In this study, we report that effects of a filler with a high coefficient of thermal expansion on a sealant for high-temperature (750 ~850 o C) SOFC. We designed a SiO 2 -BaO-ZnO-B 2 O 3 -Al 2 O 3 glass system with a softening temperature higher than 750 o C. The properties of the glass system show not only low volumetric shrinking but also low swelling. The glass system did not create a crystal phase during along-term heat treatment. We fabricated a seal gasket with 0, 10, 15, and 20 wt% cristobalite added as filler materials with glass powder. The coefficient of thermal expansion of the seal gasket increased according to cristobalite content. During alongterm heat treatment, the leak rate decreased by about 5% after a heat treatment in an oxidizing atmosphere at 750 o C for 2000 h, also decreasing by about 6% after a heat treatment in a reducing atmosphere at 750 o C for 1000 h.
8 mol% Y-doped SrTiO 3 powder was synthesized by Pechini method from titanium isopropoxide, strontium nitrate, yttrium nitrate, citric acid and ethylene glycol. A Y 2 Ti 2 O 7 pyrochlore phase-free perovskite powder was obtained by calcining a polymeric resin, which was prepared from a precursor solution, at 500 o C in an air atmosphere. Low temperature calcination could lead to a fine-grained microstructure. In the case of a solid-state reaction, an extended heat-treatment at high temperature in a reduced atmosphere needed to obtain a single phase perovskite SrTiO 3 .
An Ni-Fe/YSZ core-shell structured anode for uniform microstructure and catalytic activity was synthesized. Flat tubular segmentedin-series solid oxide fuel cell-stacks were prepared by decalcomania method using synthesized anode powder. The Ni-Fe/YSZ coreshell anode exhibited better electrical conductivity than a commercially available Ni-YSZ cermet anode. Also power output increased by 1.3 times with a higher open circuit voltage. These results can be attributed to the uniformly distributed Ni particles in the YSZ framework. The impedance spectra of a Ni-Fe/YSZ core-shell anode showed comparable reduced ohmic resistance similar to those of the commercially available Ni-YSZ cermet anodes.
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