Plasma electrolytic synthesis and characterization of bismuth-containing oxide films on titanium

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Bismuth-containing films on titanium were formed by single-stage plasma electrolytic oxidation (PEO) in pulsed mode in an electrolyte with dispersed particles containing metallic bismuth. The surface morphology and composition of the obtained films were studied by scanning electron microscopy, X-ray phase analysis, Energy-dispersive analysis and X-ray photoelectron spectroscopy. Modification of Ti/TiO2 films with bismuth leads to the appearance of anodic photocurrents in the visible region of the spectrum, a shift in the potentials of flat bands to the cathode region and an increase in the concentration of charge carriers. It is shown that the characteristics and properties of the obtained film composites are noticeably affected by the pulse duration t (0.02 or 0.05 s). At t = 0.02 s, films containing cubic particles with a diameter of 0.2 to 1 μm with an increased bismuth content are formed. Such films have a small band gap of 1.62 eV and exhibit the highest photoelectrochemical activity under the influence of visible light.

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Sobre autores

D. Popov

Far Eastern Federal University; Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: vasileva.ms@dvfu.ru
Rússia, Vladivostok; Vladivostok

M. Vasilyeva

Far Eastern Federal University; Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Autor responsável pela correspondência
Email: vasileva.ms@dvfu.ru
Rússia, Vladivostok; Vladivostok

V. Kuryavyi

Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: vasileva.ms@dvfu.ru
Rússia, Vladivostok

V. Korochentsev

Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: vasileva.ms@dvfu.ru
Rússia, Vladivostok

V. Egorkin

Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: vasileva.ms@dvfu.ru
Rússia, Vladivostok

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2. Fig. 1. Formation curves of samples: 1 – Ti/Bi(0.02); 2 – Ti/Bi(0.05).

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3. Fig. 2. SEM images of samples: a, c – Ti/Bi(0.02), b – Ti/Bi(0.05) and d – energy dispersive spectrum of particles.

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4. Fig. 3. X-ray photoelectron spectra of Bi4f (a, b), Ti2p (c, d) and O1s (d, f) for samples: a, c, d – Ti/Bi(0.02); b, d, f – Ti/Bi(0.05).

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5. Fig. 4. Diffuse absorption spectra of samples (a) and Tauc plots (b) for samples: 1 – Ti/Bi(0.02); 2 – Ti/Bi(0.05).

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6. Fig. 5. Photocurrent profiles under the action of UV (a) and visible (b, c) light for samples: 1 – Ti/Bi(0.02); 2 – Ti/Bi(0.05) and 3 –Ti/TiO2. a, b – without applying a potential, c – with applying a potential of 0.6 V.

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7. Fig. 6. a) Nyquist diagrams; b) Mott–Schottky diagrams for samples: 1 – Ti/Bi(0.02); 2 – Ti/Bi(0.05) and 3 –Ti/TiO2.

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