Spatial Specific Janus S-Scheme Photocatalyst with Enhanced H₂ O₂ Production Performance.

Area of Science:

• Materials Science
• Catalysis
• Green Chemistry

Background:

• Photocatalytic oxygen reduction reaction (ORR) is crucial for sustainable H₂ O₂ production.
• Designing high-performance photocatalysts is key for efficient green synthesis.
• Sacrificing agents are often required, limiting environmental friendliness.

Purpose of the Study:

• To design a novel photocatalyst with enhanced performance for H₂ O₂ production.
• To investigate a spatial specific S-scheme heterojunction in a Janus core-shell hollow morphology.
• To achieve green H₂ O₂ synthesis without sacrificing agents.

Main Methods:

• Fabrication of TiO₂ nanocrystals within resorcinol-formaldehyde (RF) resin hollow nanocakes (TiO₂ @RF).
• Construction of an S-scheme heterojunction to maintain high redox potentials.
• Utilizing a Janus core-shell structure for improved charge separation and active site exposure.

Main Results:

• The TiO₂ @RF photocatalyst achieved a high H₂ O₂ yield of 66.6 mM g^-1 h^-1.
• A solar-to-chemical conversion efficiency of 1.11% was recorded.
• The Janus design minimized H₂ O₂ decomposition and outperformed reversed structures.

Conclusions:

• The developed TiO₂ @RF photocatalyst demonstrates superior performance for green H₂ O₂ production.
• Spatial specific S-scheme heterojunctions in Janus structures are effective for photocatalysis.
• This work provides a pathway for designing next-generation photocatalysts for sustainable chemical synthesis.