EFFECTS OF DIFFERENT DESIGN PARAMETERS ON THE PERFORMANCE OF MCFC CATHODES

The effects of electrode thickness, electrolyte filling and current co llector geometry on the performance of MCFC cathodes are investigated by using a steady state mathematical model. A two-dimensional pseudo-h omogeneous model for the three-phase system in the cathode is used, wh ich includes the polarisation curves from the heterogeneous agglomerat e model[1] as local source functions. The model takes into account the potential distribution in the electrolyte and catalyst phase but negl ects mass transport limitations in the gas phase. The simulations show that, for cathodes with a finite electronic conductivity, there is a substantial potential distribution perpendicular to the depth of the e lectrode depending on the size of the gas holes in the current collect or.