Elaheh Lohrasbi - Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
Mehran Javanbakht - Department of Chemistry, Amirkabir University of Technology, Tehran, Iran- Fuel and Solar cell Lab, Renewable Energy Research Center, Amirkabir University of Technology, Tehran, Iran
Sayed Ahmad Mozaffari - Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

This paper reports the synthesis of platinum-iron-cobalt alloy nanoparticles dispersed on graphene nanosheets. The particles had large electrochemical surface area. The synthesized electrocatalyst were used in the cathode of a proton membrane exchange fuel cell, in which the maximum power density is 330 mW cm-2 with 0.1 mg cm-2 Pt loading. Electrocatalyst were prepared via the reduction of precursors in the presence of glycerol as stabilizer. The electrocatalytic performances of the synthesized PtFeCo/Gr alloy electrocatalysts were compared with that of PtFeCo/Gr electrocatalyst which prepared in the absence of glycerol. Physical property studies (SEM, TEM micrographs) and electrochemical analyses with catalyst layers immobilized on glassy carbon electrodes (cyclic voltammetry) were carried out to characterize the structural and electrochemical behavior of the synthesized electrocatalyst. Finally, a cell performance investigation, using the synthesized electrocatalyst was carried out in a single PEMFC setup.The electrocatalytic performances of the synthesized electrocatalysts were compared with Pt/Gr by cyclic voltammetry; among these electroctalysts, the catalyst which was prepared in the presence of glycerol as stabilizer exhibits the highest activity and the best stability for oxygen reduction reaction (ORR) in acidic media.

Graphene, Pt alloy, catalyst, PtFeCo, PEMFC, Oxygen reduction reaction