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Insights into the Photothermal Hydrogen Production from Glycerol Aqueous Solutions over Noble Metal-Free Ti@TiO 2 Core-Shell Nanoparticles

Sergey I. Nikitenko 1 Tony Chave 1 X. Le Goff 2
1 LSFC - Sonochimie dans les Fluides Complexes
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
2 L2ME - Etude de la Matière en Mode Environnemental
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : Photocatalytic production of hydrogen from renewable sources with platinum group metal‐free catalysts is of great importance for environmentally friendly energetics. Herein, Ti@TiO2 core–shell nanoparticles prepared by sonohydrothermal treatment of titanium metal nanoparticles are examined for hydrogen generation from aqueous glycerol solutions under vis/NIR light irradiation. It is shown that photocatalytic reforming of glycerol in the presence of Ti@TiO2 exhibits strong photothermal effect allowing more efficient use of solar energy. Apparent activation energy equal to E act = 27 ± 2 kJ mol−1 indicates that the thermal effect is related to the diffusion of reaction intermediates at catalyst surface rather than to the activation of chemical bonds. The photoexcitation mechanism of Ti@TiO2 particles involves interband transitions in nonplasmonic Ti metal core followed by nonradiative Landau damping. Effective electron–hole separation between Ti core and nanocrystalline TiO2 anatase shell in Ti@TiO2 nanoparticles is confirmed by photoluminescence spectroscopy. In studied system, photothermal hydrogen production is not accompanied by CO2 emission indicating that glycerol is oxidized to glyceric acid without further decarboxylation.
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https://hal.umontpellier.fr/hal-01996121
Contributeur : Xavier Le Goff <>
Soumis le : lundi 28 janvier 2019 - 10:52:47
Dernière modification le : jeudi 16 septembre 2021 - 03:15:49

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Sergey I. Nikitenko, Tony Chave, X. Le Goff. Insights into the Photothermal Hydrogen Production from Glycerol Aqueous Solutions over Noble Metal-Free Ti@TiO 2 Core-Shell Nanoparticles. Particle and Particle Systems Characterization, Wiley-VCH Verlag, 2018, 35 (10), pp.1800265. ⟨10.1002/ppsc.201800265⟩. ⟨hal-01996121⟩

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