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Research Papers

Seal Leakage Effects on the Electrical Performance of an SOFC Button Cell

[+] Author and Article Information
Gianfranco DiGiuseppe

Kettering University,
1700 University Avenue,
Flint, MI 48504-4898
e-mail: gdigiuse@kettering.edu

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received August 22, 2012; final manuscript received September 19, 2012; published online November 16, 2012. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 9(6), 061006 (Nov 16, 2012) (7 pages) doi:10.1115/1.4007815 History: Received August 22, 2012; Revised September 19, 2012

This paper reports a new study where leakages through a seal in a solid oxide fuel cell (SOFC) button cell is investigated in detail. A 2D model is used to determine different flow characteristics of the leakages and its effects on the cell performance. The leakage effects on the performance are studied at different seal porosities, and other parameters are also investigated. The results of this investigation indicate that a seal leakage can affect the cell performance significantly if the leak comes from outside the test rig. That is, an air leak must be present through the seal and must flow into the anode chamber, where then it affects negatively the cell performance. In addition, the model developed here can be used to include leakages in stack modeling studies.

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References

Figures

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Fig. 1

Illustration of the button cells testing setup (not drawn to scale) and mesh used (drawn to scale)

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Fig. 2

Voltage-current density curves at different seal conditions for the first scenario

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Fig. 3

Percent change in current density at different seal conditions for the first scenario

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Fig. 4

Seal open channel: (a) velocity profiles and velocity vectors and (b) magnification of velocity profiles in the anode chamber

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Fig. 5

Seal open channel at 0.3 V: (a) velocity profiles and streamlines and (b) hydrogen concentration in and near anode surface

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Fig. 6

Seal open channel and combustion zone at 0.3 V: hydrogen concentration in anode and fuel chamber

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Fig. 7

Voltage-current density curves at different seal conditions and air leakages through the seal for the second scenario

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Fig. 8

Percent change in current density at different seal conditions and air leakages through the seal for the second scenario

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Fig. 9

Air leak of 15 sccm at 0.3 V: velocity vectors and hydrogen concentration in anode and fuel chamber

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