0
Research Papers

Effects of Electrode Microstructure on Intermediate Temperature Solid Oxide Fuel Cell Performance

[+] Author and Article Information
Edward J. Naimaster

 University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816

A. K. Sleiti1

 University of North Carolina Charlotte, 9201 University City Boulevard, Charlotte, NC 28223-0001asleiti@uncc.edu

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(5), 051015 (Jul 20, 2010) (15 pages) doi:10.1115/1.4000683 History: Received April 13, 2009; Revised August 04, 2009; Published July 20, 2010; Online July 20, 2010

In this study, the effects of electrode microstructure and electrolyte parameters on intermediate temperature solid oxide fuel cell (ITSOFC) performance were investigated using a one-dimensional solid oxide fuel cell model from the Pacific Northwest National Laboratory (PNNL). The activation overpotential was investigated through the exchange current density term, which is dependent on the cathode activation energy, the cathode porosity, and the pore size and grain size at the cathode triple phase boundary. The cathode pore size, grain size, and porosity were not integrated in the PNNL model, therefore, an analytical solution for exchange current density from Deng and Petric (2005, “Geometric Modeling of the Triple-Phase Boundary in Solid Oxide Fuel Cells,” J. Power Sources, 140, pp. 297–303) was utilized to optimize their effects on performance. Through parametric evaluation and optimization of the electrode microstructure parameters, the activation overpotential was decreased by 29% and the overall ITSOFC maximum power density was increased by almost 400% from the benchmark PNNL case. The effects and importance of electrode microstructure parameters on ITSOFC performance were defined. Optimization of such parameters will be the key in creating viable ITSOFC systems. Although this was deemed successful for this project, future research should be focused on numerically quantifying and modeling the electrode microstructure in two- and three-dimensions for more accurate results, as the electrode microstructure may be highly multidimensional in nature.

Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 2

PNNL benchmark case maximum power density

Grahic Jump Location
Figure 3

PNNL benchmark case overpotentials

Grahic Jump Location
Figure 4

PNNL benchmark case activation overpotential

Grahic Jump Location
Figure 5

Cathode activation energy parametric evaluation at 600°C

Grahic Jump Location
Figure 6

Cathode activation energy parametric evaluation at 800°C

Grahic Jump Location
Figure 7

Effects of Eact,cath on Butler–Volmer loss

Grahic Jump Location
Figure 8

Effect of pore radius at cathode TPB on exchange current density (full T range)

Grahic Jump Location
Figure 9

Effect of pore radius at cathode TPB on exchange current density (low T range)

Grahic Jump Location
Figure 10

Effect of grain size at cathode TPB on exchange current density (full T range)

Grahic Jump Location
Figure 11

Effect of grain size at cathode TPB on exchange current density (low T range)

Grahic Jump Location
Figure 12

Effect of cathode porosity on exchange current density (full T range)

Grahic Jump Location
Figure 13

Effect of cathode porosity on exchange current density (low T range)

Grahic Jump Location
Figure 14

Effects of cathode porosity at 600°C

Grahic Jump Location
Figure 15

Effects of cathode tortuosity of 50.00 on ITSOFC performance

Grahic Jump Location
Figure 16

Effects of cathode tortuosity of 50.00 and cathode porosity of 0.10 on ITSOFC performance

Grahic Jump Location
Figure 17

ITSOFC optimization results

Grahic Jump Location
Figure 18

One-dimensional SOFC flux model path (20)

Grahic Jump Location
Figure 19

PNNL anode H2/CO diffusion electrical circuit analogy (10)

Grahic Jump Location
Figure 20

PNNL proposed H2 competitive adsorption/surface diffusion mechanism (10)

Grahic Jump Location
Figure 21

Effects of competitive adsorption/surface diffusion with current density (6)

Grahic Jump Location
Figure 1

PNNL benchmark case

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.

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