Abstract
Quantitative analysis of Cr-adsorption from a gas phase on CeO2, pure and doped BaCeO3 was performed in combination with surface techniques and electrochemical impedance spectroscopy. The Cr-adsorption on BaCeO3 is 3 times higher than on CeO2 and it increases by 12–25% on In doping in Ba(Ce1−xInx)O3 (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 BaCr6+O4 and cerium oxide. Coexistence of small fractions of Cr3+ and Cr5+ 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. BaCrO4 exhibits under air noticeably larger anisotropic thermal expansion than BaCeO3. 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.
Original language | English |
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Pages (from-to) | 3994-4004 |
Number of pages | 11 |
Journal | International Journal of Hydrogen Energy |
Volume | 41 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2016 |
Externally published | Yes |
Keywords
- Acceptor doped BaCeO
- CeO
- Cr adsorption
- Effect of a surface layer on conductivity
- Proton-conducting SOFC
- Thermal expansion of BaCrO
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology