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Enhancement of electrocatalytic oxygen reduction reaction on Au-Ag nanorings by plasmon excitation

Ring-shaped colloidal Au-Ag nanoparticles were successfully synthesized via galvanic replacement of Ag nanoplates as a template. The average size of Au-Ag nanorings was ca. 18 nm in diameter and its average width was ca. 4 nm. The thus-obtained nanorings showed a intense localized surface plasmon resonance (LSPR) peak at 680 nm. The Au-Ag nanorings exhibited an electrocatalytic activity for oxygen reduction reaction in an O2-saturated KOH aqueous solution at negative potential than +0.8 V vs. RHE, the activity being enhanced by the photoexcitation of LSPR.