m kheirmand - Department of chemistry, faculty of sciences, Yasouj university, Yasouj, Iran
f Rastegary-Fard - Department of chemistry, faculty of sciences, Yasouj university, Yasouj, Iran

In this paper the role of super paramagnetic iron oxide nanoparticles (SP1) on Platinum nanoclusters on activated carbon (Pt/ C) for electrocatalytic oxygen reduction reaction was considered. Four composites of Pt/ C and super para- magnetic iron oxide nanoparticles were prepared with the same total com- posites weight and different loading of Pt/C (1.2, 0.6, 0.4 and 0.3 mg ). The composite attached on a glassy carbon electrode via a thin layer of Nafion, Accepted that was made by Nafion solution . The electrochemical tests were carried out by using conventional three elec- trode system in sulfuric acid electrolyte at room temperature. Cyclic voltam- metry, linear sweep voltammetry, rotating disk electrode configuration and chronoamperometry results showed that by decreasing the Pt/ C loading, Elec- troactive surface area and oxygen diffusion coefficient decreased. Also by increasing the Fe304 nanoparticles in catalyst composite 2-electron pathway for ORR surpass from 4- electron pathway. Our results showed that in elec- trode with the same ratio of Pt/C and SP1 has the best utilization of Pt for oxygen reduction reaction.

Oxygen reduction reaction,Platinum,super paramagnetic iron oxide,proton exchange membrane fuel cell