Structural Properties, Morphology, Total Conductivity and Oxygen Mobility of Composite Materials Based on Bi Cerates Full article
| Journal |
Chimica Techno Acta
, E-ISSN: 2411-1414 |
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| Output data | Year: 2025, Volume: 12, Number: 4, Article number : 9074, Pages count : 13 DOI: 10.15826/chimtech.9074 | ||||
| Tags | fluorites; Bi cerates; composites; impedance spectroscopy; isotope heteroexchange; oxygen mobility | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 23-73-00045 |
Abstract:
Search of the new composite materials with mixed oxide-ionic–electronic conductivity and studies of their characteristics are important problems in the development of oxygen separation membranes as parts of catalytic reactors for biofuel transformation into syngas. Such composites are generally based on complex oxides with perovskite, fluorite, pyrochlore structure, etc. In this work, composites based on Bi cerates, Y-doped ceria and Pr nickelate-cobaltite are synthesized and studied. The composites are synthesized via ultrasonic dispersion in isopropanol. The obtained materials are characterized by X-ray diffraction, scanning and high resolution transmission electron microscopy. Electrical conductivity of the composites is studied by impedance spectroscopy. Oxygen transport properties are investigated by isotope exchange of oxygen with C18O2 in a flow reactor. The samples are comprised of fluorite, perovskite and, sometimes, pyrochlore phases and various admixtures with different compositions, apparently, due to cation redistribution and solid state reactions between phases. The total conductivity of samples is ~10−1 S/cm at 600 °C, which is high enough for using in the oxygen separation membranes. According to the isotope exchange data, the samples possess high oxygen mobility and surface reactivity. There is a distinct nonuniformity in the oxygen mobility, which is related to the effect of fast diffusion of oxygen associated with Bi and Ce cations, as well as the features of phase composition and real/defect structure. This makes the composites studied promising for using in the oxygen separation membranes.
Cite:
Eremeev N.
, Mironov S.
, Sadovskaya E.
, Krieger T.
, Ishchenko A.
, Ulikhin A.
, Sadykov V.
, Bespalko Y.
Structural Properties, Morphology, Total Conductivity and Oxygen Mobility of Composite Materials Based on Bi Cerates
Chimica Techno Acta. 2025. V.12. N4. 9074 :1-13. DOI: 10.15826/chimtech.9074
Structural Properties, Morphology, Total Conductivity and Oxygen Mobility of Composite Materials Based on Bi Cerates
Chimica Techno Acta. 2025. V.12. N4. 9074 :1-13. DOI: 10.15826/chimtech.9074
Dates:
| Submitted: | Sep 4, 2025 |
| Accepted: | Oct 6, 2025 |
| Published online: | Oct 10, 2025 |
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