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In the last years, the solid electrolyte fuel cells have been the subject of many researches, especially in order to remedy the problems relating to the environment. Although the solid electrolyte mostly used in industry, is the zirconium doped in yttrium, however a potential candidate can be the oxide of cerium non doped. Indeed this oxide presents, low-temperature, a conductivity higher than that of the zirconium oxide what should allow to lower the temperature of functioning of the electrochemical piles. Polycrystals have been elaborated of cerium oxide and cerium oxide pure non doped and studied the electrical behavior. [ABSTRACT FROM AUTHOR]