Abstract
The overpotential in a three-dimensional La_<1-x>Sr_xCo_<1-y>Fe_yO_<3-δ> (LSCF) cathode structure obtained by a dual-beam focused ion beam-scanning electron microscope is predicted by the lattice Boltzmann method. Gaseous, ionic and electronic transport equations with electrochemical reaction at LSCF/pore boundary are solved with an assumption of local equilibrium in the solid oxide. The gas transport is modeled by a so-called dusty gas model. The numerical simulation is performed under the current density conditions of 0.01, 0.05, 0.1 and 0.2 A/cm^2. The cathode overpotentials predicted by this method agreed well with the experimental results. Three-dimensional chemical potential distributions inside a cathode microstructure are presented. The proposed method can be used for predicting polarization in mixed ionic electronic conductor electrode.
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