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

作者：Belen Jorge A; Sakatani Yoshiaki; Boissiere Cedric; Laberty Roberts Christel; Sauthier Guillaume; Fraxedas Jordi; Sanchez Clement; Fuertes Amparo^*

来源：Journal of Materials Chemistry, 2012, 22(7): 3220-3226.

DOI：10.1039/c2jm15230d

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 degrees C at flow rates of 270 and 670 cm(3) min(-1). The maximum nitrogen uptake is 0.06 moles per Ce, observed for the sample treated at 600 degrees C and NH3 flow rate of 670 cm(3) min(-1). Nitrogen bonding to cerium is proved by XPS, through the observation of the characteristic Ce-N feature at similar to 397 eV. Microstructural characterization shows that the mesostructure of the films is lost for treatment temperatures in ammonia higher than 550 degrees 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 degrees C under NH3 flow rate of 670 cm(3) min(-1).

• 出版日期2012