Theoretical Calculation of the Electrical Potential at the Electrode/Electrolyte Interfaces of Solid Oxide Fuel Cells

[+] Author and Article Information
Ismail Celik

 West Virginia University, Mechanical and Aerospace Engineering Department, PO Box 6106, Morgantown, WV 26506ismail.celik@mail.wvu.edu

S. Raju Pakalapati, Maria D. Salazar-Villalpando

Mechanical and Aerospace Engineering Department, West Virginia University, Morgantown, WV, USA

J. Fuel Cell Sci. Technol 2(4), 238-245 (Mar 23, 2005) (8 pages) doi:10.1115/1.2039956 History: Received October 14, 2004; Revised March 23, 2005

A new semi-empirical model is formulated to calculate the potential differences at the cathode/electrolyte and electrolyte/anode interfaces separately for solid oxide fuel cells. The new model is based on a reduced reaction mechanism, and it accounts for the oxygen ion concentration at these interfaces. The model also considers the Gibbs free energy for the two electrode interfaces seperately. Results from case studies demonstrate the great potential of the proposed model

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic of variation of electric potential across a SOFC

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Figure 2

Variation of transfer coefficient with temperature

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Figure 3

Variation of anode-limiting current with pore size

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Figure 4

Comparison of experimental (13) and calculated cathode overpotentials: transfer coefficients from Eq. 19 with βmin=0.116, γ=0.06, Ts=1035 and pore size=0.45μm

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Figure 5

Comparison of experimental (13) and calculated anode overpotentials: transfer coefficients from Eq. 19 with βmin=0.2, γ=0.2, Ts=975 and pore-size=0.25μm.

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Figure 6

V-I plots at different temperatures using constant oxygen ion concentration in electrolyte at all temperatures (YO==0.1)

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Figure 7

Influence of oxide ion concentration on V-I plots at T=973K

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Figure 8

Comparision between the experimental (20) results and model predictions of V-I plots for different fuel gas compositions.



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