Stability of BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} in a H{sub 2}O-containing atmosphere at intermediate temperatures
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
Barium cerate-based electrolytes have been extensively studied for intermediate-temperature (600 to 800 C) solid-state ionic devices because of their high ionic conductivities at these temperatures. However, the long-term stability of these materials under the conditions of intended applications, such as in a water vapor-containing atmosphere, has been controversial in recent literature. In this study, a gadolinium-doped barium cerate, BaCe{sub 0.8}Gd{sub 0.2}O{sub 3}, has been tested in an atmosphere containing 50 volume percent water vapor at 600 and 700 C for 1,000 h. X-ray diffraction, transmission electron microscopy, differential thermal analysis, and electrochemical measurements indicate that there is no creditable evidence to suggest an observable decomposition of BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} to Ba(OH){sub 2} and CeO{sub 2} under the testing conditions for up to 1,000 h, further confirming the stability of the material under fuel cell conditions demonstrated by others.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 516907
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 6 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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