electrochemical energy conversion realized through ag@pt/rgo nano-catalyst enhancing activity of the orr process in a pemfc

Core-shell structures of ag@pt nanoparticles (nps) dispersed upon reduced graphene oxide (rgo) support containing different ag:pt mass ratios synthesized through the ultrasonic treatment method. these applied to the oxygen reduction reaction (orr) process in a proton exchange membrane fuel cell (pemfc). the morphology of as-prepared catalysts characterized through high resolution transmission electron microscopy (hrtem), x-ray diffraction (xrd) and induced coupled plasma atomic emission spectroscopy (icp-oes) analyses. the orr activities and stabilities of catalysts studied through electrochemical measurements of cyclic voltammetry (cv) and single cell tests, respectively. the results revealed, prepared ag@pt/rgo catalysts possessed a core-shell nanostructure and the one with the ag:pt mass ratio of 1:3 displayed the largest electrochemical surface area (of 77.6 m² g^-1) as well as; provided the highest stability compared with prepared electrodes containing other ag:pt ratios and the obtained commercial pt/c material. the maximum power density for the mea prepared with this electrocatalyst determined to be 55% higher than that of the commercial pt/c evaluated through single cell techniques. thus, the understudied material seemed to be a very promising cathode for utilizing in pem fuel cells.