Abstract
Considering that conventional lanthanum chromate (LaCrO 3) interconnector is hard to be co-sintered with green anode, we have fabricated a novel bilayered interconnector which consists of La-doped SrTiO 3 (Sr 0.6La 0.4TiO 3) and Sr-doped lanthanum manganite (La 0.8Sr 0.2MnO 3). Sr 0.6La 0.4TiO 3 is conductive and stable in reducing atmosphere, locating on the anode side; while La 0.8Sr 0.2MnO 3 is on the cathode side. A slurry-brushing and co-sintering method is applied: the Sr 0.6La 0.4TiO 3 and La 0.8Sr 0.2MnO 3 slurries are successively brushed onto green anode specimen, followed by co-firing course to form a dense bilayered Sr 0.6La 0.4TiO 3/La 0.8Sr 0.2MnO 3 interconnector. For operating with humidified hydrogen and oxygen at 900 °C, the ohmic resistances between anode and cathode/interconnector are 0.33 Ω cm 2 and 0.186 Ω cm 2, respectively. The maximum power density is 290 mW cm −2 for a cell with interconnector, and 420 mW cm −2 for a cell without it, which demonstrates that nearly 70% of the power output can be achieved using this bilayered Sr 0.6La 0.4TiO 3/La 0.8Sr 0.2MnO 3 interconnector.
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