Characteristics of CeO₂ Nanocubes and Related Polyhedra Prepared by Using a Liquid−Liquid Interface

Abstract

Monodispersed CeO2 nanocubes were prepared by using a liquid−liquid interface. The morphology of CeO2 nanocrystals from the aqueous phase changed from truncated octahedron to nanocube in the toluene phase at the water−toluene interface. The CeO2 nanocubes oriented to form large cubic particles at a low molar ratio of oleic acid (OLA)/Ce. The red-shift of the absorption edge and the high concentration of Ce3+ in the CeO2 structure was identified for the CeO2 nanocrystals. The high concentration of Ce3+ in the CeO2 structure was identified as one of the main reasons for the red-shift of the absorption edge of CeO2 nanocrystals.

Morphological impact of manganese–cerium oxides on ethanol oxidation

“…This agrees well with the general understanding that the {100} plane has the highest surface energy compared with other low indexed facets like {110} and {111}. [15][16][17] This highly reactive surface is chemically originated from the instability of the top-layer oxygen, which is located at the bridging position between two cerium ions. 18 The catalytic properties of the MnO x -CeO 2 nanomaterials were investigated for ethanol oxidation.…”

Fabricated CeO2 nanopowders as a novel sensing platform for advanced forensic, electrochemical and photocatalytic applications

“…Figure 15a shows the PL emission spectra of asformed CeO 2 NPs prepared with various fuel concentration under k Exc = 386 nm. The spectra exhibits peaks at * 362, 391 and 441 nm may be attributed to surface defects, charge transition from the 4f band to the valence band of CeO 2 and oxygen vacancies (Li et al 2008;Dang et al 2010;Luo et al 2015). The emission spectra of calcined CeO 2 NPs excited under 386 nm wavelength as shown in Fig.…”

Tuning the Morphology of Metal Oxides for Catalytic Applications

“…The primary synthesis strategy is hydrothermal and/or solvothermal processes. 286,290,[292][293][294][295][296][297][298][299][300] Among them, a facile alkali-assisted hydrothermal process produced CeO 2 nanocubes of 20-50 nm (Figure 10.27), 280 and the sizes of the cubes could be further tailored in a wide range of 20-360 nm by simply adjusting the synthetic parameters. 293 But these cubes are too large to demonstrate appreciable effect in catalytic reactions.…”

“…For example, ceria nanocubes with uniform sizes of about 5 nm and 10 nm were prepared using oleic acid as the structure-directing agent. 286,296,298 Recently, single-crystalline ceria nanocubes of about 10 nm with (100) facets were fabricated using a supercritical hydrothermal process. 299 This cubic nanostructure had surprisingly high extra-low-temperature OSC, demonstrating the potential to be a superior catalyst.…”