Cerium
dioxide is a scientifically and technologically important
material with a wide range of potential applications, particularly
in solid oxide fuel cells and catalysis. Herein, we report a study
focusing on the synthesis of nanocrystalline cerium dioxide via thermal
decomposition of the oxalate salt. Simply by changing reaction conditions
(temperature, concentration, acidity, strike) during the precipitation
of the cerium solution with oxalic acid, we were able to obtain different
morphologies. The main reaction parameters were mapped and linked
to the morphology of the final products. Additionally, it was proved
that oxalate precipitation is a robust reaction proceeding at relatively
extreme contitions. Moreover, the conversion of cerium oxalate to
nanocrystalline oxide was followed to monitor the progress of the
reaction, the texture evolution, and the grain growth. The results
showed that, for unvaried heating cycle, the grain size of converted
material is linked to morphology. The thinner was the original microcrystal
the smaller were the CeO2 nanocrystals after calcination.
In addition, the grains were found smaller near the edges of the ex-oxalate
microcrystals. In both cases, this behavior results from asymmetrical
limitations of diffusion during grain growth.
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