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Vol.53, No.4, 287 ~ 294, 2015
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| Title |
| Electrical Conductivity of Ni-YSZ Anode for SOFCs According to the Ni Powder Size Variations in Core-shell Structure |
| Young Jin Kang , Sung Hun Jung , Yong Tae An , Byung Hyun Choi , Mi Jung Ji |
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| Abstract |
| Ni-YSZ (Y2O3-stabilized ZrO2) core-shell structures were prepared by a high-speed mixing method, starting from Ni particles of three different average sizes of 0.2, 0.4, and 1.8 μm. The Ni-YSZ core-shell structures prepared using Ni particles of size 0.2, 0.4, and 1.8 μm exhibited dense core, porous core, and random-morphology core, respectively. Subsequently, nanostructured cermet anodes were fabricated using the prepared Ni-YSZ core-shell powders. During the formation of cermet, the heat treatment of Ni-YSZ core-shell powder results in the eruption of Ni core out of the YSZ shell layers, thereby facilitating the formation of nanostructured Ni-YSZ cermet. Systematic studies indicated that the morphology and electrical conductivity of the prepared Ni-YSZ core-shell powders and the cermet anode varied, depending on the initial particle size of the Ni particles. Of the different samples prepared in this study, the Ni-YSZ cermet prepared using Ni particles of size 0.4 μm showed the highest electrical conductivity at 750 ℃. (Received May 15, 2014) |
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| Key Words |
| fuel cells, powder processing, electrical properties, scanning electron microscopy, SEM, ohmic resistance |
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