Study on Gd3+ and Sm3+ co-doped ceria-based electrolytes
Journal
Journal of Solid State Electrochemistry
Journal Volume
9
Journal Issue
3
Pages
168-173
Date Issued
2005
Author(s)
Abstract
Doped ceria electrolytes of Ce1-aGda-y Sm yC2-0.5a, wherein a = 0.15 or 0.2, and 0 ≤ y ≤ a, were prepared with the citrate method, and characterized by inductively coupled plasma-atomic emission spectrometry, energy dispersive spectrometry, scanning electron microscopy, powder X-ray diffraction, and AC impedance spectroscopy. The effect of composition on the structure and conductivity was studied. All the samples were fluorite-type ceria-based solid solutions. For the singly doped samples, the optimal composition was Ce0.85Gd0.15O 1.925 for Gd3+-doped ceria (CGO), which showed higher ionic conductivity than the best Sm3+-doped ceria (CSO) at 773-973 K. For the co-doped samples, the ionic conductivities were higher than those of the singly doped ones in the temperature range 673-973 K when a = 0.15, but only better in 673-773 K when a = 0.2. For the samples of Ce0.85Gd 0.15-ySmyO1.925, wherein 0.05 ≤ y ≤ 0.1, much higher ionic conductivity was observed than those of the singly doped ceria at 773K-973 K. Therefore, these co-doped samples would be better than CGO and CSO to be the electrolytes of intermediate-temperature solid oxide fuel cells. © Springer-Verlag 2004.
SDGs
Type
journal article