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Polarization Resistances of (Ln1xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd x=0, 0.3, 0.5, 0.7, and 1) as Cathode Materials for Intermediate Temperature-operating Solid Oxide Fuel Cells

[+] Author and Article Information
Jung Hyun Kim, Seung-Wook Baek

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 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, 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), 034503 (May 12, 2009) (5 pages) doi:10.1115/1.3006310 History: Received June 17, 2007; Revised December 03, 2007; Published May 12, 2009

This study focuses on cathode performances of (Ln1xSrx)CoO3δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1) for intermediate temperature-operating solid oxide fuel cells (IT-SOFCs, 600800°C). (Ln1xSrx)CoO3δ powders as cathode materials for IT-SOFC, which can be operated between 600°C and 800°C were synthesized by the glycine-nitrate-process (GNP) method. The impedance spectroscopy method was used to investigate area specific resistance (ASR) and electrochemical properties of (Ln1xSrx)CoO3δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1). Pr0.5Sr0.5CoO3δ and Pr0.3Sr0.7CoO3δ showed to 0.15Ωcm2 of ASR at 700°C and Nd0.5Sr0.5CoO3δ to 0.14Ωcm2 at 700°C. Sm0.5Sr0.5CoO3δ showed the lowest ASR values of 0.10Ωcm2 on 10% Gd-doped cerium oxide at 700°C.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Goldschmidt tolerance factors of (Ln1−xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1) according to the amount of strontium(x)

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Figure 2

SEM photographs of PSC55. ((a) and (b) are the PSC55 powders after GNP, and (c) and (d) are the PSC55 powder after calcination at 1250°C for 1 h in air)

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Figure 3

XRD measurements of (Ln1−xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd, x=0.5) and SrCoO3

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Figure 4

Enlarged XRD measurements of (Ln0.5Sr0.5)CoO3 (Ln=Pr, Nd, Sm, and Gd) and SrCoO3

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Figure 5

Relation of substitution of Sr and temperature in (Pr1−xSrx)CoO3 (x=0, 0.15, 0.3, 0.4 and 0.5) oxide system by Kostogloudis (19)

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Figure 6

ac impedance spectra for porous NSC55 cathode on CGO91 electrolyte at 500°C. The numbers indicate frequency logarithm.

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Figure 7

ac impedance spectra for porous NSC55 cathode on CGO91 electrolyte at 700°C. The numbers indicate frequency logarithm.

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Figure 8

ac impedance spectra for porous SSC55 cathode on CGO91 electrolyte at 700°C. The numbers indicates frequency logarithm.

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Figure 9

ASR results of (Ln1−xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1) from 500°C to 900°C

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Figure 10

Area specific resistance of (Ln0.5Sr0.5)CoO3 from 500°C to 900°C

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