Control of morphology and dopant distribution in yttrium-doped ceria nanoparticles |
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| Authors: | Shao-Ju Shih Ying-Ying Wu Konstantin B Borisenko |
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| Institution: | (1) Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43 Sec. 4 Keelung Road, Taipei 106, Taiwan;(2) Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK |
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| Abstract: | The morphology and distribution of dopant in yttrium-doped ceria (YDC) nanoparticles prepared by spray pyrolysis were characterised
by transmission electron microscopy and X-ray energy dispersive spectroscopy (XEDS), respectively. By combining the XEDS analysis
and concentration distribution modelling, accurate yttrium dopant concentration variation from the particle center to the
surface can be determined. It is shown that by appropriately selecting cerium precursors, the yttrium dopant distribution
in YDC nanoparticles can be controlled. Uniform yttrium distribution in the YDC particles has been achieved, which is important
to decrease probability of yttrium cluster segregation to improve oxygen ion conductivity in solid oxide fuel cell electrolytes.
This control is based on the suggested mechanism of dopant distribution which proposes that hydration energies influence diffusion
rates of the precursors during preparation process. In addition, the morphology (solid spherical, hollow spherical and hollow
concave) formation mechanisms of the YDC particles from different cerium precursors are discussed. |
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