSR). An important feature of this model is that the effects of electrode structural parameters on both the exchange current density and gas diffusion coefficients are fully taken into consideration. The simulation results agreed well with literature data and thus validated the present model. Parametric analyses showed that all the overpotentials decreased with increasing temperature. This finding is different from previous analyses on hydrogen (H2) fed SOFCs, in which the concentration overpotential is found slightly increasing with increasing temperature. This interesting phenomenon for CH4 fed SOFCs can be explained that the rate of MSR and WGSR increases with increasing temperature, leading to high rate of H2 production inside the porous anode and a high molar ratio of H2 to H2O. More simulation results were conducted to investigate the electrode's microstructural effects on the performance of CH4 fed SOFCs. It is found that increasing electrode porosity or pore size decreases concentration overpotential but increases activation overpotential of CH4 fed SOFCs. At low current densities, low porosity and pore size are desirable to reduce the electrode total overpotentials as concentration overpotential is insignificant compared with activation overpotential. At high current densities, the total overpotentials can be minimized at optimal porosities and pore sizes. In order to further improve the performance of CH4 fed SOFCs, advanced electrodes with porosity graded and pore size graded structures are evaluated. It was found that both porosity grading and pore size grading were effective to increase the SOFC working potential due to reduced concentration overpotentials. The present study provided better understanding on the coupled transport and chemical reactions (i.e. MSR and WGSR) at the porous electrodes. The model developed can be used to conduct more analyses for design optimizations. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/59011
ISSN
2015 Impact Factor: 4.801
2015 SCImago Journal Rankings: 2.156
ISI Accession Number ID
Funding AgencyGrant Number
University of Hong Kong
Research Grants Council of Hong Kong, PR ChinaHKU7150/05E
Funding Information:

The authors would like to thank the financial support by the CRCG of the University of Hong Kong and the Research Grants Council of Hong Kong, PR China (HKU7150/05E).

References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorLeung, MKHen_HK
dc.date.accessioned2010-05-31T03:41:22Z-
dc.date.available2010-05-31T03:41:22Z-
dc.date.issued2009en_HK
dc.identifier.citationEnergy Conversion And Management, 2009, v. 50 n. 2, p. 268-278en_HK
dc.identifier.issn0196-8904en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59011-
dc.description.abstractA mathematical model was developed to study the performance of methane (CH4) fed solid oxide fuel cells (SOFCs) considering the direct internal methane steam reforming (MSR) and water gas shift reaction (WGSR). An important feature of this model is that the effects of electrode structural parameters on both the exchange current density and gas diffusion coefficients are fully taken into consideration. The simulation results agreed well with literature data and thus validated the present model. Parametric analyses showed that all the overpotentials decreased with increasing temperature. This finding is different from previous analyses on hydrogen (H2) fed SOFCs, in which the concentration overpotential is found slightly increasing with increasing temperature. This interesting phenomenon for CH4 fed SOFCs can be explained that the rate of MSR and WGSR increases with increasing temperature, leading to high rate of H2 production inside the porous anode and a high molar ratio of H2 to H2O. More simulation results were conducted to investigate the electrode's microstructural effects on the performance of CH4 fed SOFCs. It is found that increasing electrode porosity or pore size decreases concentration overpotential but increases activation overpotential of CH4 fed SOFCs. At low current densities, low porosity and pore size are desirable to reduce the electrode total overpotentials as concentration overpotential is insignificant compared with activation overpotential. At high current densities, the total overpotentials can be minimized at optimal porosities and pore sizes. In order to further improve the performance of CH4 fed SOFCs, advanced electrodes with porosity graded and pore size graded structures are evaluated. It was found that both porosity grading and pore size grading were effective to increase the SOFC working potential due to reduced concentration overpotentials. The present study provided better understanding on the coupled transport and chemical reactions (i.e. MSR and WGSR) at the porous electrodes. The model developed can be used to conduct more analyses for design optimizations. © 2008 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.subjectMathematical modelingen_HK
dc.subjectMethane fuelen_HK
dc.subjectMethane steam reformingen_HK
dc.subjectMulti-component mass transferen_HK
dc.subjectPorous mediaen_HK
dc.subjectSOFCen_HK
dc.titleElectrochemical modeling and parametric study of methane fed solid oxide fuel cellsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0196-8904&volume=50&spage=268&epage=278&date=2009&atitle=Electrochemical+modeling+and+parametric+study+of+methane+fed+solid+oxide+fuel+cellsen_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.enconman.2008.09.028en_HK
dc.identifier.scopuseid_2-s2.0-56349157006en_HK
dc.identifier.hkuros154519en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-56349157006&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume50en_HK
dc.identifier.issue2en_HK
dc.identifier.spage268en_HK
dc.identifier.epage278en_HK
dc.identifier.isiWOS:000262212600008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK

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