Plasmonic semiconducting p-n junctions in a single nanoparticle for infrared light-driven efficient CO₂reduction

Area of Science:

• Materials Science
• Photocatalysis
• Nanotechnology

Background:

• Efficiently utilizing low-energy photons, like infrared light, for carbon dioxide (CO2) reduction is a significant challenge.
• Single-phase semiconductors suffer from charge recombination and energy loss issues in photocatalysis.
• Plasmonic semiconductors offer a potential solution to these limitations.

Purpose of the Study:

• To develop an efficient photocatalyst capable of harnessing near-infrared light for CO2 reduction.
• To investigate the performance of a plasmonic p-Cu7S4/n-CdS heterojunction for CO2 conversion.
• To demonstrate the potential of plasmonic semiconductors in practical photocatalytic applications.

Main Methods:

• Growth of a plasmonic p-Cu7S4/n-CdS heterojunction on a CdS nanoparticle via ion exchange.
• Testing the photocatalytic reduction of CO2 under near-infrared light irradiation.
• Utilizing a gas-solid configuration with CO2 and water vapor as the electron donor.

Main Results:

• The plasmonic p-Cu7S4/n-CdS heterojunction efficiently converts CO2 into CO, CH4, and C2H4 using only near-infrared light.
• Achieved a CO production rate of 86.4 μmol g-1 h-1 in a gas-solid system without sacrificial agents.
• Demonstrated a ~63-fold increase in CO production compared to Cu7S4 alone.

Conclusions:

• The developed plasmonic p-Cu7S4/n-CdS heterojunction is a highly effective infrared light-driven photocatalyst for CO2 reduction.
• This advancement represents a significant step towards practical applications of plasmonic semiconductors in sustainable energy.
• The study highlights the potential of heterojunction engineering in enhancing photocatalytic efficiency.