Co-Dissolved Isostructural Polyoxovanadates to Construct Single-Atom-Site Catalysts for Efficient CO₂ Photoreduction

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Developing efficient catalysts for CO2 photoreduction is crucial for mitigating climate change.
• Achieving high dispersion and utilization of precious metals like platinum is a key challenge in catalyst design.

Purpose of the Study:

• To develop a novel single-atom site catalyst for enhanced CO2 photoreduction.
• To investigate the synergistic effects of platinum and vanadium oxide in catalysis.
• To achieve high yield in methane production via CO2 conversion.

Main Methods:

• A co-dissolved strategy using [PtV9O28]7- and [V10O28]6- aqueous solutions.
• Freeze-drying to achieve uniform dispersion of platinum precursors.
• Calcination to convert vanadium species into V2O5 support and stabilize platinum.

Main Results:

• Successfully synthesized Pt-V2O5 single-atom-site catalysts with 100% platinum utilization.
• Achieved a methane yield of 247.6 μmol g-1 h-1, 25 times higher than Pt nanoparticle catalysts.
• Demonstrated the catalyst's effectiveness in lactic acid photooxidation to pyruvic acid.

Conclusions:

• The developed co-dissolved strategy effectively prevents platinum agglomeration, leading to highly dispersed single-atom sites.
• Pt-O atomic pair synergy plays a critical role in the high efficiency of CO2 photoreduction.
• The Pt-V2O5 single-atom catalyst shows significant potential for CO2 conversion applications.