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Research Papers

Optimal Design of Current Takeoff in Bus Bars for Tubular Solid Oxide Fuel Cells

[+] Author and Article Information
Gianfranco DiGiuseppe1

 Siemens Power Generation, Pittsburgh, PA 15235gdigiuse@kettering.edu

Robert Draper

 Siemens Power Generation, Pittsburgh, PA 15235

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(2), 021013 (Apr 21, 2008) (9 pages) doi:10.1115/1.2784280 History: Received November 22, 2005; Revised April 19, 2007; Published April 21, 2008

The technology of tubular solid oxide fuel cells of cylindrical geometry has advanced enough such that several demonstration units are currently being tested. This paper presents a simple analytical model for the determination of the current density as a function of axial active cell length under idealized conditions. In addition, a current density axial profile under generator conditions obtained from modeling work is used and compared to the simpler approach. The resulting current density axial profiles are then used to design current takeoff in bus bars where the losses in the power leads are minimized. The result is an optimal scenario where bus bars can be considered to be surfaces that do not significantly affect the natural current density of the solid oxide fuel cell.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Standard air electrode supported (AES) cylindrical SOFC

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Figure 3

Typical measured voltage-current density characteristics for cylindrical cell testing

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Figure 4

Current density as a function of axial position for a typical cylindrical cell testing at javg=300mAcm−2

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Figure 5

Current density as a function of axial position under generator conditions with all influencing factors included at javg=200mAcm−2

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Figure 6

Cell to bus-bar current density intensification factor

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Figure 7

Integration of current density along the bus bar from opposite ends toward the power lead

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