High-Performance H₂ Photosynthesis from Pure Water over Ru-S Charge Transfer Channels

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Hydrogen (H2) is a promising clean energy carrier, but efficient production via photocatalytic water splitting without sacrificial reagents is challenging.
• Developing effective catalysts is crucial for solar-driven hydrogen generation to address energy and environmental issues.

Purpose of the Study:

• To enhance solar-driven photocatalytic hydrogen production using pure water.
• To investigate the effect of incorporating Ruthenium (Ru) single atoms (SAs) into Zinc Indium Sulfide (ZnIn2S4) for improved photocatalytic activity.

Main Methods:

• Synthesized Ruthenium single atoms incorporated into ZnIn2S4 (Ru-ZIS) photocatalyst.
• Evaluated photocatalytic hydrogen production under visible light irradiation without sacrificial agents.
• Measured hydrogen evolution rate, apparent quantum efficiency (AQE), and solar-to-hydrogen (STH) efficiency.
• Assessed catalyst stability over 330 days under ambient conditions.

Main Results:

• Ru-ZIS demonstrated enhanced light absorption and reduced energy barriers for water dissociation.
• A Ru-S channel facilitated the separation of photogenerated electron-hole pairs, boosting photocatalytic activity.
• Achieved a hydrogen production rate of 735.2 μmol g⁻¹ h⁻¹.
• Attained an AQE of 7.5% at 420 nm and an STH efficiency of 0.58%.
• Ru-ZIS exhibited remarkable stability, maintaining steady hydrogen productivity for 330 days.

Conclusions:

• Incorporating Ru single atoms into ZnIn2S4 is an effective strategy for enhancing photocatalytic hydrogen production.
• The Ru-S channel plays a key role in charge separation, leading to significantly improved efficiency.
• This work offers a novel approach for catalyst design in photocatalysis and provides a stable, efficient method for clean hydrogen generation.