Solid oxide fuel cell

Solid oxide fuel cell (SOFC) is one of the most promising candidates for stationary power generation systems due to the highest energy conversion efficiency among all fuel cells, fuel flexibility, and low environmental emission. For its practical application, efficient operation at lower temperatures than 800 C is required. However, lowering the operating temperature leads to large polarization resistances of electrode reactions and to low oxygen-ion conductivity of solid electrolytes.

Development of low temperature SOFC based on structural designs

The polarization and ohmic resistances of SOFC can be reduced by developing of three-dimensionally ordered macroporous (3DOM) anode and thin electrolyte layer, respectively. Also, the surface modification of electrode by mix-conducting materials is effective to reduce the resistances of SOFC. We are trying to develop low temperature SOFC with ~ 1 W cm-2 at 400 C, based on those structural designs.

Fig. 1 SOFC with 3DOM anode

Fig. 2 Comparison of anode surface before and after the modification with mix-conducting materials