Bismuth-Based Oxyfluorides as Emergent Photocatalysts: A Review

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Bismuth-based oxyfluorides (BiOxF3-2x) are emerging as advanced photocatalysts.
• Their unique electronic structures and tunable properties drive photocatalytic applications.

Purpose of the Study:

• To provide a comprehensive review of bismuth oxyfluorides.
• To highlight crystal structures, band gaps, and photocatalytic performance.
• To discuss structural modifications and synthesis strategies.

Main Methods:

• Review of existing literature on bismuth oxyfluorides.
• Analysis of crystal structures, band gap characteristics, and photocatalytic performance.
• Exploration of synthesis techniques and heterojunction engineering.

Main Results:

• Specific materials like BiOF, Bi7O5F11, and β-BiOxF3-2x show promise.
• Fluorine's electronegativity and internal electric fields impact charge separation.
• Structural modifications and heterojunctions improve light harvesting and reduce recombination.

Conclusions:

• Bismuth oxyfluorides are versatile for pollutant degradation and CO2 photoconversion.
• Challenges in phase identification and composition control require further research.
• Optimization strategies are needed to enhance photocatalytic activity.