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Research Papers

Fabrication Characteristics of SOFC Single Cell Using Nanocrystalline 1Ce10ScSZ Electrolyte Powder prepared by Co-Precipitation Process

[+] Author and Article Information
Ju Hee Kang, Young Mi Kim, Moo Sung Lee, Jae Hyuk Jang, Jin-Hun Jo

 Korea Institute of Industrial Technology (KITECH), 1110-9, Oryong-dong, Buk-gu, Gwangju, 500-480, Korea Chonnam National University, 300, Yongbong-Dong, Buk-gu, Gwangju 500-757, Korea Samsung Electro-Mechanics Co., LTD. 312, Maetan3-Dong, Yeongtong-gu, Suwon, Gyeonggi-Do, 443-743, Korea Sungwoo Automotive Co., LTD, 1075-1, Yongmyeong-ri, Geoncheon-eup, Gyeongju-si, Gyeongsangbuk-do, 780-903, Korea

Ho-Sung Kim1

 Korea Institute of Industrial Technology (KITECH), 1110-9, Oryong-dong, Buk-gu, Gwangju, 500-480, Koreahosung42@kitech.re.kr Chonnam National University, 300, Yongbong-Dong, Buk-gu, Gwangju 500-757, Koreahosung42@kitech.re.kr Samsung Electro-Mechanics Co., LTD. 312, Maetan3-Dong, Yeongtong-gu, Suwon, Gyeonggi-Do, 443-743, Koreahosung42@kitech.re.kr Sungwoo Automotive Co., LTD, 1075-1, Yongmyeong-ri, Geoncheon-eup, Gyeongju-si, Gyeongsangbuk-do, 780-903, Koreahosung42@kitech.re.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(1), 011015 (Dec 27, 2011) (6 pages) doi:10.1115/1.4003783 History: Received January 20, 2011; Revised January 26, 2011; Published December 27, 2011; Online December 27, 2011

Nanocrystalline ceria-doped scandia-stabilized zirconia (1Ce10ScSZ) powders were prepared via the co-precipitation process for solid oxide fuel cell. The effects of the calcination temperature on different properties of the as-synthesized powders, such as phase evolution, crystalline size, and specific surface area were investigated. The synthesized powders calcined at 900 °C showed a specific surface area of 5 m2 g−1 and crystalline size of 28.2 nm, and ionic conductivity of 0.07S cm− 1 as measured at 750 °C. An anode-supported electrolyte with a thin electrolyte layer of 6μm composed of the synthesized 1Ce10ScSZ powders was fabricated using the tape-casting and co-sintering techniques for a solid oxide fuel cell (SOFC) single cell. The open-circuit voltage of the single cell thus obtained was 1.11 V at 750 °C, indicating the dense microstructure of the electrolyte layer. A power density of 0.9W cm− 2 was obtained for the SOFC single cell at 1.5A cm− 2 and 750 °C. The SOFC single cell fabricated using the nanocrystalline 1CeScSZ electrolyte exhibited good performance because of the drastic reductions in the ohmic resistances.

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Figures

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Figure 1

Schematic diagram for the preparation of ScSZ based-electrolyte materials using the co-precipitation process

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Figure 2

Schematic diagram for the fabrication of SOFC single cell using tape-casting and co-sintering

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Figure 3

TGA and DSC curve of as-synthesized precursor

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Figure 4

XRD patterns of the powders calcined at different temperatures

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Figure 5

SEM images of the 1Ce10ScSZ powders calcined at (a) 700, (b) 800, (c) 900 °C

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Figure 6

TEM images of the 1Ce10ScSZ powders calcined at (a) 700, (b) 900 °C

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Figure 7

Electrical conductivity of the synthesized 1Ce10ScSZ powders

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Figure 8

The assembly of the SOFC single cell (a), and its cross-section (b, c) and the surface morphology of electrolyte (d)

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Figure 9

I-V characteristics of SOFC single cell at the different operation temperature

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Figure 10

ASR characteristics of SOFC single cell at the different operation temperature

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Figure 11

Electrochemical comparative data of conventional and synthesis powder, (a) I-V curve and (b) impedance profile at 750 °C, respectively

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