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Journal of Dispersion Science and Technology Volume 41, 2020 - Issue 9
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Original Articles

Fabrication of novel hierarchical CeO2 sub-micro spheres via a facile hydrothermal process

Zengyan HanSchool of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, P. R. China; View further author information
,
Ying XinSchool of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, P. R. China; Correspondence[email protected]
View further author information
,
Nana ZhangSchool of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, P. R. China; View further author information
,
Qian LiSchool of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, P. R. China; View further author information
,
Xicheng MaSchool of Chemistry and Chemical Engineering, Shandong University, Jinan, P. R. China; View further author information
,
Yongxin QiSchool of Material Science and Technology, Shandong University, Jinan, P. R. ChinaView further author information
&
Zhaoliang ZhangSchool of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan, Jinan 250022, P. R. China; Correspondence[email protected]
View further author information
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Pages 1417-1426 | Received 05 Feb 2019, Accepted 19 May 2019, Published online: 31 May 2019
 
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Abstract

Hierarchical CeO2 sub-micro spheres fabricated with nanoflakes have been successfully synthesized by a facile hydrothermal method without organic agents. The influence factors of the type of precipitant, amount of H2O2, as well as reaction times and temperatures have been thoroughly investigated. The as-prepared hierarchical CeO2 sub-micro spheres are characterized by X-ray diffraction (XRD), scan electron microscopy (SEM) and transmission electron microscopy (TEM). The CeO2 sub-micro spheres are composed of the aggregated CeO2 nanoflakes. The conceivable formation mechanism of hierarchical CeO2 nanospheres is proposed involving a self-assembly-oriented aggregation induced by urea and Ostwald ripening. The hierarchical CeO2 sub-micro spheres exhibit improved activity for the conversion of CO to CO2 in comparison with CeO2 nanoparticles.

Graphical Abstract

Additional information

Funding

This work was supported by National Natural Science Foundation of China (No. 21876061).

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