Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Area of Science:

• Materials Science
• Electrochemistry
• Quantum Mechanics

Background:

• Developing efficient electrocatalysts for CO2 reduction is crucial for a carbon-neutral energy cycle.
• Improving selectivity towards CO2 reduction over hydrogen evolution is a key challenge.

Purpose of the Study:

• To investigate the effect of space confinement in nanoparticle gaps on CO2 reduction reaction (CO2RR) selectivity.
• To understand the mechanism by which space confinement influences key reaction intermediates.

Main Methods:

• Utilized quantum mechanics calculations to model the electronic and energetic properties of intermediates.
• Simulated the effects of space confinement between adjacent gold and silver nanoparticles.

Main Results:

• Demonstrated that space confinement significantly stabilizes the *COOH intermediate, key to CO2RR.
• Showed that space confinement has minimal impact on the *H intermediate, key to HER.
• Observed enhanced Faradaic efficiency for CO2RR to CO due to space confinement.

Conclusions:

• Space confinement in nanoparticle gaps is a promising strategy to enhance CO2RR efficiency.
• Proposed potential experimental methods for fabricating such nanoparticle electrocatalysts.
• This work provides a theoretical basis for designing advanced electrocatalysts for CO2 utilization.