Relationship among the composition, synthesis conditions, and surface acid-basic properties of xerogel particles based on zirconium dioxide

Fedorenko, N. Yu.; Mjakin, S. V.; Хамова, Т. В.; Калинина, М. В.; Шилова, О. А.

doi:10.1016/j.ceramint.2021.11.165

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…The surface functionality of the prepared samples was studied using a dynamic pHmetry technique [24,25]. The acid-base properties of the powder surface were characterized by measuring the changes in pH value of the suspensions obtained by immersing 30 mg of the studied powders in 30 mL of distilled water at permanent agitation with a magnetic stirrer.…”

Section: Characterization Methodsmentioning

confidence: 99%

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

et al. 2023

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Finely dispersed (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders are synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and co-crystallization of nitrates. The prepared powders are used to obtain ceramic materials comprising fluorite-like solid solutions with the coherent scattering region (CSR) of about 88 nm (upon annealing at 1300 °C) and open porosity in the range of 1–15%. The effect of the synthesis procedure and sintering additives (SiO2, ZnO) on physicochemical and electrophysical properties of the resulting ceramics is studied. The prepared materials are found to possess a predominantly ionic type of electric conductivity with ion transfer numbers ti = 0.96–0.71 in the temperature range of 300–700 °C. The conductivity in solid solutions follows a vacancy mechanism with σ700 °C = 0.48 × 10−2 S/cm. 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.

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Section: Characterization Methodsmentioning

confidence: 99%

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

et al. 2023

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“…The surface functionality of the prepared samples was studied using a dynamic pHmetry technique [26,27]. The acid-base properties of the powder surface were characterized by measuring the changes in the pH value of the suspensions obtained by immersing 30 mg of the studied powders in 30 mL of distilled water at permanent agitation with a magnetic stirrer.…”

Section: Characterization Methodsmentioning

confidence: 99%

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

et al. 2023

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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.

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“…Another evidence for the absorption of PEI is provided by the existence of a strong shoulder at 1631 cm -1 , and it becomes weaker for the freeze-dried sample, which can be attributed to the stretching vibration of C=C (the chain belonging to PEI). The broad band from 400 cm -1 to 1000 cm -1 is assigned to the Zr-O band for t-ZrO2 [5]. Other peaks, such as those at 1203 cm -1 (due to the vibrations of C-C), 1394-1462 cm -1 (due to the symmetric vibration of the carboxylate group), and 2337 cm -1 (due to the asymmetric vibration of O=C=O), should be related to the residual dispersant of PEG4000.…”

Section: Effects Of Drying Methods and Surface Modification On The Di...mentioning

confidence: 99%

“…Zirconia (ZrO2) has received extensive attention due to its good physical and chemical properties, such as high mechanical strength, low thermal conductivity, desirable chemical stability, and excellent corrosion resistance. Based on these superior properties, zirconia nanopowder with excellent dispersion has been widely used to prepare high-performance structural and functional materials [1][2][3][4][5][6][7]. However, serious agglomeration phenomenon is often detected in ZrO2 nanoparticles synthesized by ordinary methods, such as co-precipitation [8], combustion synthesis [9], and sol-gel process [10,11], which possess high reaction temperature or high calcination temperature [12,13].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Dispersion of Yttria-Stabilized Tetragonal Zirconia Nanopowders with Microwave Solvothermal Synthesis

Wang

Guo

et al. 2022

JNanoR

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Yttria stabilized tetragonal zirconia (Y0.08Zr0.94O2, YSZ) nanopowders were successfully synthesized by microwave solvothermal method (MSM). The synthesizing temperature, holding time and mineralizer concentration were optimized. The crystallization and particle distribution of as-prepared YSZ nanopowders were identified by DSC/TG, XRD, FESEM, TEM, FTIR, DLS, and BET. The dispersion of YSZ nanopowders dried by different methods and modified by polyethyleneimine (PEI) was analyzed and discussed. The results show that the PEI modified samples have the best dispersion, and the dispersion of freeze-dried samples is better than that of traditional dried ones. The particle size of the PEI modified samples calculated from the surface area determined by BET is 15.7 nm, which is consistent with that determined by TEM (16.5 nm), but slightly smaller than that calculated by the Scherrer formula according to XRD (22.3 nm). This may be attributed to the different testing principles in these methods.

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Relationship among the composition, synthesis conditions, and surface acid-basic properties of xerogel particles based on zirconium dioxide

Cited by 12 publications

References 8 publications

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

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

Enhancing Dispersion of Yttria-Stabilized Tetragonal Zirconia Nanopowders with Microwave Solvothermal Synthesis

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