Characterization and Preparation of Ni0/Ce0.8Sm0.2O1.9 Powders by a Citric Acid-Nitrate Combustion Method

NiO/Ce0.8Sm0.2O1.9 (NiO/SDC) powders were prepared by a citric acid-nitrate combustion method with different mole ratios of citric acid to metal ions (MRCM) in the precursor solutions. Phase composition and morphology of the powders were investigated by XRD,TEM and laser diffraction analysis,et al. Specific surface area and average particle size of the NiO/SDC powders with different dispersants in the precursor solutions were also measured by a BET method. The results show that the MRCM has a significant effect on the particle size of the obtained NiO/SDC powders. The average crystallite size of NiO and SDC are 10.42nm and 6.91nm, respectively, in the NiO/SDC powders for a MRCM of 1.5. The powders show good dispersion with a high surface area and small particle size. The adding of dispersants into the precursor solutions can effectively reduce the aggregation of the NiO/SDC powders. Especially, PEG6000 shows best dispersion effect for the NiO/SDC powders.