A facile one step route to synthesize WO 3 nanoplatelets for CO oxidation and photodegradation of RhB: microstructural, optical and electrical studies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue RSC Advances Année : 2016

A facile one step route to synthesize WO 3 nanoplatelets for CO oxidation and photodegradation of RhB: microstructural, optical and electrical studies

Résumé

Two-dimensional nanoplatelets of tungsten trioxide (NP-WO3) were synthesized at room temperature, using a wet chemical method, without any surfactants or templates; aqueous mineralization was obtained by simply adjusting the pH. The resulting nanostructures were characterized using X-ray diffraction combined with Rietveld refinements, Raman and UV-Vis spectroscopies. Their morphologies and sizes were analyzed by scanning and electron microscopies. The electrical, optical, catalytic and photocatalytic properties of the NP-WO3 nanoplatelets were then determined and compared to the ones of pseudospherical (PS-WO3) standard samples. Nanoplatelets as well as pseudospherical particles crystallized in the single orthorhombic WO3 phase. The Rietveld refinement calculations and HRTEM analyses revealed a strong distortion of the WO6 octahedra, according to the W-O splitting. The electrical conductivity of WO3 compact pellets showed that both samples were semi-conducting with a weak difference in activation energies. Using a homemade photocatalytic device, the NP-WO3 particles used as photocatalyst in an aqueous medium, exhibited a significant efficiency to decompose rhodamine B over their large exposed surface (010), compared to PS-WO3 particles. These NP-WO3 particles were also used as the catalytic material for oxidation in an air-CO gas flow. They exhibited catalytic activity higher than the one in the PS form.

Domaines

Matériaux Catalyse
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Dates et versions

hal-01872755 , version 1 (12-09-2018)

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Citer

N. Dirany, Madjid Arab, V. Madigou, Christine Leroux, J. Gavarri. A facile one step route to synthesize WO 3 nanoplatelets for CO oxidation and photodegradation of RhB: microstructural, optical and electrical studies. RSC Advances, 2016, 6 (73), pp.69615 - 69626. ⟨10.1039/c6ra13500e⟩. ⟨hal-01872755⟩
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