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Research Article

Tunable catalytic activity of gadolinium-doped ceria nanoparticles for pro-oxidation of hydrogen peroxide

Anuja Bhalkikar1, Tai-Sing Wu2, Tamra J. Fisher1, Anandakumar Sarella3, Dawei Zhang4, Yi Gao4, Yun-Liang Soo2,5, Chin Li Cheung1( )
Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
Department of Physics, "National Tsing Hua University", Hsinchu 30013, Taiwan, China
Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NEB 68588, USA
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
"National Synchrotron Radiation Research Centre", Hsinchu 30076, Taiwan, China
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Abstract

We report a study of the roles of gadolinium(III) (Gd3+) dopants in influencing the catalytic activity of gadolinium-doped ceria nanoparticles towards the pro-oxidation of hydrogen peroxide to hydroxyl radicals. These doped ceria nanoparticles with dopant concentrations of 0.6 wt.%, 3 wt.%, and 6 wt.% Gd3+ were synthesized using an ozone-mediated method for tuning their catalytic activities. The Gd dopants were found to foster an increase in the percentage of Ce3+ ions in the doped ceria nanoparticles. Our reaction kinetic study revealed that the relationship between the overall reaction rates and the Gd dopant concentrations in our doped materials followed a volcano-like trend. In contrast, the apparent activation energy values of these Gd-doped ceria nanoparticles were found to be positively associated with the concentrations of Gd dopants. The overall catalytic activity trend was attributed to the interplay between the promotion and degradation effects of the Gd dopants on the properties of doped ceria nanoparticles.

Keywords

ceriacerium oxidegadoliniumpro-oxidationhydrogen peroxidehydroxyl radicalsozone

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Nano Research
Volume 13 Issue 9,
September 2020
Pages 2384-2392
DOI: 10.1007/s12274-020-2861-2
Cite this article:
Bhalkikar A, Wu T-S, Fisher TJ, et al. Tunable catalytic activity of gadolinium-doped ceria nanoparticles for pro-oxidation of hydrogen peroxide. Nano Research, 2020, 13(9): 2384-2392. https://doi.org/10.1007/s12274-020-2861-2
Topics:
Activation energyCatalytic oxidation Cerium oxideFree radical reactionsGadolinium compoundsHydrogen peroxideNanoparticlesOxidationPeroxidesReaction ratesSemiconductor dopingSynthesis (chemical)

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Received: 30 October 2019
Revised: 14 April 2020
Accepted: 08 May 2020
Published: 09 June 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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