Abstract
Solid Oxide Fuel Cells (SOFCs) are affected by sulfur compounds contained in almost all available fuels. Even small amounts of sulfur in the ppm range can decrease the performance of SOFCs. In this contribution the impact of sulfur on the durability of Ni-based cermet anodes will be discussed. Different Ni/ceria cermet anodes were tested with respect to their sulfur tolerance. Impedance analysis of single cells exhibiting such anodes revealed a significantly improved sulfur tolerance. The best performance with an initial polarization resistance below 200 mW×cm² was achieved by infiltrating a Ni/CeO2 coating. The high sulfur tolerance of such anodes seems to be attributed to the large amount of Ni/ceria triple phase boundaries. A durability test of an anode supported cell with Ni/zirconia cermet anode and Ni/CeO2 coating was performed. The test revealed a good initial performance but a strong degradation of the polarization resistance.
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