An Elementary Kinetic Model for the LSCF and LSCF-CGO Electrodes of Solid Oxide Cells: Impact of Operating Conditions and Degradation on the Electrode Response

An elementary kinetic model was developed to predict the electrochemical response of porous LSCF and LSCF-CGO electrodes. The validated thanks experiments performed on symmetrical cells using a three-electrode setup. After calibration polarization curves, it has been shown that is able simulate accurately experimental impedance diagram at OCP under without additional fitting. Moreover, evolution electrode resistance with oxygen partial pressure well reproduced by model. electrodes reaction mechanism thoroughly analyzed transition from bulk path surface depends temperature, pressure. rate-determining steps for have identified as function Finally, sensitivity analysis study impact demixing performances. For given decomposition, highlighted passivation would be more impacting than decrease ionic conductivity. decomposition detrimental performances evaluated in electrolysis mode.