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Quantitative characterization of Cr-adsorption on CeO2, pure and doped BaCeO3 and its impact on the electrochemical performance of Ce containing complex oxides
- Source :
- International Journal of Hydrogen Energy. 41:3994-4004
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Quantitative analysis of Cr-adsorption from a gas phase on CeO 2 , pure and doped BaCeO 3 was performed in combination with surface techniques and electrochemical impedance spectroscopy. The Cr-adsorption on BaCeO 3 is 3 times higher than on CeO 2 and it increases by 12–25% on In doping in Ba(Ce 1−x In x )O 3 (x = 0.1–0.3) in the temperature range of 600–700 °C. These perovskites adsorb chromium with the formation of a multi-phase surface layer containing BaCr 6+ O 4 and cerium oxide. Coexistence of small fractions of Cr 3+ and Cr 5+ cations in the surface layer was identified by X-ray photoelectron spectroscopy. The thickness of the surface layer and its morphology vary with temperature, affecting the conductivity of Ce containing perovskites below 700 °C. BaCrO 4 exhibits under air noticeably larger anisotropic thermal expansion than BaCeO 3 . The results indicate that high tolerance to Cr-gaseous species should be considered as an important criterion for further development of materials for proton-conducting SOFCs.
- Subjects :
- Cerium oxide
Materials science
Renewable Energy, Sustainability and the Environment
Doping
Inorganic chemistry
Analytical chemistry
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
Atmospheric temperature range
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Dielectric spectroscopy
Chromium
Fuel Technology
Adsorption
chemistry
X-ray photoelectron spectroscopy
Surface layer
0210 nano-technology
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........7f8b064d64d111404015af33505058c2