Improved Oxidase Mimetic Activity by Praseodymium Incorporation into Ceria Nanocubes.

Author(s) Jiang, L.; Fernandez-Garcia, S.; Tinoco, M.; Yan, Z.; Xue, Q.; Blanco, G.; Calvino, J.J.; Hungria, A.B.; Chen, X.
Journal ACS Appl Mater Interfaces
Date Published 2017 Jun 07

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.

DOI 10.1021/acsami.7b05036
Keywords Cerium; Oxidation-Reduction; Oxidoreductases; Praseodymium
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2017;9(22):1859518608.

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