CONICET | Buscador de Institutos y Recursos Humanos

The employment of new electrolyte materials (like gadolinium doped ceria and lanthanum gallate) allowed the development of the intermediate temperature solid oxide fuel cells (IT-SOFC), which represent an alternative to conventional SOFC (with yttria-stabilized zirconia electrolyte) due to its lower operation temperature (500 - 700ºC) and cost (1). However, cathode overpotential becomes important at these temperatures, decreasing the cell performance (2). Most of the research found in literature deals with cathode composition, although it is recognized that microstructure also plays a significant role in cathode performance (3-7). In that sense, we have previously reported (8) that nanostructured cathodes present small area specific resistance (ASR) values, and they are even lower that those reported for the best known cathodes for IT-SOFC like BSFC in the 400-550 ºC temperature range (see Figure 1). In spite of the excellent performance of nanostructured cathodes, their long term stability is still in doubt. In order to contribute to that issue, we present a study of the area specific resistance (ASR) evolution from nanostructured La1-xSrxCo1-yFeyO3-δ (LSCFO) cathodes, over a continuous measurement period of 1000 hours in air at 500°C.

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