Photocatalytic Mechanisms in Tungsten Oxide Systems

The tungsten oxide system, particularly WO₃, has emerged as a robust n-type semiconductor photocatalyst with a bandgap of approximately 2.6–2.8 eV that can harness visible-light irradiation. Upon excitation, electrons are promoted from the valence band to the conduction band, generating holes that drive oxidation reactions while electrons participate in reduction processes. Intrinsic challenges—such as limited light-absorption range, rapid recombination of photogenerated charge carriers and moderate surface reaction kinetics—have motivated multiple enhancement strategies. Defect engineering, notably the introduction of oxygen vacancies, creates mid-gap states that broaden absorption and facilitate charge separation. Phase engineering, through the construction of orthorhombic-monoclinic junctions and facet control, engenders internal electric fields that steer charge flow and suppress recombination. Heterojunction formation, including direct Z-scheme architectures with complementary semiconductors, preserves strong oxidising holes and reducing electrons, thereby boosting hydrogen evolution, pollutant degradation and CO₂ photoreduction. Morphological tuning—from porous nanoframeworks to flower-like structures—further optimises surface area, light trapping and active sites. Together, these advances establish a coherent framework for maximising solar-to-chemical energy conversion in tungsten oxide systems, with broad implications for environmental remediation and sustainable fuel production.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Photocatalytic Mechanisms in Tungsten Oxide Systems publication trend

The graph below shows the total number of articles in photocatalytic mechanisms in tungsten oxide systems across all publications each year (not limited to Nature Index journals).

Technical terms

Bandgap: The energy difference between the valence band and conduction band of a semiconductor that determines its light-absorption threshold.

Oxygen vacancy: A missing oxygen atom in the crystal lattice that introduces defect states to enhance light absorption and charge separation.

Phase junction: An interface between two crystal structures of the same material that creates a built-in electric field to guide charge carriers.

Heterojunction: A junction between two different semiconductors that forms an energy barrier promoting directional transfer of electrons and holes.

Z-scheme: A photocatalytic architecture modelled on natural photosynthesis in which two semiconductors are arranged to preserve strong redox potentials by recombining lower-energy charge carriers.

References

1. Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting. Journal of Advanced Ceramics (2022).
2. Solid-state Z-scheme assisted hydrated tungsten trioxide/ZnIn 2 S 4 photocatalyst for efficient photocatalytic H 2 production. Materials Futures (2022).
3. A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation. Nanomaterials (2024).
4. Research Progress of Tungsten Oxide-Based Catalysts in Photocatalytic Reactions. Catalysts (2023).