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Research Papers

Synthesis of Y0.2 ZrX Ce0.8−X O1.9 Electrolytes From the Sol-Gel Method for Intermediate Temperature URSOFC Application

[+] Author and Article Information
Guo-Bin Jung1

Ting-Chu Jao, Chia-Chen Yeh

Department of Mechanical Engineering,Fuel Cell Center,  Yuan Ze University, 135 Yuan-Tung Rd. Chung-Li, Taoyuan 320, Taiwan, R.O.C.

Ming-Hsien Huang, Wang-Shen Su

Department of Chemical Engineering,  National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, 807, Taiwan, R.O.C.

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(4), 041005 (Jun 15, 2012) (5 pages) doi:10.1115/1.4006472 History: Received August 10, 2011; Revised February 27, 2012; Published June 15, 2012; Online June 15, 2012

A series of Y0.2 Zrx Ce0.8−x O1.9 compounds (0 ≤ x ≤ 0.6) had been prepared by the modified sol-gel method and characterized by powder X-ray diffraction, thermo-gravimetric analysis, four-probe resistivity, and Vickers’s hardness studies. The gels from co-precipitation were treated with heated 1-octanol. All of the samples showed fluoride structure after calcined at 600 °C. Sintering the powders of Y0.2 Ce0.8 O1.9 and Y0.2 Zr0.6 Ce0.2 O1.9 at 1300 °C gave the relative density of 95.8% and 99%, respectively. 99% relative density could be obtained for all samples after sintering at 1500 °C. This study showed a much more improved result than that of the previous reports. The hardness was 13.7 GPa for the Y0.2 Zr0.6 Ce0.2 O1.9 pellet, which was twice greater than that for Y0.2 Ce0.8 O1.9 (7.1 GPa). Therefore, the mechanical properties could be improved by the addition of ZrO2 to Y0.2 Zrx Ce0.8−x O1.9 . At 800 °C, the electrical conductivity of Y0.2 Ce0.8 O1.9 and Y0.2 Zr0.6 Ce0.2 O1.9 were 3.3 × 10−2 S/cm and 5.5 × 10−3 S/cm, respectively. The conductivity was decreased by the addition of ZrO2 to Y0.2 Ce0.8 O1.9 . It showed that the conductivity and hardness of Y0.2 Zr0.2 Ce0.6 O1.9 were 1.2 × 10−2 S/cm and 9.6 GPa, respectively, at 800 °C and could be a better electrolyte candidate for “intermediate-temperature” unitized regenerative solid oxide fuel cells.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical TGA patterns for Y0.2 Zrx Ce0.8−x O1.9 (0 ≦ x ≦ 0.6)

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Figure 2

Typical DTA patterns for Y0.2 Zrx Ce0.8−x O1.9 (0 ≦ x ≦ 0.6)

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Figure 3

Crystallite size of Y0.2 Zrx Ce0.8−x O1.9 (0 ≦ x ≦ 0.6) as a function of heat-treatment temperature

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Figure 4

X-ray diffraction patterns of Y0.2 Zrx Ce0.8−x O1.9 after being sintered at 1500 ±C

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Figure 5

Increase of relative density with sintering temperature of Y0.2 Zrx Ce0.8−x O1.9 (0 ≦ x ≦ 0.6)

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Figure 6

SEM image of Y0.2 Zrx Ce0.8−x O1.9 powders at 600 ±C

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Figure 7

Vickers hardness of Y0.2 Zrx Ce0.8−x O1.9 (0 ≦ x ≦ 0.6) as a function of dopants content

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Figure 8

Arrhenius plots of the bulk conductivity for: ● Y0.2 Ce0.8 O1.9 , ▪ Y0.2 Zr0.4 Ce0.4 O1.9 , □ 20Y-ZrO2 , ▴ Y0.2 Zr0.2 Ce0.6 O1.9 ,♦Y0.2 Zr0.6 Ce0.2 O1.9 , and ○ 12Y-ZrO2 (32)

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Figure 9

Varation of the activation energies with the relative concentration of the dopants for the system Y0.2 Zrx Ce0.8−x O1.9

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