An attempt has been made here to synthesize (1−x)Ba0.6Sr0.4CZY-xGDC (x=0, 0.2, 0.5) composite electrolytes and investigated their phase(s), X-ray photo spectra (XPS) and conduction properties. All compositions possess dual phases (perovskite-type as well as cubic fluorite structure) and show proton conduction in various atmospheres. Homogeneous formation and compatibility between phases have been confirmed from X-ray diffraction analysis. Detailed X-ray photoelectron spectroscopy (XPS) studies on the oxidation states of barium, strontium, gadolinium, cerium, zirconium, yttrium, and oxygen was performed. With increasing “x”, oxygen vacancy concentration increases as cerium ions in 4+ oxidation state decreases. The conduction behavior of composites depicts the protonic in nature and total activation energy lying in the range of 0.16-0.24 eV. This study indicates that the conductivity increases with GDC content in composite electrolytes and highest conductivity is found for composite with x=0.5. These characteristics are useful to make (1−x)Ba0.6Sr0.4CZY-xGDC composite electrolytes as promising candidate of central membrane for advanced fuel cell technology.
Bibliographical noteFunding Information:
This research was financially supported by the institutional research program of the Korea Institute of Science and Technology and the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Trade, Industry and Energy, Korea (No. 10050985).
© 2017 The American Ceramic Society
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry