Mixed transport properties of Ce1-xSmxO2-x/2 system under fuel cell operating conditions
authors Perez-Coll, D; Aguadero, A; Nunez, P; Frade, JR
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Ceria; Mixed conductor; Fuel conversion; SOFC
keywords SOLID-OXIDE FUEL; CHEMICALLY-INDUCED STRESSES; DOPED CERIA ANODE; ELECTRONIC CONDUCTIVITY; ELECTROCHEMICAL PROPERTIES; DIRECT OXIDATION; ELECTROLYTES; CERAMICS; NONSTOICHIOMETRY; TEMPERATURE
abstract Ceria-samaria compositions were prepared by freeze-drying, yielding very homogeneous and fluorite single phase powders at temperatures as low as 375 degrees C. These powders were used to obtain dense ceramics by sintering at 1600 degrees C for 10 h. The mixed transport properties of these materials were characterized by impedance spectroscopy and the Hebb-Wagner ion-blocking method, at temperatures in the range 700-950 degrees C. The onset of n-type electronic conductivity was expressed as a function of oxygen partial pressure and temperature, and was found dependent on the Sm-content. Mixed transport properties were also analyzed for conditions in which the samples are exposed to fuels in a SOFC, either as electrolyte or component of cermet anodes. The degree of fuel conversion and corresponding changes in gas composition produce changes in the mixed transport properties of SOFC electrolytes, with emphasis on the fuel side. The mixed transport properties were also used to estimate open cell voltage as a function of fuel conversion. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2010
volume 35
issue 20
beginning page 11448
ending page 11455
digital object identifier (doi) 10.1016/j.ijhydene.2010.05.055
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000284443200071
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