Floatable artificial leaf to couple oxygen-tolerant CO₂ conversion with water purification

Area of Science:

• Materials Science
• Photocatalysis
• Environmental Chemistry

Background:

• Artificial photosynthesis requires efficient CO2 utilization in open environments.
• Oxygen-tolerant reductive procedures are crucial for practical applications.
• Developing stable and efficient photocatalysts for CO2 reduction remains a challenge.

Purpose of the Study:

• To develop a two-dimensional heterojunction photocatalyst for direct CO2 utilization.
• To engineer an oxygen-tolerant system for photocatalytic CO2 reduction.
• To create a floatable artificial leaf device for simultaneous water purification and CO2 conversion.

Main Methods:

• In situ growth of indium porphyrin metal-organic framework (In-MOF) and graphene oxide (GO) heterojunctions.
• Fabrication of a floatable artificial leaf using a porous polytetrafluoroethylene (PTFE) membrane.
• Testing the photocatalytic performance in a triphase reaction system under illumination.

Main Results:

• The In-MOF/GO heterostructure demonstrated efficient tandem CO2 capture and photocatalytic reduction.
• The system effectively reduced dilute CO2 in the presence of air-level O2.
• The floatable artificial leaf successfully removed aqueous contaminants and reduced CO2 from real water.

Conclusions:

• The developed In-MOF/GO heterojunction is a promising photocatalyst for CO2 conversion.
• The floatable artificial leaf offers a scalable and practical approach for environmental applications.
• This technology enables CO2 utilization in open environments, addressing key challenges in artificial photosynthesis.