Improved Oxidase Mimetic Activity by Praseodymium Incorporation into Ceria Nanocubes

Abstract

Ceria nanocubes (NC) modified with increasing concentrations of praseodymium (5, 10, 15, and 20 mol %) have been successfully synthesized by a hydrothermal method. The as-synthesized Pr-modified ceria nanocubes exhibit an enhanced oxidase-like activity on the organic dye TMB within a wide range of concentrations and durations. The oxidase activity increases with increasing Pr amounts in Pr-modified ceria nanocubes within the investigated concentration range. Meanwhile, these Pr-modified ceria nanocubes also show higher reducibility than pure ceria nanocubes. The kinetics of their oxidase mimetic activity is fitted with the Michaelis-Menten equation. A mechanism has been proposed on how the Pr incorporation could affect the energy level of the bands in ceria and hence facilitate the TMB oxidation reaction. The presence of Pr species on the surface also contributes to the increasing activity of the Pr-modified ceria nanocubes present higher oxidase activity than pure ceria nanocubes.

Physicochemical properties of nanostructured Pd/lanthanide-doped ceria spheres with high catalytic activity for CH4 combustion

“…These can be attributed to the reduction of Ce 4+ to Ce 3+ on the surface and in the bulk of these materials, respectively. [30][31][32] In the traces for 1 wt% Pd/GDC (Figure 10 d) and 1 wt% Pd/PrDC (Figure 10 e), these two peaks were also observed. However, at 215-238 o C a further peak is clearly observed.…”

Determining the maximum lanthanum incorporation in the fluorite structure of La-doped ceria nanocubes for enhanced redox ability

“…It should be noted that the hydrothermal method used in ref. 25 does not include the use of a capping agent, leading to nanocubes which are much larger than the ones obtained using the synthetic approach of this study. Fig.…”

“…23 and 24 the increase in the amount of dopant induces a loss of the cubic shape as well as a modication of the nanocubes sizes. A mixture of nanocubes and nanorods has also been obtained in Praseodymium doped CeO 2 nanocubes recently investigated by L. Jiang et al, 25 for Pr doping higher than 15%. It should be noted that the hydrothermal method used in ref.…”

Colloidal Surface Engineering: Growth of Layered Double Hydroxides with Intrinsic Oxidase‐Mimicking Activities to Fight Against Bacterial Infection in Wound Healing

“…For further analyze the catalytic Table S2, Supporting Information). [48,49] It is known that the K m value reflects the affinity of a natural enzyme for a substrate, and a lower K m value indicates a higher affinity between the substrate and enzyme. [50,51] Compared with 15% Pr-CeO 2 , the affinity of the as-prepared hollow Mn/Ni LDHs for TMB was strengthened by at least 21%, which may be attributed to the unique hierarchical structure.…”