Nano-Impact Single-Entity Electrochemistry Enables Plasmon-Enhanced Electrocatalysis

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Plasmon-enhanced electrocatalysis (PEEC) combines localized surface plasmon resonance with electrochemical bias for improved energy conversion.
• Conventional electrocatalysis methods often mask the true catalytic activity of plasmonic materials.

Purpose of the Study:

• To investigate the intrinsic activity of plasmonic catalysts at the single-particle level using nano-impact single-entity electrochemistry (SEE).
• To compare the effectiveness of SEE with conventional ensemble measurements for studying PEEC.

Main Methods:

• Utilized nano-impact single-entity electrochemistry (SEE) with gold nanoparticles as model catalysts.
• Investigated glucose electrooxidation and oxygen reduction reactions.
• Compared SEE results with conventional ensemble electrochemical measurements.

Main Results:

• Ensemble measurements showed minimal impact of plasmonic effects on photocurrents, attributed to Fermi level equilibration and hot carrier neutralization.
• Photocurrents in ensemble measurements were primarily due to photo-induced heating.
• SEE demonstrated that plasmonic effects are the dominant source of photocurrents when the Fermi level of nanoparticles is not influenced by the electrode.

Conclusions:

• Single-entity electrochemistry (SEE) is crucial for accurately assessing the intrinsic activity of plasmonic catalysts in PEEC.
• Conventional ensemble methods can obscure the significant contributions of plasmonic effects.
• SEE enables a clearer understanding of plasmonic enhancement mechanisms in electrocatalysis.