Mass/Charge Transfer in Mono-Block-Layer-Built-Type Solid-Oxide Fuel Cells

[+] Author and Article Information
J. J. Hwang

Center for Advanced Science and Technology,  Mingdao University, Peetou, Changhua 52345, Taiwanazaijj@mdu.edu.tw

J. Fuel Cell Sci. Technol 2(3), 164-170 (Jan 31, 2005) (7 pages) doi:10.1115/1.1895965 History: Received November 21, 2004; Revised January 31, 2005

The mass/charge transfer characteristics in a simulated MOLB (mono-block-layer built)-type solid-oxide fuel cells have been studied numerically. The transport phenomena within a linear MOLB module, including flow channels, active porous electrodes, electrolyte, and interconnections, are simulated using the finite volume method. The gas flow in the porous electrodes is governed by the isotropic linear resistance model with constant porosity and permeability. The diffusions of reactant species in the porous electrodes are described by the Stefan-Maxwell relation. Effective diffusivities for porous layers follow the Bruggman model. Porous electrochemistry is depicted via surface reactions with a constant surface-to-volume ratio, tortuosity, and average pore size. Results of the cathode-supported cell and the anode-supported cell are obtained, discussed, and compared thereafter for the first time.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Typical planar SOFC configurations

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Figure 2

Half cross-sectional views of the cathode-supported and anode-supported MOLB-type SOFCs

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Figure 3

(a) Velocity distributions on several cutting surfaces of the channels and electrodes of the anode-supported MOLB-type SOFC, and (b) secondary flow structures in the electrodes

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Figure 4

Comparison of mass flow flux of CO in the anode and anode channel, (a) cathode-supported cell, η=0.5V, (b) Anode-supported, η=0.5V, and (c) anode-supported cell, η=0.1V

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Figure 5

Comparison of mass flux of O2 in the cathode and cathode channel, (a) cathode-supported cell, η=0.5V, (b) anode-supported cell, η=0.5V, and (c) anode-supported cell, η=0.1V

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Figure 6

Comparison of the evolution of the species contraction along the channel direction between the cathode-supported and anode-supported SOFCs, η=0.5, (a) cathode-supported cell and (b) anode-supported cell

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Figure 7

Species concentration distributions in the electrodes of MOLB-type SOFCs along the middle of the inclined PEN plate, η=0.5 (a) cathode-supported cell and (b) anode-supported cell

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Figure 8

Current density distributions on the midchannel plane (Z=0.05) of the MOLB-type SOFCs, η=0.5, (a) cathode-supported cell and (b) anode-supported cell



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