Surface and structural characterization of Cu-exchanged hydroxyapatites and their application in H2O2 electrocatalytic reduction

Guillermo Escolano Casado, Pavlo Ivanchenko, Geo Paul, Chiara Bisio, Leonardo Marchese, Amir M. Ashrafi, Vedran Milosavljevic, Lorenzo Degli Esposti, Michele Iafisco, Lorenzo Mino

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

We report on the preparation of hydroxyapatite (HA) nanoparticles with high specific surface area, terminated with calcium-rich {0 1 0} facets, and their subsequent surface functionalization with copper by cationic exchange with copper nitrate solutions at different concentrations. Elemental analysis highlighted a progressive increase of the amount of copper incorporated into the HA, reaching a maximum of ∼ 7 wt%. A combined X-ray diffraction and solid-state NMR investigation showed no significant structural differences after the Cu functionalization, confirming that the copper exchange occurs mainly at the surface until saturation and, for the higher Cu concentrations, also in the sub-surface/bulk layers of the material, without altering the HA crystal structure. The gradual substitution of surface Ca2+ by Cu2+ was studied also by IR spectroscopy using carbon monoxide as probe molecule. Finally, we assessed the catalytic activity of the materials testing the electrochemical reduction of H2O2 by cyclic voltammetry. We observed a progressive increase in catalytic activity correlated with the amount of Cu, suggesting the possible application of copper-exchanged HA as electrochemical H2O2 sensors.

Lingua originaleInglese
Numero di articolo153495
RivistaApplied Surface Science
Volume595
DOI
Stato di pubblicazionePubblicato - 1 set 2022

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