Improved Oxidase Mimetic Activity by Praseodymium Incorporation into Ceria Nanocubes
Loading...
Official URL
Full text at PDC
Publication date
2017
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Citations
Exportar
Citation
Lei Jiang, Susana Fernandez-Garcia, Miguel Tinoco, Zhaoxia Yan, Qi Xue, Ginesa Blanco, Jose J. Calvino, Ana B. Hungria, and Xiaowei Chen
ACS Applied Materials & Interfaces 2017 9 (22), 18595-18608
DOI: 10.1021/acsami.7b05036
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 Pr3+ species on the surface also contributes to the increasing activity of the Pr-modified ceria nanocubes present higher oxidase activity than pure ceria nanocubes.