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Technical Briefs

Design and Preparation of SOFC Unit Cells Using Scandia-Stabilized Zirconia Electrolyte for Intermediate Temperature Operation

[+] Author and Article Information
Sung-Chul Park, Jong-Jin Lee, Seung-Ho Lee, Jooho Moon

School of Advanced Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea

Sang-Hoon Hyun1

School of Advanced Materials Science and Engineering, Yonsei University, Seoul 120-749, Koreaprohsh@yonsei.ac.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(4), 044501 (Mar 25, 2011) (6 pages) doi:10.1115/1.4003611 History: Received October 24, 2009; Revised December 21, 2010; Published March 25, 2011; Online March 25, 2011

A solid oxide fuel cell unit cell based on a scandia-stabilized zirconia (ScSZ) electrolyte for intermediate temperature operation (below 650°C) was manufactured as an anode-supported unit cell via uniaxial pressing, dip-coating, and screen printing methods. The nanocomposite powders used to improve anode performance were synthesized by selectively coating nanosized NiO particles on ScSZ core particles by the Pechini process. Anode-supported ScSZ electrolytes were fabricated by dip-coating a slurry of Ni-ScSZ composite powder on a die-pressed anode pellet, followed by dip-coating of the electrolyte ScSZ slurry. The lanthanum strontium manganite (LSM)-ScSZ cathode and the samarium doped ceria (SDC) interlayer were formed on the anode-supported ScSZ electrolyte using the screen printing method. The lanthanum strontium cobalt ferrite (LSCF)–SDC cathode was also formed on the SDC interlayer. The anode-supported unit cells designed and prepared in this study had a power density of 0.61Wcm2 at 800°C. Moreover, the unit cell structured by the functional layer and the LSCF cathode demonstrated excellent performance with a power density of 0.49Wcm2 at 650°C.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Gas permeation test equipment

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Figure 2

Unit cell performance test equipment

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Figure 3

Pore size and size distributions of Ni-ScSZ anode supports containing (a) 15 wt % and (b) 20 wt % carbon black

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Figure 4

Microstructures of the Ni-ScSZ anode supports containing (a) 5 wt %, (b) 15 wt %, and (c) 20 wt % carbon black

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Figure 5

Schematic and SEM image of NiO-ScSZ composite powders

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Figure 6

Gas permeabilities of the Ni-YSZ anode support and the Ni-ScSZ functional layer

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Figure 7

Surface image of the ScSZ electrolyte after sintering at 1400°C

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Figure 8

Surface image of the SDC interlayer after heat treatment at 1300°C

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Figure 9

Fracture surface and performance of the unit cell (Ni-YSZ anode support/ScSZ electrolyte/LSM-ScSZ cathode) at 800°C

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Figure 10

Fracture surface and performance of the unit cell (Ni-YSZ anode support/Ni-ScSZ functional layer/ScSZ electrolyte/SDC interlayer/LSM-ScSZ cathode) at 650°C

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