Tuning Electrocatalytic Activity of Gold Silver Nanoparticles on Reduced Graphene Oxide for Oxygen Reduction Reaction

Gold-silver (AuAg) nanoparticles were deposited on reduced graphene oxide (rGO), with Au wt% varying from 34.6 to 46.2 and Ag ranging 31.7 35.3. Three AuAg/rGO samples characterized by inductively coupled plasma optical emission spectroscopy, transmission scanning electron microscopy energy-dispersive X-ray diffraction analysis. Subsequently, materials studied using the rotating disk electrode as electrocatalysts for oxygen reduction reaction (ORR) potential application in alkaline fuel cells. AuAg/rGO-3 (with ca. 35.3 Ag) showed most promising performance, high ORR activity good stability, evidenced highest current density (−4.45 mA cm −2 at 0.5 V), lowest Tafel slope (103 mV dec −1 ), number of electrons exchanged (4.1).