Page 190 - High Temperature Solid Oxide Fuel Cells Fundamentals, Design and Applications
P. 190
Anodes 167
Current Density (mA/cm2)
Figure 6.13 Current-potential characteristics of copper cermets at 800°C showing effect of hydrocarbon
fueZ and eZectrocataZysis by ceria: (0) hydrogen on CuIYSZ cermet; (A) hydrogen on cermet catalyzed by
ceria. Filledsymbols = methane[43].
0 30 60 90 120 150 180
Time (min.)
Figure 6.14 StabiZity of ceria-catalyzed copper cermet under different fuel conditions contrasts with rapid
irreversible deactivation of nickel cermet 1431.
ReEractory electronic-conducting ceramics may also provide candidate
materials for the direct oxidation anode. Ceria and its solid solutions with other
rare earths, cerates and titanates [46] have been investigated. Given their
variation in conductivity with gas environment they may have to be used with
metals in composites. The perovskites, of general formula AB03, where A and B
