Abstract
La-doped ceria (La x Ce4−x O8−x/2: LDC) is one of the promising proton-conducting oxides applicable for electrolytes of proton-conducting solid oxide fuel cells because of its high chemical stability against CO2 and H2O. In this report, we investigate composition dependence of conductivity of LDC ceramics with 1.0 ≤ x ≤ 3.0. Single-phase LDC was obtained for x = 2.6 and the LDC ceramics with x = 2.6 exhibited the highest conductivity. Cell performance of an anode-supported cell with an LDC (x = 2.6) single-layer thin-film electrolyte was also evaluated. Moreover, the effect of stacking La28-y W4+y O54+3y/2 v 2-3y/2 (LWO) electrolyte with the LDC electrolyte on cell performance was examined. The bilayer cells, in which the LDC and the LWO electrolytes were stacked, exhibited higher open-circuit voltage values than the LDC single-layer cell because of suppressed leakage currents in the electrolyte. The bilayer structure will be an effective cell design to obtain high-performance p-SOFCs.
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