Abstract
The characteristics of two solid oxide fuel cells (SOFCs) were compared using Ba3MoNbO8.5 and Ba7Nb4MoO20 sintered at 1100 and 1300 °C, respectively, as electrolytes. The electrolyte-supported SOFC single cells, Pt ǀ Sm0.2Ce0.8O1.9 ǀ electrolyte ǀ Sm0.2Ce0.8O1.9 ǀ Pt, with an electrolyte thickness of 1.0 mm were prepared. The resistivity of the bulk + grain boundary components of Ba3MoNbO8.5 and Ba7Nb4MoO20 were 2.25k and 212 Ω cm, respectively, at 600 °C, and their apparent activation energies for ion conduction were 122.3 and 72.8 kJ mol−1, respectively at 450–600 °C. When the I–V curves were evaluated at 450–600 °C with the introduction of 3% H2 (N2 balance) and air to the anode and cathode, respectively, the open circuit voltages and maximum power outputs at 600 °C were 0.95 V and 1.3 mW cm−2 for Ba3MoNbO8.5 and 0.97 V and 9.3 mW cm−2 for Ba7Nb4MoO20, respectively.
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