Analysis of Gas Transport in Porous Ni-YSZ Anodes by Transient Response Method
Open Access
- 1 January 2001
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 2001-16 (1) , 719-727
- https://doi.org/10.1149/200116.0719pv
Abstract
Chemical relaxation of fuel partial pressure (H2, CO, and/or CH4) is analyzed to quantify gas transport at 1000°C in porous Ni-YSZ electrodes of solid oxide fuel cells. Pore size of Ni-YSZ electrodes was mainly below l µm, and thus both the bulk-gas diffusion and the Knudsen diffusion may have contributed to the gas transport. The diffusion kinetics of the fuels was influenced by the kind and the concentration of the fuel gas. These results indicate that the diffusion process of fuel gases in the electrode pores, a major source of the concentration polarization, may become sluggish for fuel gases with a larger molecular weight. For CH4 fuel, the response curve was affected by reforming reactions.Keywords
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