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Investigation of Graded La2NiO4+ Cathodes to Improve SOFC Electrochemical Performance

Rieu, Mathilde and Sayers, R. and Laguna-Bercero, M. A. and Skinner, S. J. and Lenormand, Pascal and Ansart, Florence Investigation of Graded La2NiO4+ Cathodes to Improve SOFC Electrochemical Performance. (2010) Journal of The Electrochemical Society (JES), vol. 157 (n° 4). pp. B477-B480. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.3298439

Abstract

Mixed ionic and electronic conducting MIEC oxides are promising materials for use as cathodes in solid oxide fuel cells SOFCs due to their enhanced electrocatalytic activity compared with electronic conducting oxides. In this paper, the MIEC oxide La2NiO4+ was prepared by the sol-gel route. Graded cathodes were deposited onto yttria-stabilized zirconia YSZ pellets by dip-coating, and electrochemical impedance spectroscopy studies were performed to characterize the symmetrical cell performance. By adapting the slurries, cathode layers with different porosities and thicknesses were obtained. A ceria gadolinium oxide CGO barrier layer was introduced, avoiding insulating La2Zr2O7 phase formation and thus reducing resistance polarization of the cathode. A systematic correlation between microstructure, composition, and electrochemical performance of these cathodes has been performed. An improvement of the electrochemical performance has been demonstrated, and a reduction in the area specific resistance ASR by a factor of 4.5 has been achieved with a compact interlayer of La2NiO4+ between the dense electrolyte and the porous La2NiO4+ cathode layer. The lowest observed ASR of 0.11 cm2 at 800°C was obtained from a symmetrical cell composed of a YSZ electrolyte, a CGO interlayer, an intermediate compact La2NiO4+ layer, a porous La2NiO4+ electrode layer, and a current collection layer of platinum paste.

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://www.electrochem.org/ The original PDF of the article can be found at Journal of The Electrochemical Society website : http://scitation.aip.org/JES/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Imperial College of Science, Technology and Medicine (UNITED KINGDOM)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By:Nihad Lahdifi

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