Cerium oxide catalyzed disproportionation of hydrogen peroxide: a closer look at the reaction intermediate - CNRS - Centre national de la recherche scientifique Access content directly
Journal Articles Chemistry - A European Journal Year : 2023

Cerium oxide catalyzed disproportionation of hydrogen peroxide: a closer look at the reaction intermediate

Abstract

Cerium oxide nanoparticles (CNPs) have recently gained increasing interest as redox enzyme-mimetics to scavenge the intracellular excess of reactive oxygen species, including hydrogen peroxide (H2O2). Despite the extensive exploration of CNP scavenging activity, there remains a notable knowledge gap regarding the fundamental mechanism underlying the CNP catalyzed disproportionation of H2O2. In this Letter, we present evidence demonstrating that H2O2 adsorption at CNP surface triggers the formation of stable intermediates known as ceriumperoxo complexes (Ce-O2 2-). The cerium-peroxo complexes can be resolved by Raman scattering and UV-Visible spectroscopy. We further demonstrate that the catalytic reactivity of CNPs in the H2O2 disproportionation reaction increases with the Ce(III) fraction. The developed approach using UV-Visible spectroscopy for the characterization of Ce-O2 2-complexes can potentially serve as a foundation for determining the catalytic reactivity of CNPs in the disproportionation of H2O2.
Fichier principal
Vignette du fichier
MS+SI Finocchiario et al uploaded to HAL-Science 23-Sep-23.pdf (1.4 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-04215959 , version 1 (23-09-2023)

Licence

Identifiers

Cite

Giusy Finocchiaro, Xiaohui Ju, Braham Mezghrani, Jean-François Berret. Cerium oxide catalyzed disproportionation of hydrogen peroxide: a closer look at the reaction intermediate. Chemistry - A European Journal, 2023, pp.e202304012. ⟨10.1002/chem.202304012⟩. ⟨hal-04215959⟩
42 View
133 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More