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Preparation and characterization of lead ruthenate based composite cathodes for SOFC applications

Published online by Cambridge University Press:  01 February 2011

Vincenzo Esposito ,
Enrico Traversa  and
Eric D. Wachsman
Vincenzo Esposito
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, U.S.A.
Enrico Traversa
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy
Eric D. Wachsman
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, U.S.A.
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Abstract

Nanometric pyrochlore lead ruthenate (Pb2Ru2O6.5) powders were prepared using a new chemical route as a possible candidate for cathode materials in solid oxide fuel cells (SOFCs). Pb2Ru2O6.5 was mixed with yttria-stabilized zirconia (YSZ) and erbia-stabilized bismuth oxide (ESB) to fabricate porous composite electrodes. Pure pyrochlore or composite electrodes were deposited as thick films onto YSZ and ESB electrolytes. Powders and films were analyzed using X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FE-SEM). Electrochemical features of the electrodes were investigated using electrochemical impedance spectroscopy (EIS) measurements at different temperatures in air for symmetric cells. The composite electrodes were compared to single Pb2Ru2O6.5 phase electrodes to evaluate the effect on polarization of the addition of the pure ionic conductor phase in the electrodes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K8.10
Copyright
Copyright © Materials Research Society 2005

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