Assisting a Type-II Heterojunction with the LSPR Effect for Realizing Photocatalytic Hydrogen Peroxide Evolution with...

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Conventional type-II heterojunction catalysts for hydrogen peroxide production face limitations in redox ability and charge carrier utilization.
• Artificial photosynthesis requires efficient catalysts for sustainable chemical production.

Purpose of the Study:

• To develop a novel catalyst system that overcomes the limitations of traditional type-II heterojunctions for hydrogen peroxide production.
• To enhance the utilization of charge carriers and improve the overall efficiency of artificial photosynthesis.

Main Methods:

• Fabrication of a composite catalyst integrating type-II heterojunctions with localized surface plasmon resonance (LSPR) effect.
• Utilizing the hot electron injection process for cooperative enhancement of high-energy electron utilization.
• Characterization of the catalyst's performance under simulated solar irradiation (AM1.5G, 100 mW cm⁻²).

Main Results:

• The optimized MoO_3-x-ZnIn₂S₄ (VMZS) catalyst achieved a hydrogen peroxide production rate of 47.2 μmol g⁻¹ min⁻¹.
• The catalyst demonstrated a significant apparent quantum efficiency of 0.5% at 940 nm.
• A prepared film of VMZS exhibited a hydrogen peroxide production rate of 338.1 μM h⁻¹.

Conclusions:

• The synergistic combination of type-II heterojunctions and LSPR effect offers a promising strategy for designing efficient catalysts.
• This approach significantly enhances hydrogen peroxide production for artificial photosynthesis applications.
• The study provides new insights into catalyst design by leveraging cooperative carrier transfer and LSPR effects.