Wide‐bandgap HfO₂‐V₂O₅ nanowires heterostructure for visible light‐driven photocatalytic degradation

Abstract

A novel HfO2/V2O5 nanocomposite has been fabricated for use as photocatalyst. HfO2 nanoparticles (NPs) were deposited on V2O5 using a precipitation method. Both commercial V2O5 particles and microwave‐assisted hydrothermal (MAH)‐synthesized V2O5 nanowires (NWs) were used. We demonstrate that the HfO2/V2O5 nanocomposite exhibits better photodegradation efficiency than the V2O5. The photodegradation reaction constant of the HfO2/V2O5 nanocomposite is more than 66% higher than that of the V2O5. The wide‐bandgap, transparent HfO2 effectively reduces the electron‐hole recombination by proving defect levels to quench the recombination. A plausible band structure is proposed to support the existence of these defect levels.

Photocatalytic Methane Reforming: Recent Advances

“…One important point relating to the band structure criteria is that the reduction potential of O 2 is less positive compared to CO 2 or H 2 O. Therefore, semiconductors with a relatively low conduction band position, such as WO 3 , V 2 O 5 , BiVO 4 , or Bi 2 WO 6 , were used in these stud-ies [54][55][56][57][58][59]. It is noted that Bi 2 WO 6 has no significant activity in the case of photocatalytic DRM, probably because of the insufficient conduction band potential [22].…”

Assessment of the Morphological, Optical, and Photoluminescence Properties of HfO2 Nanoparticles Synthesized by a Sol–Gel Method Assisted by Microwave Irradiation

“…In this work, the authors indicated that the absence of luminescence led to a decrease in the scintillation light yield. Another application that benefits from the presence of oxygen vacancies concerns the photocatalytic degradation using inorganic NP heterostructures (HfO 2 –V 2 O 5 ; HfO 2 /TiO 2 ). , …”

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

“…The reason may be that the substitution of resident O atoms within the NaTaO 3 lattice by sulfur atoms induced the local states just above the valence level as the new hybridized orbitals were formed [12,40]. Aside from the bandgap width, the photocatalytic degradation activity of a sample highly depended on the recombination of electron (e − )-hole (h + ) pairs [12,[41][42][43][44]. Under photo-irradiation, the photo-induced e−/h+ pairs on the CB/VB of each semiconductor were created.…”