0
Article

Time Dependent Properties and Performance of a Tubular Solid Oxide Fuel Cell

[+] Author and Article Information
Gang Ju, Kenneth Reifsnider, Xinyu Huang, Yanhai Du

 Connecticut Global Fuel Cell Center, University of Connecticut, Storrs, CT, 06269

J. Fuel Cell Sci. Technol 1(1), 35-42 (May 17, 2004) (8 pages) doi:10.1115/1.1782926 History: Received May 06, 2004; Revised May 17, 2004

Time dependent properties and performance of tubular solid oxide fuel cells were studied numerically and experimentally. The numerical model incorporated local characteristics such as porosity, tortuosity, grain size, and conductivity and was used to evaluate the specific and relative changes in performance caused by the effect of time-dependent material changes of those characteristics. A 500 hour experimental study was conducted at 800°C in 97%H23%H2O on an extruded LSCo-La0.6Sr0.4CoO3LSGMNi electrolyte-supported tubular SOFC made in our laboratory. Changes in current density with time (at constant voltage) formed a curve with initial convex (upward) curvature, becoming monotonic decreasing. The microstructure of the constituent layers was examined by scanning electron microscopy. Comparisons between model predictions and experimental observations were made. For the situation modeled and tested, the porosity and ionic conductivity were found to be most influential on performance. More importantly, the effect of porosity is a trade-off between the influence on gas transport and the mixed conductor influence on the electrochemical reactions at the electrode.

FIGURES IN THIS ARTICLE
<>
Copyright © 2004 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

A generic drawing of the tubular solid oxide fuel cell

Grahic Jump Location
Figure 2

Fuel cell 500 hours durability test result, current (A) versus time (hour)

Grahic Jump Location
Figure 6

Effective charge transfer resistance as a function of porosity ε, ionic conductivity σ and grain size B

Grahic Jump Location
Figure 7

Current density versus spatially linear varied porosity at the voltage=0.7V

Grahic Jump Location
Figure 8

Current Density versus the ionic conductivity at the voltage=0.7V

Grahic Jump Location
Figure 9

Current density as a function of pore size at the voltage=0.7V

Grahic Jump Location
Figure 10

Current density as a function of grain size at the voltage=0.7V

Grahic Jump Location
Figure 11

(a) SEM micrographs of LSCo-La0.6Sr0.4CoO3 composite cathode in three different locations; (b) Image analysis of the objects in SEM micrographs using ImageJ software, and (c) three-dimensional surface plot of the pixel analysis.

Grahic Jump Location
Figure 12

Generic trend chart of properties as a function of time

Grahic Jump Location
Figure 5

Current Density versus spatially uniform distributed porosity of the electrodes at the voltage=0.7V

Grahic Jump Location
Figure 3

Experimental results: cell voltage and power density as a function of current density

Grahic Jump Location
Figure 4

Modeled fuel cell voltage versus current density, and voltage and various polarizations versus current density of the electrolyte supported SOFC

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In