For successful commercialization of solid oxide fuel cells (SOFCs), lowering operation temperature to the intermediate temperature (IT) range (&lt;500°C) is essential. For operation of anode-supported SOFCs, that is the most typical stack for large-scale fuel cells, at this IT regime, it is critical to develop high performance cathodes as a significant portion of energy loss occurs at the oxygen reduction reaction (ORR). ORR at the conventional perovskite SOFC cathodes has a high activation energy of 1.5-2.0 eV, accordingly the cathodic resistance dramatically increases with temperature decrease. For this reason, most of conventional SOFCs have marked relatively low power output under 100 mW cm<sup>-2</sup> below 500°C. In this work, we have fabricated novel Ag-composite cathodes comprised of porous Ag mesh surface-decorated with ceramic electrolyte nano-particulates ranging 1-20nm and have demonstrated operation of &gt;150 mW cm<sup>-2</sup> on the NiO-supported SOFCs at 450°C.

Ag-composite cathode for high-performance, intermediate temperature, solid oxide fuel cells

251st National Meeting (2016)

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