Accès ouvert

The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce)

Article scientifique 2022 Anglais

Résumé

Abstract A great effort has been done to improve the efficiency of materials for photo-catalytic water splitting application. The most famous catalysis is TiO2, but its band gap, exceeds 3.0 eV, doesn’t fit into the visible spectrum. so, to exploit this range of energy, we are looking for other materials having band gap lower that 2.0 eV. The research focused on the enhancement of photo-catalysis by modification of TiO2 by means of metal loading, metal ion doping, …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 compound having absorption in UV. The quantum efficiency of Zr2Dy2O7 reaches up to 3%, and the limit of conduction band and valence band are localized in potential redox zone. Doping with Cerium gives another energy level which allows to have other optical transitions, improve the absorption and reach the quantum efficiency to 4% in a visible range.

Citer ce document

Zaari, H., ouassoul, k., Mezzat, F., Yahyaoui, F., kenz, a., abilah, b. (2022). The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce). https://doi.org/10.21203/rs.3.rs-1358592/v1

Accès au document

Voir sur le dépôt source

Ce document est hébergé sur son dépôt institutionnel d'origine.

Auteur(s)

H. Zaari khawla ouassoul F. Mezzat F. El Yahyaoui abedllah kenz benyoussef abilah

Statistiques

Consultations : 1

Téléchargements : 0