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Preparation of Ni-GDC powders by the solution reduction method using hydrazine and its electrical properties
- Authors
- Kim, S.-J.; Kim, K.-M.; Cho, P.-S.; Cho, Y.-H.; Lee, C.-Y.; Park, S.-Y.; Kang, Y.C.; Lee, J.-H.
- Issue Date
- 2008
- Keywords
- Anode; Hydrazine reduction; Ni-GDC; SOFC
- Citation
- Korean Journal of Materials Research, v.18, no.12, pp.660 - 663
- Indexed
- SCOPUS
KCI
- Journal Title
- Korean Journal of Materials Research
- Volume
- 18
- Number
- 12
- Start Page
- 660
- End Page
- 663
- ISSN
- 1225-0562
- Abstract
- Ni-GDC (gadolinia-doped ceria) composite powders, the anode material for the application of solid oxide fuel cells, were prepared by a solution reduction method using hydrazine. The distribution of Ni particles in the composite powders was homogeneous. The Ni-GDC powders were sintered at 1400 °C for 2 h and then reduced at 800 °C for 24 h in 3 % H2. The percolation limit of Ni of the sintered composite was 20 vol%, which was significantly lower than these values in the literature (30-35 vol%). The marked decrease of percolation limit is attributed to the small size of the Ni particles and the high degree of dispersion. The hydrazine method suggests a facile chemical route to prepare well-dispersed Ni-GDC composite powders.
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