Elementary Reaction Models for CO Electrochemical Oxidation on an Ni/YSZ Patterned Anode
Author(s)
Shi, Yixiang
Lee, Won yong
Ghoniem, Ahmed F
Date Issued
June 2010
Journal
ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2
Publisher
ASME International
Citation
Shi, Yixiang, et al. “Elementary Reaction Models for CO Electrochemical Oxidation on an Ni/YSZ Patterned Anode.” ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2, 14-16 June, 2010, Brooklyn, New York, ASME, 2010, pp. 159–66. © 2010 by ASME
Version
Final published version
Abstract
Analysis of recent experimental impedance spectra and polarization curves of nickel/yttria-stabilized zirconia (Ni/YSZ) patterned anode of a solid oxide fuel cell (SOFC) are used to determine the limiting steps in CO electrochemical oxidation kinetics. A comprehensive 1D model is proposed for the prediction of the steady-state polarization curve of a patterned anode SOFC. The model incorporates gas species adsorption/desorption with surface diffusion and one of two possible charge transfer reaction steps: O charge transfer reaction [O 2-(YSZ)+(Ni)→(YSZ)+O(Ni)+2e-], or CO charge transfer reaction [O2-(YSZ)+CO(Ni)→(YSZ)+CO2(Ni)+2e -]. We show that the mechanism incorporating charge transfer between adsorbed CO and oxygen vacancy is able to better predict the experimental data. We estimate some of the model parameters, such as the exchange current density and charge transfer coefficient by fitting the simulation of the polarization curves to the experimental data.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1115/FuelCell2010-33205
