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Mathematical modelling of the MCFC cathode: On the linear polarisation of the NiO cathode
KTH, Tidigare Institutioner                               , Kemiteknik.
KTH, Tidigare Institutioner                               , Kemiteknik.ORCID-id: 0000-0002-2268-5042
KTH, Tidigare Institutioner                               , Kemiteknik.
1997 (engelsk)Inngår i: Journal of Electroanalytical Chemistry, ISSN 0022-0728, E-ISSN 1873-2569, Vol. 432, nr 1-2, s. 121-128Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Experimental polarisation curves for the porous lithiated NiO cathode used in molten carbonate fuel cells very often exhibit a linear shape over a wide potential range. It is shown by means of mathematical modelling that this linear behaviour can be explained by the interplay of intrinsic electrode kinetics, diffusion of electroactive species through an electrolyte film and the effective ohmic resistance of the pore electrolyte, providing that the cathodic transfer coefficient has a value of about 1.5. In contrast, with the generally assumed value of 0.5 of this transfer coefficient and with reasonable values of the effective electrolyte conductivity, predicted polarisation curves will always bend downwards over the overvoltage region of interest. The evolution of the polarisation curves with increasing electrolyte fill can be simulated by a model according to which the electroactive surface area becomes gradually blocked with the increasing amount of electrolyte.

sted, utgiver, år, opplag, sider
1997. Vol. 432, nr 1-2, s. 121-128
Emneord [en]
fuel cell, MCFC, gas diffusion electrodes, mathematical modelling, oxygen reduction, CARBONATE FUEL-CELLS, MOLTEN, REDUCTION, OXYGEN, ELECTRODE, PERFORMANCE, ANODE
Identifikatorer
URN: urn:nbn:se:kth:diva-12880ISI: A1997YC70200014OAI: oai:DiVA.org:kth-12880DiVA, id: diva2:319516
Merknad
QC 20100518Tilgjengelig fra: 2010-05-18 Laget: 2010-05-18 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Electrochemical performance of porous MCFC cathodes
Åpne denne publikasjonen i ny fane eller vindu >>Electrochemical performance of porous MCFC cathodes
1997 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 1997. s. ix, 55
Serie
Trita-KET, ISSN 1104-3466
Emneord
molten carbonate fuel cell, MCFC cathode, LiCoO2, NiO, porous electrode, polarisation, performance, reaction mechanisms, conductivity
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-2473 (URN)99-2384406-4 (ISBN)
Disputas
1997-03-01, 00:00 (engelsk)
Merknad
QC 20100511Tilgjengelig fra: 2000-01-01 Laget: 2000-01-01 Sist oppdatert: 2010-05-18bibliografisk kontrollert

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