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Research Papers

Cathode Properties of SmxSr1x(Co,Fe,Ni)O3δ/Sm0.2Ce0.8O1.9 Composite Material for Intermediate Temperature-Operating Solid Oxide Fuel Cell

[+] Author and Article Information
Seung-Wook Baek, Changbo Lee

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Guseong-Dong, Yuseong-Gu, Daejeon, 305-701, Republic of Korea

Joongmyeon Bae1

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Guseong-Dong, Yuseong-Gu, Daejeon, 305-701, Republic of Koreajmbae@kaist.ac.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(3), 031010 (May 14, 2009) (5 pages) doi:10.1115/1.3006308 History: Received June 18, 2007; Revised February 20, 2008; Published May 14, 2009

Perovskite-structured cathode material containing samarium (Sm) has been recognized as a promising electrode material due to its high electrocatalytic property for intermediate temperature-operating solid oxide fuel cell (IT-SOFC). This research investigated the optimized composition of SmxSr1x(Co,Fe,Ni)O3δ/Sm0.2Ce0.8O1.9 on the Sm0.2Ce0.8O1.9 electrolyte and the possible use of an optimized composite material for the IT-SOFC system. The electrochemical and thermal properties of SmxSr1x(Co,Fe,Ni)O3δ and its composite material with the Sm0.2Ce0.8O1.9 electrolyte were investigated in terms of area specific resistance (ASR) and thermal expansion coefficient at various temperature conditions. Durability of the selected materials was verified by thermal cycling and long-term degradation tests. Sm0.5Sr0.5CoO3δ and the Sm0.5Sr0.5CoO3δ/Sm0.2Ce0.8O1.9(6:4) composite cathode showed a very low ASR of 0.87Ωcm2 and 0.30Ωcm2 at 600°C, respectively. The composite type cathode for the Sm0.5Sr0.5CoO3δ material was more attractive due to its thermal expansion compatibility with neighboring cell components.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

XRD patterns of the prepared powders: (a) Sm0.5Sr0.5(Co,Fe)O3−δ and Sm0.2Ce0.8O1.9. (b) Sm0.5Sr0.5(Co,Ni)O3−δ. *Sm0.5Sr1.5CoO4−δ: spinel-structured reference powder.

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Figure 2

Area specific resistances according to the amount of x in SmxSr1−xCoO3−δ

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Figure 3

Area specific resistances according to the substitution of the B-site in Sm0.5Sr0.5B(Co,Fe,Ni)O3−δ

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Figure 4

Thermal expansion experimental results according to the substitution of B-site in Sm0.5Sr0.5B(Co,Fe,Ni)O3−δ

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Figure 5

Area specific resistances according to the amount of added SDC on SSC55

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Figure 6

Thermal expansion experimental results according to the amount of added SDC on SSC55

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Figure 7

Microstructure of (a) SSC55 and (b) SSC55/SDC(6:4)

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Figure 8

Thermal cycle comparison of the ASR for SSC55 and SSC55/SDC(6:4)

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Figure 9

Long-term performance test for SSC55/SDC(6:4) by impedance spectroscopy at 600°C

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