Publication detail

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.

Original Title

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

Type

journal article in Web of Science

Language

English

Original 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.

Keywords

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

Authors

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

Released

1. 9. 2022

ISBN

0169-4332

Periodical

Applied Surface Science

Year of study

595

Number

153495

State

Kingdom of the Netherlands

Pages from

1

Pages to

8

Pages count

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"
}