Porous In₂O₃ Hollow Tube Infused with g-C₃N₄ for CO₂ Photocatalytic Reduction.

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Solar energy conversion of carbon dioxide (CO₂) into fuels is crucial for a carbon-neutral economy.
• Challenges remain in achieving affordable and efficient CO₂ conversion technologies.
• Developing advanced photocatalytic materials is key to overcoming these limitations.

Purpose of the Study:

• To design and synthesize a novel heterostructure for enhanced CO₂ conversion.
• To investigate the synergistic effects of polymeric graphitic carbon nitride (g-C₃N₄) and indium oxide (In₂O₃) in a hollow architecture.
• To evaluate the photocatalytic performance for CO₂ to CO conversion.

Main Methods:

• Integration of polymeric g-C₃N₄ within the pores of hollow In₂O₃ microtubes.
• Fabrication of a compact and staggered heterostructure with an increased interfacial contact area.
• Characterization of the material's structural, optical, and photocatalytic properties.

Main Results:

• The g-C₃N₄-In₂O₃ hollow tubes demonstrated superior CO₂ to CO conversion activity (274 μmol·g^-1·h^-1).
• This activity significantly outperformed pure In₂O₃ (5.5 μmol·g^-1·h^-1) and g-C₃N₄ (93.6 μmol·g^-1·h^-1).
• The hollow structure enhanced light absorption, and the heterojunction improved charge separation.

Conclusions:

• The integrated g-C₃N₄-In₂O₃ hollow heterostructure is highly effective for solar-driven CO₂ conversion.
• This architecture optimizes CO₂ adsorption and photocatalytic performance.
• The study presents a viable strategy for designing advanced semiconductor heterostructures for sustainable energy applications.