| Title |
Electrical Conductivity of Ni-YSZ Anode for SOFCs According to the Ni Powder Size Variations in Core-shell Structure |
| Authors |
(Young Jin Kang); (Sung Hun Jung); (Yong Tae An); (Byung Hyun Choi); (Mi Jung Ji) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.4.287 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
fuel cells; powder processing; electrical properties; scanning electron microscopy; SEM; ohmic resistance |
| 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) |