Abstract
The effects of cobalt addition on the sintering, thermal, and electrical properties of Ce0.9Gd0.1O1.95 (GDC) and Zr0.89Sc0.1Ce0.01O2-δ (ScSZ) were investigated. A small addition of cobalt oxide remarkably enhanced the sinterability of GDC, especially for GDC powder with a specific surface area of 40 m2 g-1, which was synthesized via a citrate method. Relative densities of approximately 95% can be achieved for GDC pellet samples using 2 mol% Co dopant and sintering at 1100 °C for 10 h. The thermal expansion and electrical conductivity of 2 mol% Co-doped GDC were comparable to those of the non-doped sample. The thermal expansion of ScSZ with various amounts of Co addition was linear in both oxidizing and reducing atmospheres. The electrical conductivity of Co-doped ScSZ decreased with increasing Co content; however, this decrease was not dramatic. These results suggest that the addition of cobalt oxide is a promising method for obtaining GDC buffer layers that are sinterable at low temperatures for use in intermediate temperature-solid oxide fuel cells.
Original language | English |
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Pages (from-to) | 49-54 |
Number of pages | 6 |
Journal | Journal of Power Sources |
Volume | 193 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 Aug 1 |
Keywords
- Cobalt
- Doping
- GDC
- ScSZ
- Solid oxide fuel cells
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering