Tiox2/ZnO:TYPE-II Heterostructures for Electrochemical Crystal Violet Dye Degradation Studies

Abstract

Semiconductor nanomaterials with proper band edge alignments forming “heterostructure” assem-blies have significant importance in water splitting, dye degradation, and other electrochemical studies. The formed heterojunction between material phases facilitates fast charge carrier transport and, thereby, improves electrochemical performance in associated processes. Herein, we report a type-II heterostruc-ture combining TiOx2 and ZnO nanomaterials for electrochemical crystal violet dye degradation studies. The rationale in choosing the above materials (TiOx2, ZnO) in the present study includes stability, lack of toxicity, and high oxidation power, but they also facilitate fast charge carrier movements due to proper band edge alignments, forming a type-II heterostructure assembly. Cyclic voltammetry, combined with ultraviolet-visible analysis, was used to identify the cathodic and anodic peak currents and trace the exact mechanism of dye degradation. The electro-catalytic performance of TiOx2/ZnO heterostructured materials fabricated on titania (Ti) substrate show higher performance, in comparison to all individual material in-terfaces, due to synergistic interaction and synchronized charge transport.