The investigation of optical and photocatalytic properties in Dy2 M2 O7 (M=Hf, Zr and Ce)
Título del documento: The investigation of optical and photocatalytic properties in Dy2 M2 O7 (M=Hf, Zr and Ce)
Revista: Revista mexicana de física
Base de datos:
Número de sistema: 000592440
ISSN: 0035-001X
Autores: 1
1
1
1
1
2
Instituciones: 1Mohammed V University of Rabat, Faculté des Sciences, Marruecos
2Hassan II Academy of Science and Technology, Rabat. Marruecos
Año:
Periodo: Ene-Feb
Volumen: 69
Número: 1
País: México
Idioma: Inglés
Resumen en inglés This paper aims to present a group of compounds Dy2M2O7 (with M = Hf, Ce and Zr) which could be an alternative having the same function as TiO2. Based on our studies and those reported in the literature, we will discuss in detail the roles and the functional mechanism of the catalysts. The results show that Zr2Dy2O7 is the best candidate to be a photo-catalyst: it has a band gap close to 2.2 eV, and a good absorption in visible range compared to the other compounds having absorption in UV. The quantum efficiency of Zr2Dy2O7 reaches up to 3%, and the conduction and valence band limits are localized in a potential redox zone. Doping with Cerium gives another energy level, which allows having other optical transitions and improving the absorption and reaching the quantum efficiency to 4% in a visible range.
Keyword: DFT,
Photocatalysis,
Optical properties,
Quantum efficiency,
Potential redox
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