La0.99Co0.4Ni0.6O3−δ–Ce0.8Gd0.2O1.95 as composite cathode for solid oxide fuel cells

Publication: Research - peer-reviewConference article – Annual report year: 2011

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We have studied a new composite SOFC cathode consisting of LaCo0.4Ni0.6O3−δ (LCN60) and Ce0.9Gd0.1O1.95 (CGO). The polarisation resistance (RP) at 750°C and OCV was measured to 0.05±0.01Ωcm2 and the activation energy was determined to be about 1eV. The impedance spectra were modelled with an EQC model consisting of a high frequency ZRQ circuit and a medium frequency Gerischer impedance, ZG. The resistance of ZG was found to decrease with approximately a factor of two as a consequence of infiltration of (La0.6Sr0.4)0.99CoO3 into the porous LCN60–CGO structure. RP of both infiltrated and non-infiltrated LCN60–CGO cathodes is substantially lower than that of LSM–YSZ and comparable with single phase LSC cathodes at low T due to its low EA. RP was also found to be stable at 750°C and OCV. The cathodes were integrated onto ScYSZ based anode supported cells which were measured to have an ASR of 0.16–0.18Ωcm2 at 750°C.
Original languageEnglish
JournalJournal of Power Sources
Publication date2011
Volume196
Issue17
Pages7237-7244
ISSN0378-7753
DOIs
StatePublished

Conference

Conference1st European Solid Oxide Fuel Cell Forum
CountrySwitzerland
CityLucerne
Period02/10/9406/10/94
CitationsWeb of Science® Times Cited: 7

Keywords

  • Solid Oxide Fuel Cells
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