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Research Papers

La0.8Sr0.2Co1xMnxO3 Cathode and Its Application to Metal-Supported Solid Oxide Fuel Cells

[+] Author and Article Information
Changbo Lee

Department of Research and Development, Fuel Cell Division, POSCO Power Corporation, No. 13-9 Jukcheon-Ri, Hunghae-Eup, Buk-Gu, Pohang 791-941, Republic of Korealeecb@poscopower.co.kr

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

Jung Hyun Kim

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Koreakaist77@kaist.ac.kr

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 Koreabaeksw77@kaist.ac.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(2), 021022 (Jan 25, 2010) (8 pages) doi:10.1115/1.3182738 History: Received June 06, 2008; Revised December 16, 2008; Published January 25, 2010; Online January 25, 2010

Cathode properties of La0.8Sr0.2Co1xMnxO3 (LSCM) perovskite oxides were investigated for their application to metal-supported solid oxide fuel cells (SOFCs). La0.8Sr0.2Co0.4Mn0.6O3 (LSCM-8246) had the lowest impedance on Zr0.85Y0.15O2 (YSZ) electrolyte among various compositions because the properties of the cathodic reaction kinetics, thermal expansion compatibility, and chemical reactivity were optimized. A Ce0.9Gd0.1O2 (CGO) interlayer was introduced between LSCM and YSZ to inhibit the formation of resistive phases at the interface. The cathode impedance was decreased to about 1/3 of the noninterlayer samples. The study of the partial oxygen pressure dependence and activation energy of LSCM-8246 on CGO-layered YSZ showed that the ionization of the adsorbed oxygen is the rate-determining step of the cathode reaction at the general operation condition of SOFCs. Metal-supported single cell SOFCs with LSCM-8246 cathode were fabricated and characterized. The single cell impedance was much greater than values expected from the half cell test because the cathode in the single cell was sintered in situ during the measurement. The effect of cathode sintering was observed by measuring the current-voltage (I-V) curves and impedance spectra with time.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

XRD patterns of LSCM powders

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Figure 2

Scanning electron microscope (SEM) image of partial cross section of the symmetric half cell (LSCM-8246/CGO-91/YSZ/CGO-91/LSCM-8246)

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Figure 3

Temperature dependence of the ASR of LSCM cathodes on YSZ electrolyte

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Figure 4

XRD patterns of YSZ, LSM-82, and LSM-82/YSZ with firing temperature (◼: LSCM-8255, ◻: YSZ)

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Figure 5

XRD patterns of YSZ, LSCM-8255, and LSCM-8255/YSZ with firing temperature (◼: LSCM-8255, ◻: YSZ, ●: La2Zr2O7, ○: SrZrO3)

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Figure 6

Temperature dependence of the ASR of LSCM-8246 and LSC-82 cathodes on YSZ, CGO, and CGO-layered YSZ electrolyte

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Figure 7

Impedance spectra of LSCM-8246 on CGO-layered YSZ at 0.0002 atm in oxygen partial pressure

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Figure 8

Impedance spectra of LSCM-8246 on CGO-layered YSZ at 1 atm in oxygen partial pressure (electrolyte resistance reoriented)

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Figure 9

Impedance spectra of LSCM-8246 on CGO-layered YSZ at 700°C for various oxygen partial pressures of 0.0002 atm, 0.002 atm, 0.02 atm, 0.2 atm, and 1 atm (electrolyte resistance reoriented)

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Figure 10

Temperature dependence of ASR of LSCM-8246 on CGO-layered YSZ for various oxygen partial pressures

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Figure 11

I-V-P characteristic of metal-supported SOFC with time at 800°C

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Figure 12

I-V-P characteristic of metal-supported SOFC as a function of oxygen partial pressure at 800°C

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Figure 13

Impedance spectra of metal-supported SOFC as a function of oxygen partial pressure at 800°C

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Figure 14

Top views by SEM of (a) CGO interlayer and (b) LSCM-8246 on YSZ electrolyte

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Figure 15

Model for the impedance spectra

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Figure 16

ASR of LSCM-8246 on CGO-layered YSZ as functions of temperature and oxygen partial pressure with respect to impedance frequency

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