La(M,Ti)(O,N)<sub>3</sub> (M = Zn, Ga) as visible light-driven photocatalyst for water splitting - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2013

La(M,Ti)(O,N)3 (M = Zn, Ga) as visible light-driven photocatalyst for water splitting

Résumé

The use of solar energy is of highest interest from a low environmental impact viewpoint, and nowadays the photocatalytic splitting of water under solar radiations is a challenging and promising domain of research to provide clean and renewable H2 as an alternative energy resource [1]. Current oxide photocatalysts (TiO2 , ZnO, SrTiO3 , NaTaO3 ...) are wide-gap semiconductors for which UV-light is necessary to produce electron-hole pairs by photoexcitation. Therefore, the development of visible-light-driven photocatalysts for overall water splitting is currently attracting much attention as a potential efficient utilization of solar energy. So far the (oxy)nitride approach become attractive and promising for this specific issue as a consequence of the anionic N3-/O2- substitution results in an increase of the covalent character which is illustrated by a shift of the absorption edge towards higher wavelength values (band gap < 3 eV). However other requirements have to be considered to synthesize an efficient visible-light-driven photocatalyst such as the mobility of the photogenerated charge carriers, the crystal structure or the chemical stability. Perovskite-type oxynitrides containing lanthanides and d0 metal ions such as LaTiO2N exhibit interesting photocatalytic behavior as well as d10 -type metal oxynitrides and sulfides, for instance (Zn,Ga)(O,N) and ZnS systems. Here, we have studied the monoclinic perovskite-type oxynitride system La2M1-xTi1+x(O,N)6 (M = Zn, Ga). It is expected that the expanded nature of the ns band of the d10 metals improves the mobility of the photogenerated carriers thus enhancing the photocatalytic activity of the material [2]. The effect of the M/Ti substitution on the photocatalytic decomposition of water is investigated.

References :
[1] K. Maeda, J. Photochem. Photobiol. C: Photochem. Reviews 58-59 (2011) p. 443-446
[2] J. Yin, Z. Zou, J. Ye, J. Phys. Chem. B 108 (2004) p. 12790-12794

Domaines

Chimie Matériaux
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hal-01263666 , version 1 (28-01-2016)

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  • HAL Id : hal-01263666 , version 1

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Vincent Michel, François Cheviré, Franck Tessier, Takashi Hisatomi, Jun Kubota, et al.. La(M,Ti)(O,N)3 (M = Zn, Ga) as visible light-driven photocatalyst for water splitting. ISIEM 2013 - International Symposium on Inorganic and Environmental Materials, Oct 2013, Rennes, France. ⟨hal-01263666⟩
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