Experimental determination of effective conductivities in porous molten carbonate fuel cell electrodes
1998 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 44, no 2-3, 503-511 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:kth:diva-12881ISI: 000076093200032OAI: oai:DiVA.org:kth-12881DiVA: diva2:319521
QC 201005182010-05-182010-05-182010-05-18Bibliographically approved