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First China-Japan Workshop on Solid Oxide Fuel Cells

Reactivity of LaNi0.6Fe0.4O3 With Samaria Doped Ceria

[+] Author and Article Information
Hajime Arai, Reiichi Chiba, Takeshi Komatsu, Himeko Orui, Satoshi Sugita, Yoshitaka Tabata, Kazuhiko Nozawa, Kimitaka Watanabe

NTT Energy and Environment Systems Laboratories,  NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan

Masayasu Arakawa1

NTT Energy and Environment Systems Laboratories,  NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan

Kazunori Sato

Material Science for Environment,  Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan

1

Present address: NTT Facilities Research Institute Inc., 3-9-11 Midori-cho, Musasino, Tokyo 180-0012, Japan.

J. Fuel Cell Sci. Technol 5(3), 031204 (May 23, 2008) (5 pages) doi:10.1115/1.2927765 History: Received July 27, 2007; Revised December 03, 2007; Published May 23, 2008

LaNi0.6Fe0.4O3 (LNF) is one of the promising cathodes for solid oxide fuel cells, but reacts with a zirconia-based electrolyte. To prevent this undesirable reaction, a ceria phase has been introduced in between the LNF cathode and electrolyte. On the other hand, the ceria phase itself could react with lanthanum-based perovskite oxides. We examined the reactivity of LNF and Ce0.8Sm0.2O2δ (samaria doped ceria (SDC)) in this study. The mixtures of LNF and SDC were sintered at temperatures between 1123K and 1623K and the resultants were analyzed by X-ray diffraction together with the Rietveld analysis. We also measured the activity of electrochemical cells with a LNF-SDC composite layer in between the LNF cathode and zirconia-based electrolyte. The lattice parameters of each phase are clarified and a possible reaction scheme is proposed. The cell activity was high, but was influenced by the sintering temperature of the composite. Both chemical stability and physical property of the cathode can affect the cell activity.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

XRD patterns of LNF-SDC mixtures sintered at (a) 1123K, (b) 1223K, (c) 1323K, (d) 1423K, (e) 1523K, and (f) 1623K. Filled circles, open circles, and open squares denote the perovskite phase, ceria phase, and NiO, respectively.

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Figure 2

Results of Rietveld refinement for samples sintered at (a) 1123K and (b) 1623K. Closed circles, line, and crosses (shown in the upper part of the figure) denote raw XRD pattern, refined XRD pattern, and the difference, respectively.

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Figure 3

Results of Rietveld refinement for samples sintered at 1623K assuming (a) hexagonal and (b) orthorhombic settings. Closed circles, line, and crosses (shown in the upper part of the figure) denote raw XRD pattern, refined XRD pattern, and the difference, respectively.

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Figure 4

Hexagonal lattice parameters a and c for perovskite phase as a function of sintering temperature

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Figure 5

Cubic lattice parameter a for ceria phase as a function of sintering temperature

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Figure 6

Weight ratio of perovskite phase (filled circles), ceria phase (open circles), and NiO (open squares) as a function of sintering temperature

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Figure 7

Cathode potential of the cells sintered at 1323K (filled circles), 1423K (open circles), and 1523K (open squares) as a function of current density. The operation temperature was 1073K.

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