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Article: Modeling of electrochemistry and heat/mass transfer in a tubular solid oxide steam electrolyzer for hydrogen production

TitleModeling of electrochemistry and heat/mass transfer in a tubular solid oxide steam electrolyzer for hydrogen production
Authors
KeywordsElectrochemistry
Heat transfer
Mass transfer
Solid oxide steam electrolyzer (SOSE)
Tubular cells
Issue Date2008
Citation
Chemical Engineering And Technology, 2008, v. 31 n. 9, p. 1319-1327 How to Cite?
AbstractA finite-volume based mathematical model has been developed for modeling hydrogen production by a tubular cell of solid oxide steam electrolyzer (SOSE), taking into account the electrochemical reactions and heat/mass transfer effects. The model is composed of three systems of nonlinear equations that govern the electric current density, energy balance in the solid SOSE cell, and energy balance in the flow of steam and hydrogen. The simulated hydrogen production rate proportional to the applied potential agreed well with the experimental measurements published in the literature. The intermediate modeling results indicated that the activation effect dominate the overall cell overpotential due to low exchange current density through the SOSE cell electrodes. Thus, higher electrode activity was identified as an important factor for enhancing cell performance. Parametric modeling analyses were conducted to gain better understanding of the SOSE characteristics. It was found that low-temperature gas intake would cause a high temperature gradient in the tubular cell material at the inlet, possibly leading to a thermal expansion problem. The risk could be reduced by increasing the gas inlet temperature. It was also found that energy-efficient SOSE hydrogen production can be achieved by reducing the hydrogen content in the steam intake and regulating the steam intake flow rate to an optimum that minimizes the overall electrical and thermal requirements. More parametric modeling results are discussed in this paper. The tubular SOSE cell model developed in this study can easily be expanded to accomplish tubular SOSE stack analysis for comprehensive system design optimization. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Persistent Identifierhttp://hdl.handle.net/10722/59082
ISSN
2015 Impact Factor: 2.385
2015 SCImago Journal Rankings: 0.633
ISI Accession Number ID
Funding AgencyGrant Number
Council of the Hong Kong Special Administrative Region, ChinaHKU 7150/05E
Funding Information:

The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (HKU 7150/05E).

References
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DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-05-31T03:42:34Z-
dc.date.available2010-05-31T03:42:34Z-
dc.date.issued2008en_HK
dc.identifier.citationChemical Engineering And Technology, 2008, v. 31 n. 9, p. 1319-1327en_HK
dc.identifier.issn0930-7516en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59082-
dc.description.abstractA finite-volume based mathematical model has been developed for modeling hydrogen production by a tubular cell of solid oxide steam electrolyzer (SOSE), taking into account the electrochemical reactions and heat/mass transfer effects. The model is composed of three systems of nonlinear equations that govern the electric current density, energy balance in the solid SOSE cell, and energy balance in the flow of steam and hydrogen. The simulated hydrogen production rate proportional to the applied potential agreed well with the experimental measurements published in the literature. The intermediate modeling results indicated that the activation effect dominate the overall cell overpotential due to low exchange current density through the SOSE cell electrodes. Thus, higher electrode activity was identified as an important factor for enhancing cell performance. Parametric modeling analyses were conducted to gain better understanding of the SOSE characteristics. It was found that low-temperature gas intake would cause a high temperature gradient in the tubular cell material at the inlet, possibly leading to a thermal expansion problem. The risk could be reduced by increasing the gas inlet temperature. It was also found that energy-efficient SOSE hydrogen production can be achieved by reducing the hydrogen content in the steam intake and regulating the steam intake flow rate to an optimum that minimizes the overall electrical and thermal requirements. More parametric modeling results are discussed in this paper. The tubular SOSE cell model developed in this study can easily be expanded to accomplish tubular SOSE stack analysis for comprehensive system design optimization. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.en_HK
dc.languageengen_HK
dc.relation.ispartofChemical Engineering and Technologyen_HK
dc.subjectElectrochemistryen_HK
dc.subjectHeat transferen_HK
dc.subjectMass transferen_HK
dc.subjectSolid oxide steam electrolyzer (SOSE)en_HK
dc.subjectTubular cellsen_HK
dc.titleModeling of electrochemistry and heat/mass transfer in a tubular solid oxide steam electrolyzer for hydrogen productionen_HK
dc.typeArticleen_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.doi10.1002/ceat.200800104en_HK
dc.identifier.scopuseid_2-s2.0-53249140671en_HK
dc.identifier.hkuros155291en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53249140671&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume31en_HK
dc.identifier.issue9en_HK
dc.identifier.spage1319en_HK
dc.identifier.epage1327en_HK
dc.identifier.isiWOS:000259522900012-
dc.publisher.placeGermanyen_HK
dc.relation.projectPhotocatalytic production of clean and renewable hydrogen fuel-
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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