OverviewIn recent years, the Ni/YSZ (YSZ: Y2O3-stabilized ZrO2) cermet anode has been shown to be very promising for use in Solid Oxide Fuel Cells ( SOFCs). However, stability at high temperatures (~1000 °C) is required for long-term operation of such cells.
In general, Ni grains in a Ni/YSZ cermet sinter easily at temperatures over 800°C, and this sintering leads to the degradation of the performance of the SOFC. To obtain Ni/YSZ cermet anodes that are stable at high temperatures, it is essential to prevent sintering of Ni grains in the anode. Previously, it was reported that a new anode structure in which fine YSZ grains are dispersed on the surface of Ni grains improved the stability of a Ni/YSZ cermet anode . However, high stability as well as high electrochemical activity is also important for the Ni/YSZ cermet anode as the electrochemical activity strongly depends on a three-phase boundary (TPB) created among Ni grains, YSZ grains and pores.
Researchers at the University of Maryland have developed a spray pyrolysis technique that creates in a one step process a high temperature electrode of very good stability and having good electrochemical properties.
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