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Article: Mathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production

TitleMathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production
Authors
KeywordsElectrochemical model
Functionally graded materials
Multi-component mass transfer
Porous media
SOSE
Thiele modulus
Wagner number
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/electacta
Citation
Electrochimica Acta, 2007, v. 52 n. 24, p. 6707-6718 How to Cite?
AbstractA mathematical model was developed to simulate the coupled transport/electrochemical reaction phenomena in a solid oxide steam electrolyzer (SOSE) at the micro-scale level. Ohm's law, dusty gas model (DGM), Darcy's law, and the generalized Butler Volmer equation were employed to determine the transport of electronic/ionic charges and gas species as well as the electrochemical reactions. Parametric analyses were performed to investigate the effects of operating parameters and micro-structural parameters on SOSE potential. The results substantiated the fact that SOSE potential could be effectively decreased by increasing the operating temperature. In addition, higher steam molar fraction would enhance the operation of SOSE with lower potential. The effect of particle sizes on SOSE potential was studied with due consideration on the SOSE activation and concentration overpotentials. Optimal particle sizes that could minimize the SOSE potential were obtained. It was also found that decreasing electrode porosity could monotonically decrease the SOSE potential. Besides, optimal values of volumetric fraction of electronic particles were found to minimize electrode total overpotentials. In order to optimize electrode microstructure to minimize SOSE electricity consumption, the concept of "functionally graded materials (FGM)" was introduced to lower the SOSE potential. The advanced design of particle size graded SOSE was found effective for minimizing electrical energy consumption resulting in efficient SOSE hydrogen production. The micro-scale model was capable of predicting SOSE hydrogen production performance and would be a useful tool for design optimization. © 2007.
Persistent Identifierhttp://hdl.handle.net/10722/75591
ISSN
2015 Impact Factor: 4.803
2015 SCImago Journal Rankings: 1.391
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:12:40Z-
dc.date.available2010-09-06T07:12:40Z-
dc.date.issued2007en_HK
dc.identifier.citationElectrochimica Acta, 2007, v. 52 n. 24, p. 6707-6718en_HK
dc.identifier.issn0013-4686en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75591-
dc.description.abstractA mathematical model was developed to simulate the coupled transport/electrochemical reaction phenomena in a solid oxide steam electrolyzer (SOSE) at the micro-scale level. Ohm's law, dusty gas model (DGM), Darcy's law, and the generalized Butler Volmer equation were employed to determine the transport of electronic/ionic charges and gas species as well as the electrochemical reactions. Parametric analyses were performed to investigate the effects of operating parameters and micro-structural parameters on SOSE potential. The results substantiated the fact that SOSE potential could be effectively decreased by increasing the operating temperature. In addition, higher steam molar fraction would enhance the operation of SOSE with lower potential. The effect of particle sizes on SOSE potential was studied with due consideration on the SOSE activation and concentration overpotentials. Optimal particle sizes that could minimize the SOSE potential were obtained. It was also found that decreasing electrode porosity could monotonically decrease the SOSE potential. Besides, optimal values of volumetric fraction of electronic particles were found to minimize electrode total overpotentials. In order to optimize electrode microstructure to minimize SOSE electricity consumption, the concept of "functionally graded materials (FGM)" was introduced to lower the SOSE potential. The advanced design of particle size graded SOSE was found effective for minimizing electrical energy consumption resulting in efficient SOSE hydrogen production. The micro-scale model was capable of predicting SOSE hydrogen production performance and would be a useful tool for design optimization. © 2007.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/electactaen_HK
dc.relation.ispartofElectrochimica Actaen_HK
dc.subjectElectrochemical modelen_HK
dc.subjectFunctionally graded materialsen_HK
dc.subjectMulti-component mass transferen_HK
dc.subjectPorous mediaen_HK
dc.subjectSOSEen_HK
dc.subjectThiele modulusen_HK
dc.subjectWagner numberen_HK
dc.titleMathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen productionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0013-4686&volume=52&spage=6707&epage=6718&date=2007&atitle=Mathematical+modeling+of+the+coupled+transport+and+electrochemical+reactions+in+solid+oxide+steam+electrolyzer+for+hydrogen+productionen_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.electacta.2007.04.084en_HK
dc.identifier.scopuseid_2-s2.0-34447109590en_HK
dc.identifier.hkuros142198en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34447109590&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume52en_HK
dc.identifier.issue24en_HK
dc.identifier.spage6707en_HK
dc.identifier.epage6718en_HK
dc.identifier.isiWOS:000248783300016-
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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