Properties of nonstoichiometric Pr0.6-xSr0.4MnO3 as the cathodes of SOFCs

A series of samples Pr0.6-xSr0.4MnO3 (x = 0, 0.01, 0.05, 0.1, 0.15, 0.2) we re synthesized by a solid state reaction method. Pr deficiency at the A sit e has a great effect on the properties of Pr0.6-xSr0.4MnO3 as the cathode o f SOFCs (solid oxide fuel cells). Compared to the commonly used La0.6Sr0.4M nO3 and La0.55Sr0.4MnO3 cathode, Pr0.6-xSr0.4MnO3 is better in the properti es of conductivity, overpotential and impedance. In all the samples, the on e with x = 0.05, Pr0.55Sr0.4MnO3, revealed the best performance in the meas ured temperature range. (C) 2000 Elsevier Science B.V. All rights reserved.