3D Interwoven SiC/g-C₃N₄ Structure for Superior Charge Separation and CO₂ Photoreduction Performance.

Area of Science:

• Materials Science
• Catalysis
• Environmental Science

Background:

• Graphitic carbon nitride (g-C3N4) shows promise in photocatalysis but faces limitations.
• Developing efficient and stable photocatalysts is crucial for CO2 reduction.

Purpose of the Study:

• To overcome the limitations of g-C3N4 by creating a 3D interwoven SiC/g-C3N4 composite structure.
• To enhance the photocatalytic performance for CO2 reduction.

Main Methods:

• Utilized microwave-thermal conversion of SiC whiskers to generate localized "hot spots".
• Promoted rapid polymerization of urea and in situ formation of an interwoven network.
• Fabricated a 3D interwoven SiC/g-C3N4 composite catalyst.

Main Results:

• The unique structure enhanced interfacial interactions and created efficient electron transport pathways.
• Improved CO2 adsorption, charge separation, and reduced carrier recombination.
• Achieved a CO generation rate of 17.78 μmol g-1h-1 with 93.28% selectivity, three times higher than pure g-C3N4.

Conclusions:

• The 3D interwoven SiC/g-C3N4 composite demonstrates superior performance in CO2 photocatalytic reduction.
• Innovative strategies for designing multiscale structures can significantly enhance catalyst efficiency.
• The findings contribute to developing sustainable catalysts for energy and environmental applications.