Light-Driven Charge Redistribution of Pt Cluster/CeO₂ Realizing Dual-Path Synergistic Catalysis for Low-Temperature...

Area of Science:

• Catalysis
• Materials Science
• Renewable Energy

Background:

• Solar-driven low-temperature reverse water-gas shift (RWGS) is a sustainable CO2 conversion method.
• Current RWGS methods face challenges with efficiency and understanding reaction mechanisms.

Purpose of the Study:

• To demonstrate a novel Pt cluster/CeO2 catalyst for enhanced solar-driven CO2 conversion.
• To elucidate the reaction mechanisms under light irradiation.

Main Methods:

• Utilizing light as the sole energy source (2.27 W/cm2) to drive the reaction.
• Employing a continuous-flow system with cold inlet gases.
• Conducting mechanistic studies to understand light-induced catalytic processes.

Main Results:

• Achieved a localized catalyst temperature of ~309°C with only ~54°C reactor environment.
• Reached a CO production rate of 846.9 mmol gcat-1 h-1, surpassing thermal systems.
• Demonstrated comparable performance under natural sunlight at -21°C.

Conclusions:

• Light induces surface charge redistribution in the Pt/CeO2 catalyst, creating synergistic dual pathways.
• The light-driven Ptδ+-OV-Ce3+ structure enhances CO2 activation via carboxylate and formate routes.
• This approach offers a promising strategy for efficient solar energy conversion and CO2 utilization.