Transformation of CeO2 into a mixed phase CeO2/Ce2O3 nanohybrid by liquid phase pulsed laser ablation for enhanced photocatalytic activity through Z-scheme pattern

Abstract

Cerium-based nanohybrids have attracted considerable attention in photocatalytic research owing to their remarkable potential in the photodegradation of environmental pollutants. However, the process of nanohybrid formation suffers from complex operations with specialized equipment, extreme conditions, long durations, and low yields, making it infeasible for efficient utilization. Considering the above obstacles, we herein describe the first pulsed laser ablation (PLA) for the synthesis of oxygen vacancy affluent CeO2/Ce2O3 nanohybrids, as an alternative to hydrothermal and calcination methods. The microstructures and optical properties of the nanocomposites are characterized by TEM, XRD, XPS, and DRS analysis. The photocatalytic activity of the CeO2/Ce2O3 nanohybrid showed an MB dye degradation rate superior to that of bare CeO2 nanostructures. The enhanced performance of CeO2/Ce2O3 was attributed to an oxygen-vacancy-driven Z-scheme mechanism, where efficient separation of the photogenerated charge carriers significantly contributed to photocatalytic enhancement. This was further evidenced by both PL and scavenger experiment results. Moreover, the synthesized CeO2/Ce2O3 nanocomposites exhibit a strong blue emission, which could have potential applications in LED manufacturing. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.