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Research Papers

Long-Term SOFCs Button Cell Testing

[+] Author and Article Information
Gianfranco DiGiuseppe

e-mail: gdigiuse@kettering.edu

Li Sun

Kettering University,
Mechanical Engineering Dept.,
1700 West Third Avenue,
Flint, MI 48504

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received April 10, 2013; final manuscript received October 18, 2013; published online December 5, 2013. Assoc. Editor: Dr Masashi Mori.

J. Fuel Cell Sci. Technol 11(2), 021007 (Dec 05, 2013) (5 pages) Paper No: FC-13-1034; doi: 10.1115/1.4025924 History: Received April 10, 2013; Revised October 18, 2013

This paper reports a new study where relatively long-term tests of about a 1000 h are performed on several planar anode-supported solid oxide fuel cells. The cell electrochemical behaviors are studied by using voltage-current density measurement, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The cell total polarization obtained from electrochemical impedance spectroscopy results is shown to be consistent with the area-specific resistance calculated from the voltage-current density curve over the course of the test. In addition, a four-constant phase element model is used to analyze the cell components resistances at different intervals over the lifetime of the test. Scanning electron microscopy and energy-dispersive X-ray spectroscopy are used postmortem to determine if any damages occurred to the cells and to determine if any change in composition occurred to the lanthanum strontium cobalt ferrite cathode. This study shows that the tested cells remain stable with a relatively small increase in the cell total polarization but with no increase in ohmic resistance.

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Figures

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Fig. 1

Cell voltages and temperatures as a function of time at different current densities (cell 1: 0 mAcm−2, cell 2: 300 mAcm−2, cell 3: 600 mAcm−2, and cell 4: 1200 mAcm−2)

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Fig. 2

ASR of cell 2, cell 3, and cell 4 as a function of testing time

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Fig. 3

Nyquist plots of the tested cells at OCV and different time intervals

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Fig. 4

CNLS fitting result of the impedance data for cell 4 before loading current and the four CPEs equivalent electrical circuit model

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Fig. 5

R0 to R4 values for cell 4 impedance at different testing times

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Fig. 6

SEM pictures of (a) cell 1, (b) cell 2, (c) cell 3, and (d) cell 4

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Fig. 7

Current density effects on the cathode concentration

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