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In this the first part of a two-part paper, the gas-diffusion process through a thick and porous tubular cathode substrate of a solid oxide fuel cell-(SOFC) was theoretically analyzed using classic Fick’s diffusion equation under the cylindrical coordinate system. The effects of current density, temperature, oxygen diffusivity or porosity, wall thickness, and bulk pO2 on the concentration (or pore in this paper) polarization were calculated and are presented graphically. The results clearly show a greater impact on pore polarization by current density, oxygen diffusivity, wall thickness, and bulk pO2, but not by temperature. In addition, the limiting current density, which is a characteristic of a material, was also derived based on the solved cylindrical-coordinated diffusion equation.


©Journal of The Electrochemical Society 2004, The Electrochemical Society.

© The Electrochemical Society, Inc. 2004. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of The Electrochemical Society].

Publisher’s Version:

Huang, K. (2004). Gas-Diffusion Process in a Tubular Cathode Substrate of an SOFC, Part I: Theoretical Analysis of Gas-Diffusion Process under Cylindrical Coordinate System. Journal of The Electrochemical Society, 151 (5), A716 - A719.