X-ray diffraction analysis of titanium hydrides in commercial titanium alloys

Ageev, N.V.; Babareko, A. A.; Rubina, E. B.; Betsofen, S. Ya.; Bunin, L. A.

doi:10.1007/bf00664146

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…12 SHT treatment causes appearance of anatase and small amounts of rutile in addition to metallic titanium. By contrast, the intensity of titanium hydride patterns is strongly reduced.…”

Section: Vis/nirmentioning

confidence: 99%

“…Recently, it was shown that such a sonohydrothermal treatment (SHT) accelerates the crystallization and improves the catalytic performance of nanocrystalline metal oxides 11. The experimental details about the SHT reactor are presented in the Supporting Information (FigureS1).The passivated Ti particles exhibit XRD patterns of metallic titanium with admixtures of tetragonal titanium hydride TiH x (x = 1.53−1.97) (Figure1a), which is typical for commercial titanium powders 12. SHT treatment causes appearance of anatase and small amounts of rutile in addition to metallic…”

mentioning

confidence: 97%

“…The passivated Ti particles exhibit XRD patterns of metallic titanium with admixtures of tetragonal titanium hydride TiH x (x = 1.53−1.97) (Figure 1a), which is typical for commercial titanium powders. 12 SHT treatment causes appearance of anatase and small amounts of rutile in addition to metallic titanium. By contrast, the intensity of titanium hydride patterns is strongly reduced.…”

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confidence: 99%

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Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation

et al. 2015

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Limiting resources of fossil fuels and environmental issues inevitably require more efficient utilization of solar energy. Photocatalytic production of hydrogen is identified as one of the most promising routes for developing clean and sustainable energy. However, engineering of low-cost materials exhibiting high catalytic activity in the entire range of solar spectrum is still a challenge. Here we report, for the first time, simple, easily scalable and environmentally friendly synthesis of stable Ti@TiO 2 core-shell nanoparticles exhibiting photocatalytic activity in hydrogen production under Vis/NIR light irradiation without any noble metals. Stable to oxidation core-shell Ti@TiO 2 nanoparticles have been obtained by the simultaneous actions of ultrasound and hydrothermal treatment on air-passivated titanium metal nanoparticles in pure water. The obtained material is composed of quasi-spherical Ti particles (20-80 nm) coated by 5-15 nm crystals of defect-free anatase with small amounts of rutile. In contrast to pristine TiO 2 , the Ti@TiO 2 nanoparticles extend the photo response from UV to NIR light region due to the light absorption by nonplasmonic Ti core. In MeOH-H 2 O solutions, the Ti@TiO 2 nanoparticles exhibit the strongest catalytic activity in H 2 formation under joint effect of Vis/NIR light and heat. Isotopic study using MeOH-D 2 O solutions suggested the reaction mechanism involving electron holes accumulation in semiconducting TiO 2 shell via charge separation and multiple charge-transfer steps that follow Ti interband transition. The electron transport from Ti core presumably occurs through the junctions between TiO 2 crystals at the surface of core-shell nanoparticles.

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“…12 SHT treatment causes appearance of anatase and small amounts of rutile in addition to metallic titanium. By contrast, the intensity of titanium hydride patterns is strongly reduced.…”

Section: Vis/nirmentioning

confidence: 99%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation

et al. 2015

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“…XRD diagram of air passivated Ti NPs in Figure 3A displays the patterns of metallic α-phase titanium (JCPDS 00-044-1294) with admixtures of tetragonal non-stoichiometric titanium hydride TiH x (x = 1.53 -1.97, JCPDS 01-079-6209) as it often observed in commercial titanium powders (Ageev et al, 1976). However, more thoughtful analysis of XRD data using Rietveld refinement revealed the presence of scarce Ti 3 O suboxide with P31c space group symmetry (Figures 3B,C) (Yamaguchi, 1969).…”

Section: Morphological and Structural Studiesmentioning

confidence: 99%

Tailoring Noble Metal-Free Ti@TiO2 Photocatalyst for Boosting Photothermal Hydrogen Production

et al. 2021

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In this work, we provide new insights into the design of Ti@TiO2 photocatalyst with enhanced photothermal activity in the process of glycerol reforming. Ti@TiO2 nanoparticles have been obtained by sonohydrothermal treatment of titanium metal nanoparticles in pure water. Variation of sonohydrothermal temperature allows controlling nanocrystalline TiO2 shell on Ti0 surface. At 100 < T < 150°C formation of TiO2 NPs occurs mostly by crystallization of Ti(IV) amorphous species and oxidation of titanium suboxide Ti3O presented at the surface of Ti0 nanoparticles. At T > 150°C, TiO2 is also formed by oxidation of Ti0 with overheated water. Kinetic study highlights the importance of TiO2 nanocrystalline shell for H2 generation. Electrochemical impedance spectroscopy points out more efficient electron transfer for Ti@TiO2 nanoparticles in correlation with photocatalytic data. The apparent activation energy, Ea = (25–31) ± 5 kJ·mol−1, assumes that photothermal effect arises from diffusion of glycerol oxidation intermediates or from water dynamics at the surface of catalyst. Under the heating, photocatalytic H2 emission is observed even in pure water.

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Probing the optimal thermohydrogen processing conditions of titanium alloy shavings via chemisorption method

Liu

Ruan

et al. 2018

International Journal of Hydrogen Energy

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X-ray diffraction analysis of titanium hydrides in commercial titanium alloys

Cited by 5 publications

References 3 publications

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation

Tailoring Noble Metal-Free Ti@TiO2 Photocatalyst for Boosting Photothermal Hydrogen Production

Probing the optimal thermohydrogen processing conditions of titanium alloy shavings via chemisorption method

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X-ray diffraction analysis of titanium hydrides in commercial titanium alloys

Cited by 5 publications

References 3 publications

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO2 Core–Shell Nanoparticles under Visible–NIR Light Irradiation

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO2 Core–Shell Nanoparticles under Visible–NIR Light Irradiation

Tailoring Noble Metal-Free Ti@TiO2 Photocatalyst for Boosting Photothermal Hydrogen Production

Probing the optimal thermohydrogen processing conditions of titanium alloy shavings via chemisorption method

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Product

Resources

About

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation

Photothermal Hydrogen Production Using Noble-Metal-Free Ti@TiO₂ Core–Shell Nanoparticles under Visible–NIR Light Irradiation