PHOTOCATALYTIC HYDROGEN EVOLUTION ACTIVITY OF ANATASE-BROOKITE NANOPARTICLES MODIFIED WITH RARE EARTH METALS (GD, LU, TM, TB, PR)

1,2 KHALIAVKA Tetiana
Co-authors:
3 SHCHERBAN Nataliya 3 KORZHAK Ganna 3 YAREMOV Pavel 3 KOPA Ivan 1 BURVE Regina 1 COŞKUN Elif 1 GRIVEL Jean-Claude
Institutions:
1 Technical University of Denmark, Department of Energy Conversion and Storage, Lyngby, Denmark, EU, tekha@dtu.dk
2 Institute for Sorption and Problems of Endoecology NASU, Kyiv, Ukraine, EU
3 L.V. Pisarzhevskii Institute of Physical Chemistry NASU, Kyiv, Ukraine, EU
Conference:
16th International Conference on Nanomaterials - Research & Application, OREA Congress Hotel Brno, Czech Republic, EU, October 16 - 18, 2024
Proceedings:
Proceedings 16th International Conference on Nanomaterials - Research & Application
Pages:
88-94
ISBN:
978-80-88365-24-2
ISSN:
2694-930X
Published:
28th February 2025
Metrics:
48 views / 24 downloads
Abstract

Rare earth elements (Gd, Lu, Tm, Tb, Pr) modification effects on two-phased TiO2 (anatase-brookite) were analyzed. The powders were synthesized by a one-step hydrothermal method. The phase composition, crystalline size, and shape of the samples were studied by X-ray diffractometry, transmission and scanning electron microscopies, and energy-dispersive X-ray spectroscopy. The decrease of the crystallite size and increase of the lattice strain due to the modification were confirmed by the Scherrer, modified Scherrer, Williamson-Hall, Size-strain plot (SSP), and Halder-Wagner methods. The textural characteristics of the samples were determined from N2 adsorption-desorption isotherms using the methods of Brunauer–Emmet–Teller and Barret–Joiner–Halenda and revealed their mesoporous structure. UV-Vis diffuse reflectance spectra of the modified samples showed a blue shift compared to the unmodified sample. The values of band gap energy of the modified powders increased due to a phenomenon of quantum confinement or size quantization. The modification with rare earth elements improved the photocatalytic activity of the anatase-brookite composite in the hydrogen evolution reaction, which was ascribed to physico-chemical properties.

Keywords: Rare earth elements, anatase-brookite nanoparticles, photocatalysis, hydrogen

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