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Effect of Dy3+ on the Microstructure and Electrical Properties of Ce0.8 Sm0.2−x Dyx O1.9 (0 ≤ x ≤ 0.15) Electrolytes for IT-SOFC

[+] Author and Article Information
K. Park

Faculty of Nanotechnology and Advanced Materials Engineering,  Sejong University, Seoul 143-747, Koreakspark@sejong.ac.kr

H. K. Hwang

Faculty of Nanotechnology and Advanced Materials Engineering,  Sejong University, Seoul 143-747, Korea

J. Fuel Cell Sci. Technol 8(6), 061011 (Sep 27, 2011) (4 pages) doi:10.1115/1.4004464 History: Received January 27, 2011; Revised May 30, 2011; Accepted June 21, 2011; Published September 27, 2011; Online September 27, 2011

High-quality nanosized Ce0.8 Sm0.2-x Dyx O1.9 (0 ≤ x ≤ 0.15) powders were successfully synthesized by solution combustion method. Calcined Ce0.8 Sm0.2−x Dyx O1.9 (0 ≤ x ≤ 0.15) powders and sintered Ce0.8 Sm0.2−x Dyx O1.9 (0 ≤ x ≤ 0.15) pellets crystallized in the cubic fluorite structure. Dense and nanocrystalline Ce0.8 Sm0.2−x Dyx O1.9 electrolytes were fabricated, even at low sintering temperature (1300 °C). The microstructure and electrical property of the Ce0.8 Sm0.2−x Dyx O1.9 were discussed, depending on the Dy3+ content. The highest conductivity (0.053 S cm−1 at 800 °C) was obtained for Ce0.8 Sm0.17 Dy0.03 O1.9 .

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

FE-SEM images of the synthesized Ce0.8 Sm0.2 – x Dyx O1.9 with x = (a) 0, (b) 0.06, and (c) 0.15 (scale bar: 500 nm)

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Figure 2

TEM bright field images of the calcined Ce0.8 Sm0.2 − x Dyx O1.9 nanopowders with x = (a) 0.06 and (b) 0.15 (scale bar: 20 nm)

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Figure 3

XRD patterns of the calcined Ce0.8 Sm0.2 − x Dyx O1.9 powders with x = (a) 0, (b) 0.03, (c) 0.06, (d) 0.09, (e) 0.12, and (f) 0.15

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Figure 4

XRD patterns of the sintered Ce0.8 Sm0.2 − x Dyx O1.9 pellets with x = (a) 0, (b) 0.03, (c) 0.06, (d) 0.09, (e) 0.12, and (f) 0.15

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Figure 5

FE-SEM images of the sintered Ce0.8 Sm0.2 − x Dyx O1.9 pellets with x = (a) 0, (b) 0.03, (c) 0.09, and (d) 0.15 (scale bar: 1 μm)

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Figure 6

Relationship between ln(σT) and 1000T-1 for the Ce0.8 Sm0.2 − x Dyx O1.9 (0 ≤ x ≤ 0.15) electrolytes

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