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Hydrothermal synthesis of ZnO-doped ceria nanorods: effect of ZnO content on the redox properties and the CO oxidation performance

Stefa Sofia, Lykaki Maria, Binas Vassilios, Pandis Pavlos, Stathopoulos Vassilis, Konsolakis Michail

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Year 2020
Type of Item Peer-Reviewed Journal Publication
Bibliographic Citation S. Stefa, M. Lykaki, V. Binas, P. K. Pandis, V. N. Stathopoulos, and M. Konsolakis, “Hydrothermal synthesis of ZnO-doped ceria nanorods: effect of ZnO content on the redox properties and the CO oxidation performance,” Appl. Sci., vol. 10, no. 21, Nov. 2020. doi: 10.3390/app10217605
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The rational design of highly efficient, noble metal-free metal oxides is one of the main research priorities in the area of catalysis. To this end, the fine tuning of ceria-based mixed oxides by means of aliovalent metal doping has currently received particular attention due to the peculiar metal-ceria synergistic interactions. Herein, we report on the synthesis, characterization and catalytic evaluation of ZnO–doped ceria nanorods (NR). In particular, a series of bare CeO2 and ZnO oxides along with CeO2/ZnO mixed oxides of different Zn/Ce atomic ratios (0.2, 0.4, 0.6) were prepared by the hydrothermal method. All prepared samples were characterized by X-ray diffraction (XRD), N2 physisorption, temperature-programmed reduction (TPR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The CO oxidation reaction was employed as a probe reaction to gain insight into structure-property relationships. The results clearly showed the superiority of mixed oxides as compared to bare ones, which could be ascribed to a synergistic ZnO–CeO2 interaction towards an improved reducibility and oxygen mobility. A close correlation between the catalytic activity and oxygen storage capacity (OSC) was disclosed. Comparison with relevant literature studies verifies the role of OSC as a key activity descriptor for reactions following a redox-type mechanism.

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