Dual-Oxidative Co-Catalyst Synergy Regulating Charge Transport Cascade for Enhanced CO₂ Photocatalysis.

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Solar-driven photocatalytic conversion of carbon dioxide (CO₂) to hydrocarbons is crucial for carbon neutrality.
• Key challenges include photogenerated charge carrier recombination and slow charge transfer kinetics.
• Efficient artificial photosystems are needed to overcome these limitations.

Purpose of the Study:

• To develop an enhanced photocatalyst for CO₂ reduction using a novel synergistic dual-oxidative co-catalyst regulation strategy.
• To improve charge separation and transfer kinetics for efficient solar-to-fuel conversion.
• To establish a tunable charge transfer pathway for optimized photocatalytic activity.

Main Methods:

• Fabrication of a ternary artificial photosystem: CdIn₂S₄/CoSOH/LDH.
• Assembly of oxygen-containing cobalt sulfide (CoSOH) and layered double hydroxide (LDH) as dual hole-trapping mediators.
• Utilizing CoSOH as a charge transport relay and CoAl-LDH as a terminal hole reservoir.

Main Results:

• The CdIn₂S₄/CoSOH/LDH system demonstrated significantly enhanced photocatalytic CO₂ reduction activity.
• The synergistic dual-oxidative co-catalyst strategy effectively modulated charge transfer, accelerating hole migration.
• Improved charge separation and optimized surface reaction kinetics were observed, boosting solar-to-fuel efficiency.

Conclusions:

• The synergistic dual-oxidative co-catalyst regulation strategy provides an effective approach to enhance photocatalytic CO₂ reduction.
• The designed artificial photosystem exhibits a finely tuned spatial charge motion for efficient solar energy utilization.
• This work presents a paradigm for designing advanced photocatalysts for sustainable fuel production.