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Morphology-Controllable Synthesis of Mesoporous CeO2 Nano- and Microstructures
Abstract
Spherical cerium oxide nanoparticles and microsized rod-shaped and spindle-like CeO 2 structures have been synthesized using a polyol method. When the duration of reaction and the concentration of cerium precursor are controlled, CeO 2 products of different morphologies can be selectively produced. Results from XRD, XPS, SEM, and FT-IR measurements suggest that the CeO 2 nanospheres are formed from the decomposition of the cerium precursor. Further reactions between the as-prepared CeO 2 and ethylene glycol yield the rods/spindle-like cerium formate particles. These morphologies are preserved even after calcination. The order of band gap energy of these samples was found to be rod-shaped > spherical > spindle-like samples, as determined by the UV−Vis spectroscopic method. Compared to a nonoriented polycrystalline CeO 2, these samples show an increase in band gap energy due to the quantum size effect. The higher catalytic activity on CO conversion in a spindle-like sample can be explained from the extent of Ce(IV) reduction and the oxygen vacancy.
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Metadata
- Authors
- Ho, C., Yu, J. C., Kwong, T., Mak, A. C., & Lai, S.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-07-22
- Volume
- 17
- Issue
- 17
- Pages
- 4514-4522
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W1964000069
- Cited by
- 560
- References
- 42
- FWCI
- 11.69
- Type
- journal article
- Language
- en
- Open access
- closed
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