Comparative Study of Physicochemical Properties of Finely Dispersed Powders and Ceramics in the Systems CeO2–Sm2O3 and CeO2–Nd2O3 as Electrolyte Materials for Medium Temperature Fuel Cells

Finely dispersed (CeO2)1−x(Sm2O3)x (x = 0.05, 0.10, 0.20) and (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders were synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and were used to obtain ceramic materials comprising fluorite-like solid solutions with...

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Bibliographic Details
Published in:Ceramics 2023-06, Vol.6 (2), p.1210-1226
Main Authors: Kalinina, Marina V., Dyuskina, Daria A., Mjakin, Sergey V., Kruchinina, Irina Yu, Shilova, Olga A.
Format: Article
Language:English
Subjects:
Additives
Ceramics
Cerium oxides
co-precipitation of hydroxides
Comparative studies
density
Dispersion
Electrical resistivity
Electrolytes
Electrolytic cells
finely dispersed powders
Fluorite
Fuel cells
Hydroxides
Ion currents
Liquid phases
Molten salt electrolytes
nanoceramics
Nitrogen
Outdoor air quality
oxides
Porosity
Reagents
Sintering
Software
Solid electrolytes
Solid solutions
Synthesis
Temperature
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Summary:Finely dispersed (CeO2)1−x(Sm2O3)x (x = 0.05, 0.10, 0.20) and (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders were synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and were used to obtain ceramic materials comprising fluorite-like solid solutions with CSR in the range 69–88 nm (upon annealing at 1300 °C) and open porosity in the range 0.6–6.2%. The physicochemical properties of the synthesized materials were comparatively characterized. In general, the prepared materials were found to possess a mixed type of electrical conductivity, but in the medium-temperature range, the ionic component was predominant (ion transfer numbers ti = 0.93–0.73 at 300–700 °C). The highest ionic conductivity was observed for CeO2-based samples containing 20 mol.% Sm2O3 (σ700°C = 3.3 × 10−2 S/cm) and 15 mol.% Nd2O3 (σ700°C = 0.48 × 10−2 S/cm) was in the temperature range 500–700 °C. The physicochemical properties (density, open porosity, type and mechanism of electrical conductivity) of the obtained ceramic materials make them promising as solid oxide electrolytes for medium temperature fuel cells.
ISSN:2571-6131
2571-6131
DOI:10.3390/ceramics6020073