In this work we propose the use of a new bilayer structure composed by a mixed ionic and electronic conductor (MIEC) and an electrolyte (YSZ) in high performance solid oxide fuel cell. Modeling and simulation studies of the electrochemical and transport phenomena, using experimental data from the literature, show that 670 ºC (943 K) can be considered the temperature of minimum polarization resistance. This indicates that yttrium substituted strontium titanate (YST) acting as a MIEC can advantageously replace conventional anode of Ni-NiO, which presents temperature of electronic conduction of 1000 ºC. The temperature rise contributed to the improvement of the ionic conductivity of the material, since in regions near the YSZ / MIEC interface vacancy concentration increased, showing that there is an optimal operation temperature of the anode structure, and SOFC that results in high levels of vacancy, but at the same time reduce the polarization resistance.