Modelling of elementary kinetics of H₂ and CO oxidation on ceria pattern cells

Elementary kinetic mechanisms of fuel oxidation on ceria have not been dealt with in detail in literature. An elementary kinetic model is developed considering charge transfer and adsorption steps for electrochemical H₂ and CO oxidation on ceria. The reaction chemistry is solved by fitting previously obtained impedance spectra for H₂ and CO oxidation on ceria. The rate determining step is found to be the charge transfer rather than the adsorption for both H₂ and CO. A method is presented to extend the kinetics obtained from pattern anodes to macroscopic simulations in which the activation overvoltage can be calculated on the basis of elementary kinetics.