Detail publikace

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

CASADO, G.E. IVANCHENKO, P. PAUL, G. BISIO, C. MARCHESE, L. ASHRAFI, A. MILOSAVLJEVIĆ, V. DEGLI ESPOSTI, L. IAFISCO, M. MINO, L.

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

Copper-exchanged hydroxyapatites; electrocatalysis; electrochemical H2O2 sensors; FTIR spectroscopy; solid-state NMR

Autoři

CASADO, G.E.; IVANCHENKO, P.; PAUL, G.; BISIO, C.; MARCHESE, L.; ASHRAFI, A.; MILOSAVLJEVIĆ, V.; DEGLI ESPOSTI, L.; IAFISCO, M.; MINO, L.

Vydáno

1. 9. 2022

ISSN

0169-4332

Periodikum

Applied Surface Science

Ročník

595

Číslo

153495

Stát

Nizozemsko

Strany od

1

Strany do

8

Strany počet

8

URL

https://doi.org/10.1016/j.apsusc.2022.153495

BibTex

@article{BUT178620,
  author="CASADO, G.E. and IVANCHENKO, P. and PAUL, G. and BISIO, C. and MARCHESE, L. and ASHRAFI, A. and MILOSAVLJEVIĆ, V. and DEGLI ESPOSTI, L. and IAFISCO, M. and MINO, L.",
  title="Surface and structural characterization of Cu-exchanged hydroxyapatites and their application in H2O2 electrocatalytic reduction",
  journal="Applied Surface Science",
  year="2022",
  volume="595",
  number="153495",
  pages="1--8",
  doi="10.1016/j.apsusc.2022.153495",
  issn="0169-4332",
  url="https://doi.org/10.1016/j.apsusc.2022.153495"
}