Consolidation and properties of Gd0.1Ce0.9 O1.95 nanoparticles for solid-oxide fuel cell electrolytes
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 119-124 |
Journal / Publication | Journal of Materials Research |
Volume | 21 |
Issue number | 1 |
Online published | 1 Jan 2006 |
Publication status | Published - Jan 2006 |
Externally published | Yes |
Link(s)
Abstract
Gd-doped ceria solid solutions have been recognized to be leading electrolytes for use in intermediate-temperature fuel cells. In this paper, the preparation, solubility, and densification of Gd0.1Ce0.9O1.95 ceramics derived from carbonate co-precipitation are reported. The dissolution of Gd2O3 in CeO2 lattice was identified to be completed during the co-precipitation process by studying the lattice parameter as a function of temperature. After calcination at 800 °C for 2 h, the nano-sized Gd0.1Ce0.9O1.95 powder (∼33 nm) with a nearly spherical shape and a narrow particle-size distribution was obtained. This calcined powder has high sinterability and maximum densification rate at ∼1000 °C. Sintering at 1300 °C for 4 h yielded over 97% relative density with near maximum. The grain size increased with increases in sintering temperature. The ionic conductivity of these pellets was tested by alternating current impedance spectroscopy to elucidate the contribution of intragranular and intergranular conductivity to the total ionic conductivity. It was found that sintering temperature does not affect intragranular conductivity, though intergranular conductivity was strongly influenced by grain size, grain boundary area, and relativity density. This pellet sintered at 1500 °C for 4 h showed a high ionic conductivity of 5.90 × 10-2 s/cm when measured at 750 °C. The characterization and structural evaluation of the as-received powders were carried out using x-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller, and dilatometer and impedance analysis. © 2006 Materials Research Society.
Research Area(s)
Citation Format(s)
Consolidation and properties of Gd0.1Ce0.9 O1.95 nanoparticles for solid-oxide fuel cell electrolytes. / Tok, A. I. Y.; Luo, L. H.; Boey, F. Y. C. et al.
In: Journal of Materials Research, Vol. 21, No. 1, 01.2006, p. 119-124.
In: Journal of Materials Research, Vol. 21, No. 1, 01.2006, p. 119-124.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review