The investigation of optical and photocatalytic properties in Dy_(2)M_(2)O_(7) (M= Hf, Zr and Ce ) (7 pages)

• H. Zaari ^[2] ; K. Ouassoul ^[2] ; F. Mezzat ^[2] ; F. Elyahyaoui ^[2] ; A. El Kenz ^[2] ; A. Benyoussef ^[1]
  1. [1] Hassan II Academy of Science and Technology

     Hassan II Academy of Science and Technology

     Marruecos

     
  2. [2] Mohammed V University of Rabat, Morocco
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 69, Nº. 1, 2023
• Idioma: inglés
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• Resumen

  • This paper aims to present a group of compounds Dy_(2)M_(2)O_(7) (with M = Hf, Ce and Zr) which could be an alternative having the same function as TiO_(2). 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 Zr_(2)Dy_(2)O_(7) 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 Zr_(2)Dy_(2)O_(7) 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.