Effective electrode reaction area of cofired type planar SOFC

In order to investigate the distribution of the electrode reaction area of cofired cells in the direction of the electrode thickness, we measured the exchange current density of the anode and cathode with the various thicknesses. As the results, the exchange current density of the anode increased with increasing thickness of anode below 10 mu m, and it attained almost constant value in thickness larger than 10 mu m. On the other hand, the exchange current density of the cathode increased linearly with increasing thickness. From these results, the anodic reaction area was localized around the anode/electrolyte interface, but the cathodic reaction area was dispersed in the whole parts of the cathode.