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Design Innovation Papers

Measurements of Lateral Impedance and Local Characteristics of Solid Oxide Fuel Cells

[+] Author and Article Information
Shih-Wei Cheng1

Physics Division,  Institute of Nuclear Energy Research, No. 1000, Wunhua Rd., Jiaan Village, Longtan Township, Taoyuan County 32546, Taiwan, R.O.C.iamhoyo@gmail.com

Yaw-Hwa Shui, Yung-Neng Cheng, Ruey-Yi Lee

Physics Division,  Institute of Nuclear Energy Research, No. 1000, Wunhua Rd., Jiaan Village, Longtan Township, Taoyuan County 32546, Taiwan, R.O.C.

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(4), 045001 (Jun 14, 2012) (5 pages) doi:10.1115/1.4006799 History: Received April 10, 2011; Revised February 04, 2012; Published June 14, 2012; Online June 14, 2012

Lateral impedance and local characteristics of anode-supported solid oxide fuel cells (SOFCs) are studied in this paper. The testing device, which combines the original cell housing with a four-point probe equipment, is set for measuring SOFC single cell. The current collectors on anode and cathode in the original cell housing are, respectively, replaced by four independent probe units. They are not only to collect current, but also become measuring probes. Therefore, the lateral impedance of anode and cathode can be measured. Furthermore, the local characteristics are examined by open circuit voltage (OCV), I-V curve, and electrochemical impedance spectroscopy (EIS) measurements. The results show that the lateral impedance is substantially varied with temperature, the OCV at the center of the cell are higher than the edge, the central location on cell have better performance and lower impedance than the marginal location.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the single cell test device

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Figure 2

Schematic representation of the current collector units contact with the anode and cathode of the cell

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Figure 3

Lateral resistance of anode layer at several operating temperatures

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Figure 4

Lateral resistance of cathode layer at several operating temperatures

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Figure 5

Local OCV of the cell tested at several operating temperatures

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Figure 6

I-V, I-P curves test at different positions of the tested cell

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Figure 7

Impedance spectra test at different positions of the tested cell

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Figure 8

Comparisons of the ohmic, polarization, and area specific resistance at OCV

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Figure 9

Constant current testing of the tested cell at 800 °C

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