Plasmonic Silver Modification on Bi₅O₇I Microflowers toward Boosted CO₂ Photoreduction.

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Carbon dioxide (CO2) conversion is crucial for mitigating climate change and addressing energy demands.
• Developing efficient photocatalysts for CO2 reduction faces challenges like poor light absorption and charge carrier recombination.
• Existing catalysts often require sacrificial agents, limiting practical applications.

Purpose of the Study:

• To develop a highly efficient photocatalyst for CO2 reduction.
• To enhance light absorption and charge carrier separation in photocatalytic systems.
• To investigate the mechanism behind improved CO2 photoreduction performance.

Main Methods:

• Synthesis of plasmonic silver-deposited Bi5O7I photocatalyst using wet chemical and solid-state reaction methods.
• Photocatalytic CO2 reduction experiments under simulated solar light without sacrificial agents.
• Mechanism analysis involving localized surface plasmon resonance and metal/semiconductor junction effects.

Main Results:

• Achieved a high CO evolution rate of 23.01 μmol g−1 h−1.
• Demonstrated enhanced visible light absorption due to the plasmonic effect.
• Facilitated efficient separation of photogenerated carriers and improved adsorption of reaction intermediates.
• Showcased superior photocatalytic CO2 reduction (PCR) activity.

Conclusions:

• Plasmonic silver deposition on Bi5O7I significantly enhances CO2 photoreduction.
• The metal/semiconductor junction and plasmon resonance effect are key to improved performance.
• This strategy offers a promising approach for efficient solar fuel production.