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Current-voltage characteristics of fuel cells with ceria-based electrolytes

Book ·
OSTI ID:242563
; ;  [1]
  1. Swiss Federal Inst. of Technology, Zuerich (Switzerland)
Dense electrolyte membranes with a thickness of 200 {micro}m have been prepared from ceria solid solutions with Gd{sub 2}O{sub 3}, Sm{sub 2}O{sub 3} and CaO by tape casting. Electrochemical properties of CeO{sub 2}-based fuel cells have been studied in the temperature range from 600 to 800 C. The electrolytes exhibit an ionic conductivity of 3--5 S/m at 700 C and mechanical stability in oxidizing as well as in reducing atmospheres. Power densities exceeding 350 mW/cm{sup 2} at 750 C are possible in CeO{sub 2}-based fuel cells with perovskite cathodes and Ni-cermet anodes. The mixed ionic/electronic conductivity of ceria electrolytes and its influence on current-voltage characteristics under fuel cell operating conditions are discussed.
OSTI ID:
242563
Report Number(s):
CONF-950683--; ISBN 1-56677-095-5
Country of Publication:
United States
Language:
English