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Issue 8, 2011
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Crystal chemistry and electrochemical properties of Ln(Sr,Ca)3(Fe,Co)3O10 intergrowth oxide cathodes for solid oxidefuel cells

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Abstract

Ln(Sr,Ca)3(Fe,Co)3O10 (Ln = La, Nd, and Gd) oxides crystallizing in a perovskite-related intergrowth structure have been synthesized and explored as new cathode materials for solid oxide fuel cells (SOFC). The crystal structures of the Ln(Sr,Ca)3(Fe,Co)3O10 samples could be refined based on the tetragonal space groupI4/mmm. The substitution of Co for Fe in LnSr3(Fe,Co)3O10 (Ln = La and Nd) increases the amount of oxygen loss on heating, thermal expansion coefficient (TEC), total electrical conductivity, and cathode performance in SOFC. In particular, the Ln = Nd samples exhibit superior cathode performances in SOFC compared to those obtained with the Ln = La or Gd samples in LnSr3(Fe,Co)3O10. Further improvement in the cathode performance and a decrease in the TEC value have been realized by a substitution of less electropositive Ca for Sr in NdSr3−yCayFe1.5Co1.5O10, demonstrating that NdSr2.5Ca0.5Fe1.5Co1.5O10 (NSCFC) is the optimum composition among the Ln(Sr,Ca)3(Fe,Co)3O10 samples investigated. The improved performance of NSCFC is attributed to the decreased lattice distortion in the perovskite layer, which is beneficial to enhance the oxide-ion conductivity.

Graphical abstract: Crystal chemistry and electrochemical properties of Ln(Sr,Ca)3(Fe,Co)3O10 intergrowth oxide cathodes for solid oxide fuel cells

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Publication details

The article was received on 26 Sep 2010, accepted on 29 Nov 2010 and first published on 24 Dec 2010


Article type: Paper
DOI: 10.1039/C0JM03230A
J. Mater. Chem., 2011,21, 2482-2488

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    Crystal chemistry and electrochemical properties of Ln(Sr,Ca)3(Fe,Co)3O10 intergrowth oxide cathodes for solid oxide fuel cells

    J.-H. Kim, K.-T. Lee, Y. N. Kim and A. Manthiram, J. Mater. Chem., 2011, 21, 2482
    DOI: 10.1039/C0JM03230A

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