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; A. Manthiram

doi:10.1039/c0jm03230a

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
, A. Manthiram^*

^*Corresponding author for this work

Electronic Materials Engineering

University of Texas at Austin

Research output: Contribution to journal › Journal article › peer-review

28 Scopus citations

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 group I4/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 NdSr _3-yCa_yFe_1.5Co_1.5O₁₀, demonstrating that NdSr_2.5Ca_0.5Fe_1.5Co _1.5O₁₀ (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.

Original language	English
Pages (from-to)	2482-2488
Number of pages	7
Journal	Journal of Materials Chemistry
Volume	21
Issue number	8
DOIs	https://doi.org/10.1039/c0jm03230a
State	Published - 2011.02.28

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This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Chemistry

Access to Document

10.1039/c0jm03230a

Cite this

@article{cc056e75bba6456e93a7db2abf4fadad,

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

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 group I4/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 NdSr 3-yCayFe1.5Co1.5O10, demonstrating that NdSr2.5Ca0.5Fe1.5Co 1.5O10 (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.",

author = "Kim, \{J. H.\} and Lee, \{K. T.\} and Kim, \{Y. N.\} and A. Manthiram",

year = "2011",

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doi = "10.1039/c0jm03230a",

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journal = "Journal of Materials Chemistry",

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TY - JOUR

T1 - Crystal chemistry and electrochemical properties of Ln(Sr,Ca) 3(Fe,Co)3O10 intergrowth oxide cathodes for solid oxide fuel cells

AU - Kim, J. H.

AU - Lee, K. T.

AU - Kim, Y. N.

AU - Manthiram, A.

PY - 2011/2/28

Y1 - 2011/2/28

N2 - 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 group I4/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 NdSr 3-yCayFe1.5Co1.5O10, demonstrating that NdSr2.5Ca0.5Fe1.5Co 1.5O10 (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.

AB - 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 group I4/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 NdSr 3-yCayFe1.5Co1.5O10, demonstrating that NdSr2.5Ca0.5Fe1.5Co 1.5O10 (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.

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