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Research Papers

Degradation of Solid Oxide Fuel Cell Cathodes Accelerated at a High Water Vapor Concentration

[+] Author and Article Information
S. H. Kim

Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan; Department of Ceramic Engineering, Hanyang University, Seoul 133-791, Korea; Battery Research Center, KIST, Seoul 130-650, Korea

K. B. Shim

Department of Ceramic Engineering, Hanyang University, Seoul 133-791, Korea

C. S. Kim

Battery Research Center, KIST, Seoul 130-650, Korea

J. T. Chou, T. Oshima, Y. Shiratori, K. Ito

Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan

K. Sasaki1

Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japansasaki@mech.kyushu-u.ac.jp

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(2), 021011 (Jan 11, 2010) (6 pages) doi:10.1115/1.3117608 History: Received September 16, 2007; Revised January 21, 2009; Published January 11, 2010; Online January 11, 2010

The influence of water vapor in air on power generation characteristic of solid oxide fuel cells was analyzed by measuring cell voltage at a constant current density, as a function of water vapor concentration at 800°C and 1000°C. Cell voltage change was negligible at 1000°C, while considerable voltage drop was observed at 800°C accelerated at high water vapor concentrations of 20wt% and 40wt%. It is considered that La2O3 formed on the (La0.8Sr0.2)0.98MnO3 surface, which is assumed to be the reason for a large voltage drop.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of the experimental setup for electrochemical characterizations

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Figure 2

Water vapor concentration dependence of cell voltage at 200 mA/cm2 measured at (a) 800°C and (b) 1000°C for the cells with ScSZ electrolytes

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Figure 3

Water vapor concentration dependence of cell voltage drop (a) at 800°C for 2.5 h and (b) at 1000°C for 5 h at 200 mA/cm2 for the cells with ScSZ electrolytes

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Figure 4

Impedance spectra for the cell measured at open circuit voltage (OCV) before and after 5 h of operation cell test at 200 mA/cm2 in air with the specific humidities (dry air, air containing water vapor of 40%) at 800°C

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Figure 6

Micrographs of mixture of 50 wt %(La0.8Sr0.2)0.98MnO3 (LSM) and 50 wt % ScSZ (10 mol %Sc2O3−1 mol %CeO2–ZrO2) cathodes, after electrochemical measurements for 5 h (200 mA/cm2, 800°C) using (a) dry air and (b) air containing water vapor of 40%

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Figure 7

La–O–H stability diagram in thermodynamic equilibrium at (a) 800°C and (b) 1000°C

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Figure 8

The O 1s core level XP spectra of (La0.8Sr0.2)0.98MnO3 annealed in (a) dry air, (b) air containing water vapor of 20%, and (c) air containing water vapor of 40%

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Figure 9

High resolution TEM image of LSM tested under the flow of 40% wet air at 800°C

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Figure 5

FESEM micrographs of (La0.8Sr0.2)0.98MnO3 cathodes after electrochemical measurements for 5 h (200 mA/cm2, 800°C) using (a) dry air, (b) air containing water vapor of 20%, and (c) air containing water vapor of 40%

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