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Article Dans Une Revue Journal of Materials Chemistry Année : 2012

Nanocrystalline N-doped ceria porous thin films as efficient visible-active photocatalysts

Résumé

Nanocrystalline porous N-doped ceria films have been prepared by combining sol–gel chemistry, evaporation-induced self-assembly (EISA), flash crystallization and treatment in NH3 gas between 550 and 700 °C at flow rates of 270 and 670 cm3 min−1. The maximum nitrogen uptake is 0.06 moles per Ce, observed for the sample treated at 600 °C and NH3 flow rate of 670 cm3 min−1. Nitrogen bonding to cerium is proved by XPS, through the observation of the characteristic Ce–N feature at ∼397 eV. Microstructural characterization shows that the mesostructure of the films is lost for treatment temperatures in ammonia higher than 550 °C but the porous fraction remains between 35 and 40% after ammonolysis for all the samples. The nitrided films show photocatalytic activity under visible light in the acetaldehyde decomposition, with the best results obtained for the films treated at 550 °C under NH3 flow rate of 670 cm3 min−1.

Domaines

Matériaux
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Dates et versions

hal-01468498 , version 1 (15-02-2017)

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Citer

A. Belén Jorge, Yoshiaki Sakatani, Cédric Boissière, Christel Laberty-Roberts, Guillaume Sauthier, et al.. Nanocrystalline N-doped ceria porous thin films as efficient visible-active photocatalysts. Journal of Materials Chemistry, 2012, 22 (7), pp.3220-3226. ⟨10.1039/c2jm15230d⟩. ⟨hal-01468498⟩
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