Gd(1-x)A(x)Co(1-y)Mn(y)O(3) (A = Sr, Ca) as a cathode for the SOFC

Abstract

The Gd(1-x)A(x)Co(1-y)Mn(y)O(3) (A = Sr, Ca) system was examined as an electrode for use in a solid oxide fuel cell, Particular compositions displayed reasonable performances of electrical conductivity and cathodic polarisation (using an 8 mol% yttria-stabilised zirconia (YSZ) electrolyte system). Mn rich compositions showed thermal expansion compatibility with the YSZ electrolyte. Reactivity with YSZ revealed only small amounts of Gd2Zr2O7 formation resulting after annealing at 1000 degrees C, with higher annealing temperatures allowing dissolution of the unstable pyrochlore, into the YSZ lattice, SrZrO3 formation was noted at lower temperatures for high Go-containing compositions, with reaction occurring at higher temperatures for compositions containing even less Co, (C) 1999 Elsevier Science B.V. All rights reserved.