Preparation, thermal expansion, chemical compatibility, electrical conductivity and polarization of A(2)-alpha A'alpha MO4 (A = Pr, Sm; A' = Sr; M = Mn, Ni; alpha = 0.3, 0.6) as a new cathode for SOFC

Nie HW; Wen TL; Wang SR; Wang YS; Guth U; Vashook V

Solid State Ionics, Vol.177, No.19-25, 1929-1932, 2006

DOI10.1016/j.ssi.2006.01.003 Export Citation

Preparation, thermal expansion, chemical compatibility, electrical conductivity and polarization of A(2)-alpha A'alpha MO4 (A = Pr, Sm; A' = Sr; M = Mn, Ni; alpha = 0.3, 0.6) as a new cathode for SOFC

Nie HW, Wen TL, Wang SR, Wang YS, Guth U, Vashook V

A(2-alpha)A'alpha MO4 (A=Pr, Sm, A'=Sr, M=Ni, Mn) with K2NiF4-type structure were synthesized by solid reaction. Their chemical stability, electrical conductivity and thermal expansion behavior as well as cathodic polarization were investigated in relation to the cathode of SOFC. The results showed that A(2-alpha)A'alpha MO4 exhibited a low reactivity with yttria stabilized zirconia (YSZ) electrolyte. The thermal expansion coefficient (TEC) values were changed with the ionic radius of A. The specific conductivities of the nickelates were higher than those of manganites. While the nickelates showed a lower cathodic polarization in comparison with manganites. (c) 2006 Elsevier B.V. All rights reserved.

Keywords:cathode;perovskite-like structure;electrical conductivity;chemical compatibility