Engineering a 1D/1D WO₃/FeWO₄ S-scheme heterostructure for enhanced photocatalytic hydrogen evolution

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Efficient solar-driven hydrogen production is crucial for sustainable energy.
• Maximizing charge carrier separation and redox potential is a key challenge.
• WO3 and FeWO4 are explored for photocatalytic applications.

Purpose of the Study:

• To synthesize and characterize a novel 1D/1D WO3/FeWO4 S-scheme heterostructure.
• To investigate its efficiency for photocatalytic hydrogen production.
• To understand the charge transfer mechanism.

Main Methods:

• Facile two-step hydrothermal synthesis of WO3/FeWO4 heterostructures.
• Morphological characterization using electron microscopy.
• Photocatalytic hydrogen evolution rate measurements.
• Density functional theory (DFT) calculations and surface analysis.

Main Results:

• The WO3/FeWO4 heterostructure exhibited a hydrogen evolution rate of 1602 µmol g-1 h-1.
• This represents a 3.6-fold enhancement compared to pristine FeWO4.
• Pristine WO3 showed negligible activity.
• DFT calculations indicated an internal electric field facilitating S-scheme charge transfer.

Conclusions:

• The 1D/1D WO3/FeWO4 S-scheme heterostructure demonstrates high efficiency in solar hydrogen production.
• Dimensional engineering and interfacial electric field modulation are effective strategies for designing advanced photocatalysts.
• This approach offers a viable pathway for sustainable hydrogen generation.