Abstract
Ce0.8Pr0.2OY solid solutions with ultrafine crystalline sizes and high specific surface area were prepared by an improved citrate precursor method, where a nitrogen treatment was added prior to calcinations in air. The samples were characterized by TG-DSC, Raman spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET nitrogen adsorption. XRD and Raman results show that the formation of Ce0.8Pr0.2OY solid solutions typical of the fluorite-like cubic structure with oxygen vacancies occurs when the Ce–Pr citrate precursors are heated at high temperature in the nitrogen atmosphere. Subsequent calcinations at a low temperature in air to remove carbon species have no apparent effects on the formed solid solutions. Ce0.8Pr0.2OY solid solution prepared by the improved citrate precursor method at 800°C has ultrafine nanoparticles of less than 10 nm and high specific surface area of 92.1 m2/g, while the sample prepared by the conventional citrate precursor method has mean particle size of 62.1 nm and specific surface area of 18.1 m2/g. Furthermore, Ce–Pr solid solution by the improved method have the mesoporous structure, more lattice defects and oxygen vacancies, which will have a promising application in the catalyst region as well as SOFC field.
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We gratefully acknowledge the National Nature Science Foundation of China (No. 20473075) for the financial support.
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Xie, GQ., Luo, MF., He, M. et al. An improved method for preparation of Ce0.8Pr0.2OY solid solutions with nanoparticles smaller than 10 nm. J Nanopart Res 9, 471–478 (2007). https://doi.org/10.1007/s11051-005-9052-7
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DOI: https://doi.org/10.1007/s11051-005-9052-7