Recent Advances in Photocatalytic Systems and Selectivity Control Mechanisms

Area of Science:

• Catalysis
• Renewable Energy
• Materials Science

Background:

• Fossil fuel overuse drives urgent need for renewable energy solutions.
• Photocatalysis offers a promising route for converting solar energy into chemical energy, particularly for biomass valorization.
• Glucose oxidation is a key process for producing high-value chemicals from biomass.

Purpose of the Study:

• To systematically review recent advancements in photocatalytic glucose oxidation.
• To focus on catalyst design strategies and mechanisms for controlling selectivity.
• To explore the potential of photocatalysis in sustainable biomass refining.

Main Methods:

• Summarizing research on metal-based (TiO2, ZnO, SnO2), carbon nitride (g-C3N4), and composite photocatalysts.
• Analyzing catalyst design strategies including crystallographic phase engineering, noble metal modification, and defect engineering.
• Investigating mechanisms like ligand-to-metal charge transfer, Schottky junctions, and single-atom catalysis.

Main Results:

• Pt/TiO2 achieved 84.3% selectivity for glucaric acid via oxygen vacancy mediation.
• Au/ZnO boosted lactic acid selectivity to 38% by reducing the C2-C3 cleavage barrier.
• Oxygen-doped ultrathin g-C3N4 yielded 89.7% lactic acid via superoxide radical pathways.
• Composite ZnxCdxS systems achieved 87% selectivity for lactic acid and H2 evolution through phase-boundary engineering.

Conclusions:

• Photocatalytic glucose oxidation shows significant progress with engineered catalysts.
• Understanding reaction mechanisms is crucial for optimizing selectivity and efficiency.
• Further development is needed for scalability and energy efficiency in sustainable biomass refining.