Defect-Enriched ZnO/ZnS Heterostructures Derived from Hydrozincite Intermediates for Hydrogen Evolution under Visible...

Area of Science:

• Materials Science
• Photocatalysis
• Nanotechnology

Background:

• Defect engineering in ZnO/ZnS heterojunctions is crucial for improving visible light photocatalysis.
• Existing methods require optimization for enhanced performance and efficiency.

Purpose of the Study:

• To synthesize defect-enriched ZnO/ZnS heterostructures via a hydrozincite intermediate.
• To investigate the impact of engineered defects on photocatalytic activity and mechanism.

Main Methods:

• Hydrozincite intermediate-derived synthesis of ZnO/ZnS heterostructures.
• Characterization of defect states (Zn interstitials, Zn vacancies, S vacancies) using advanced techniques.
• Photocatalytic hydrogen evolution rate measurements under visible and simulated sunlight.

Main Results:

• Synthesized defect-enriched ZnO/ZnS exhibited enhanced visible light response.
• Achieved hydrogen evolution rates of 11.68 mmol h⁻¹ g⁻¹ (visible light) and 27.94 mmol h⁻¹ g⁻¹ (simulated sunlight).
• Identified ZnS as the primary reduction site and confirmed a Z-type mechanism.

Conclusions:

• Defect engineering in ZnO/ZnS heterostructures is a viable strategy for high-performance photocatalysis.
• The hydrozincite intermediate route offers a simple, low-cost method for producing active and stable photocatalysts.
• Further research into defect-mediated charge transfer can optimize photocatalytic applications.