Jump to main content
Jump to site search


Structure-activity relationship of nanostructured ceria for the catalytic generation of hydroxyl radicals

Abstract

Reactive oxygen species (ROS) are powerful oxidants generated in both biological systems and natural environments. Though enzyme-mimic activity and Fenton-like reactions have been postulated to explain how ceria nanoparticles and ROS involve in the catalytic decomposition of hydrogen peroxide (H2O2), the corresponding reaction kinetics for this reaction have yet been completely resolved. Here we present our investigation of the structure-activity relationship of ceria nanostructures for the generation of hydroxyl radicals through the catalytic decomposition of H2O2. Different nanostructured ceria including nanorods (NR), nanocubes (NC), and nanooctahedra (NO), together with commercial ceria, were examined to elucidate the relationship between morphology and the reaction kinetics. Initial relative production rates of hydroxyl radicals over different ceria nanostructures were determined using fluorescence measurements and were applied to obtain the apparent activation energy for their intrinsic activity comparisons. The activity trend of order: ceria NR > ceria NC > ceria NO > commercial ceria was observed. This trend was rationalized and assessed using activity descriptive factors including the intensity ratio of Raman bands of vibration modes due to atomic defects, the percentage of surface Ce3+ content, and the average coordination number of oxygen anions surrounding each cerium cation in the ceria samples.

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Nov 2018, accepted on 09 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09393H
Citation: Nanoscale, 2019, Accepted Manuscript

  •   Request permissions

    Structure-activity relationship of nanostructured ceria for the catalytic generation of hydroxyl radicals

    T. J. Fisher, Y. Zhou, T. Wu, M. Wang, Y. Soo and C. L. Cheung, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR09393H

Search articles by author

Spotlight

Advertisements