研究目的
Investigating the structure–property correlations for LaxCe1?xO2?δ (x = 0.05, 0.15) system, focusing on their structural, catalytic, visible light driven photocatalytic properties, and ionic conductivity.
研究成果
The study demonstrated that La3+-doped ceria nanoparticles and ceramics exhibit excellent phase purity, desired stoichiometry, and enhanced functional properties including photocatalytic activity and ionic conductivity. The 15% La3+-doped ceria showed superior photocatalytic properties and highest ionic conductivity, making it promising for applications in catalysis and solid oxide fuel cells.
研究不足
The study is limited to LaxCe1?xO2?δ (x = 0.05, 0.15) system. The effects of higher doping concentrations and other dopants were not explored. The photocatalytic activity was tested only under visible light and alkaline conditions.
1：Experimental Design and Method Selection
The nanoparticles were synthesized by the co-precipitation route. The study involved structural characterization, catalytic and photocatalytic property evaluation, and ionic conductivity measurements.
2：Sample Selection and Data Sources
Samples of LaxCe1?xO2?δ (x = 0.05, 0.15) were prepared. Data was sourced from thermogravimetry, ICP-OES, XRD, Raman spectroscopy, BET analysis, H2-TPR, UV–Vis spectrophotometry, FESEM, and impedance analyzer.
3：List of Experimental Equipment and Materials
Cerium nitrate hexahydrate, lanthanum nitrate hexahydrate, aqueous NH3, Milli-Q water, MB dye, STA 449 F3 thermogravimetry unit, ICP-OES Varian 720-ES, Rigaku TTRX-III X-ray diffractometer, Confocal Raman Spectrometer STR 500 Airix, Quantachrome ASiQwin for BET analysis, Quantachrome TPRwin v3.52 for TPR, UV-2600 Shimadzu UV–Vis spectrophotometer, JEOL JSM-7100F FESEM, AUTOLAB ECO CHEMIE impedance analyzer.
4：Experimental Procedures and Operational Workflow
Nanoparticles were synthesized via co-precipitation, calcined at 850 °C, pressed into pellets, sintered at 1580 °C. Characterization included thermal analysis, elemental analysis, phase analysis, Raman analysis, surface area measurement, microstructural analysis, catalytic reduction properties, photocatalytic activity tests, and ionic conductivity measurements.
5：Data Analysis Methods
Data analysis involved calculating degradation efficiency, ionic conductivity using impedance analysis, and interpreting XRD, Raman, and SEM results.
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