Mathematical modelling of transports and reaction in an innovative solid oxide fuel cell

A mathematical model for the description of transport phenomena and reactions in an innovative solid oxide fuel cell (IDEAL-Cell) is presented. Modelling focuses on the central membrane (CM), a porous composite layer of proton-conducting and anion-conducting phases between cathodic and anodic compartments where water is produced. The model is based on charge and mass balances using effective parameters (continuum approach) related through percolation theory to morphology and material properties. The model is validated with experimental data, providing an estimation of the kinetic parameter of water recombination reaction. Simulations show that the main contribution to cell polarization resistance is the ohmic resistance of CM, so cell performance can be improved by decreasing CM thickness and porosity respectively to 150 μm and 40