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Experimental determination of effective conductivities in porous molten carbonate fuel cell electrodes
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0002-2268-5042
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
1998 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 44, no 2-3, 503-511 p.Article in journal (Refereed) Published
Abstract [en]

In this work an electrochemical impedance spectroscopy method fbr the determination of the effective conductivities of the pore electrolyte and electrode matrix in porous electrodes has been used. The technique has been employed on porous nickel oxide and lithium cobaltite cathodes partly flooded with lithium-potassium carbonate melt in cathode gas environment. The experimental results show that the effective conductivity of the pore electrolyte of a porous nickel oxide cathode is 0.9-2.2 Omega(-1) m(-1) at the most. If data are approximately corrected for the faradaic reaction the effective conductivity becomes 0.1-0.7 Omega(-1) m(-1). For the lithium cobaltite cathode the measured conductivity of the solid phase is similar to the data measured ex-situ. The effective conductivity of the pore electrolyte is 0.8 Omega(-1) m(-1), i.e. close to the results found for nickel oxide cathodes. The effective conductivity of the pore electrolyte calculated by means of a theoretical model is 0.5-3.5 Omega(-1) m(-1).

Place, publisher, year, edition, pages
1998. Vol. 44, no 2-3, 503-511 p.
Identifiers
URN: urn:nbn:se:kth:diva-12881ISI: 000076093200032OAI: oai:DiVA.org:kth-12881DiVA: diva2:319521
Note
QC 20100518Available from: 2010-05-18 Created: 2010-05-18 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Electrochemical performance of porous MCFC cathodes
Open this publication in new window or tab >>Electrochemical performance of porous MCFC cathodes
1997 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 1997. ix, 55 p.
Series
Trita-KET, ISSN 1104-3466
Keyword
molten carbonate fuel cell, MCFC cathode, LiCoO2, NiO, porous electrode, polarisation, performance, reaction mechanisms, conductivity
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-2473 (URN)99-2384406-4 (ISBN)
Public defence
1997-03-01, 00:00 (English)
Note
QC 20100511Available from: 2000-01-01 Created: 2000-01-01 Last updated: 2010-05-18Bibliographically approved

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Lagergren, CarinaLindbergh, Göran

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